Preface |
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xix | |
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1 Introduction and Conservation Equations |
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1 | (42) |
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1.1 Why Is Turbulent and Multiphase Combustion Important? |
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3 | (1) |
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1.2 Different Applications for Turbulent and Multiphase Combustion |
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3 | (5) |
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1.2.1 Applications in High Rates of Combustion of Materials for Propulsion Systems |
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5 | (2) |
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1.2.2 Applications in Power Generation |
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7 | (1) |
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1.2.3 Applications in Process Industry |
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7 | (1) |
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1.2.4 Applications in Household and Industrial Heating |
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7 | (1) |
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1.2.5 Applications in Safety Protections for Unwanted Combustion |
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7 | (1) |
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1.2.6 Applications in Ignition of Various Combustible Materials |
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8 | (1) |
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1.2.7 Applications in Emission Control of Combustion Products |
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8 | (1) |
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1.2.8 Applications in Active Control of Combustion Processes |
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8 | (1) |
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1.3 Objectives of Combustion Modeling |
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8 | (1) |
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1.4 Combustion-Related Constituent Disciplines |
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9 | (1) |
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1.5 General Approach for Solving Combustion Problems |
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9 | (2) |
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1.6 Governing Equations for Combustion Models |
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11 | (3) |
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1.6.1 Conservation Equations |
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11 | (1) |
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1.6.2 Transport Equations |
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11 | (1) |
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1.6.3 Common Assumptions Made in Combustion Models |
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11 | (1) |
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12 | (1) |
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1.6.4.1 High-Pressure Correction |
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13 | (1) |
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1.7 Definitions of Concentrations |
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14 | (2) |
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1.8 Definitions of Energy and Enthalpy Forms |
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16 | (3) |
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1.9 Velocities of Chemical Species |
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19 | (4) |
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1.9.1 Definitions of Absolute and Relative Mass and Molar Fluxes |
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20 | (3) |
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1.10 Dimensionless Numbers |
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23 | (1) |
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1.11 Derivation of Species Mass Conservation Equation and Continuity Equation for Multicomponent Mixtures |
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23 | (6) |
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1.12 Momentum Conservation Equation for Mixture |
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29 | (4) |
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1.13 Energy Conservation Equation for Multicomponent Mixture |
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33 | (7) |
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1.14 Total Unknowns versus Governing Equations |
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40 | (3) |
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41 | (2) |
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2 Laminar Premixed Flames |
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43 | (82) |
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2.1 Basic Structure of One-Dimensional Premixed Laminar Flames |
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46 | (1) |
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2.2 Conservation Equations for One-Dimensional Premixed Laminar Flames |
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47 | (21) |
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2.2.1 Various Models for Diffusion Velocities |
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49 | (1) |
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2.2.1.1 Multicomponent Diffusion Velocities (First-Order Approximation) |
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49 | (5) |
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2.2.1.2 Various Models for Describing Source Terms due to Chemical Reactions |
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54 | (12) |
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2.2.2 Sensitivity Analysis |
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66 | (2) |
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2.3 Analytical Relationships for Premixed Laminar Flames with a Global Reaction |
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68 | (18) |
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2.3.1 Three Analysis Procedures for Premixed Laminar Flames |
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77 | (3) |
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2.3.2 Generalized Expression for Laminar Flame Speeds |
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80 | (1) |
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2.3.2.1 Reduced Reaction Mechanism for HC-Air Flame |
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81 | (1) |
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2.3.3 Dependency of Laminar Flame Speed on Temperature and Pressure |
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82 | (2) |
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2.3.4 Premixed Laminar Flame Thickness |
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84 | (2) |
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2.4 Effect of Flame Stretch on Laminar Flame Speed |
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86 | (17) |
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2.4.1 Definitions of Stretch Factor and Karlovitz Number |
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86 | (8) |
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2.4.2 Governing Equation for Premixed Laminar Flame Surface Area |
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94 | (1) |
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2.4.3 Determination of Unstretched Premixed Laminar Flame Speeds and Markstein Lengths |
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95 | (8) |
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2.5 Modeling of Soot Formation in Laminar Premixed Flames |
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103 | (22) |
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2.5.1 Reaction Mechanisms for Soot Formation and Oxidation |
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104 | (2) |
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2.5.1.1 Empirical Models for Soot Formation |
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106 | (2) |
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2.5.1.2 Detailed Models for Soot Formation and Oxidation |
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108 | (1) |
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2.5.1.3 Formation of Aromatics |
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109 | (1) |
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2.5.1.4 Growth of Aromatics |
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110 | (2) |
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2.5.1.5 Migration Reactions |
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112 | (1) |
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2.5.1.6 Oxidation of Aromatics |
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113 | (1) |
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2.5.2 Mathematical Formulation of Soot Formation Model |
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114 | (10) |
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124 | (1) |
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3 Laminar Non-Premixed Flames |
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125 | (81) |
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3.1 Basic Structure of Non-Premixed Laminar Flames |
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128 | (1) |
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129 | (1) |
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3.3 Mixture Fraction Definition and Examples |
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130 | (12) |
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3.3.1 Balance Equations for Element Mass Fractions |
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134 | (4) |
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3.3.2 Temperature-Mixture Fraction Relationship |
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138 | (4) |
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3.4 Flamelet Structure of a Diffusion Flame |
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142 | (9) |
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3.4.1 Physical Significance of the Instantaneous Scalar Dissipation Rate |
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145 | (2) |
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3.4.2 Steady-State Combustion and Critical Scalar Dissipation Rate |
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147 | (4) |
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3.5 Time and Length Scales in Diffusion Flames |
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151 | (2) |
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3.6 Examples of Laminar Diffusion Flames |
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153 | (19) |
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3.6.1 Unsteady Mixing Layer |
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153 | (2) |
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3.6.2 Counterflow Diffusion Flames |
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155 | (10) |
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3.6.3 Coflow Diffusion Flame or Jet Flames |
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165 | (7) |
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3.7 Soot Formation in Laminar Diffusion Flames |
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172 | (34) |
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3.7.1 Soot Formation Model |
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173 | (1) |
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3.7.1.1 Particle Inception |
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174 | (1) |
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3.7.1.2 Surface Growth and Oxidation |
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174 | (1) |
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175 | (1) |
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3.7.3 Experimental Studies by Using Coflow Burners |
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176 | (2) |
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178 | (4) |
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3.7.3.2 Effect of Fuel Structure |
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182 | (1) |
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3.7.3.3 Influence of Additives |
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183 | (3) |
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3.7.3.4 Coflow Ethylene/Air Laminar Diffusion Flames |
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186 | (5) |
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3.7.3.5 Modeling of Soot Formation |
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191 | (13) |
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204 | (2) |
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4 Background in Turbulent Flows |
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206 | (77) |
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4.1 Characteristics of Turbulent Flows |
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210 | (3) |
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212 | (1) |
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4.2 Statistical Understanding of Turbulence |
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213 | (4) |
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214 | (1) |
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215 | (1) |
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215 | (1) |
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4.2.4 Statistical Moments |
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215 | (1) |
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4.2.5 Homogeneous Turbulence |
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216 | (1) |
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4.2.6 Isotropic Turbulence |
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217 | (1) |
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4.3 Conventional Averaging Methods |
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217 | (30) |
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218 | (4) |
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4.3.1.1 Correlation Functions |
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222 | (3) |
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225 | (2) |
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4.3.3 Relation between Time Averaged-Quantities and Mass-Weighted Averaged Quantities |
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227 | (1) |
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4.3.4 Mass-Weighted Conservation and Transport Equations |
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228 | (1) |
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4.3.4.1 Continuity and Momentum Equations |
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228 | (2) |
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230 | (1) |
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4.3.4.3 Mean Kinetic Energy Equation |
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231 | (1) |
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4.3.4.4 Reynolds-Stress Transport Equations |
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232 | (2) |
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4.3.4.5 Turbulence-Kinetic-Energy Equation |
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234 | (2) |
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4.3.4.6 Turbulent Dissipation Rate Equation |
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236 | (6) |
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4.3.4.7 Species Mass Conservation Equation |
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242 | (1) |
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243 | (3) |
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4.3.6 Relationship between Enstrophy and the Turbulent Dissipation Rate |
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246 | (1) |
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247 | (2) |
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4.5 Probability Density Function |
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249 | (7) |
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4.5.1 Distribution Function |
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250 | (2) |
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4.5.2 Joint Probability Density Function |
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252 | (2) |
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254 | (2) |
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256 | (10) |
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4.6.1 Comment on Kolmogorov Hypotheses |
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260 | (6) |
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4.7 Large Eddy Simulation |
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266 | (13) |
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268 | (2) |
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4.7.2 Filtered Momentum Equations and Subgrid Scale Stresses |
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270 | (4) |
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4.7.3 Modeling of Subgrid-Scale Stress Tensors |
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274 | (5) |
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4.8 Direct Numerical Simulation |
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279 | (4) |
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280 | (3) |
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5 Turbulent Premixed Flames |
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283 | (119) |
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5.1 Physical Interpretation |
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289 | (2) |
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5.2 Some Early Studies in Correlation Development |
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291 | (13) |
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5.2.1 Damkohler's Analysis (1940) |
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292 | (3) |
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5.2.2 Schelkin's Analysis (1943) |
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295 | (1) |
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5.2.3 Karlovitz, Denniston, and Wells's Analysis (1951) |
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296 | (1) |
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5.2.4 Summerfield's Analysis (1955) |
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297 | (1) |
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5.2.5 Kovasznay's Characteristic Time Approach (1956) |
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298 | (1) |
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5.2.6 Limitations of the Preceding Approaches |
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299 | (5) |
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5.3 Characteristic Scale of Wrinkles in Turbulent Premixed Flames |
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304 | (6) |
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5.3.1 Schlieren Photographs |
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305 | (1) |
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5.3.2 Observations on the Structure of Wrinkled Laminar Flames |
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305 | (2) |
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5.3.3 Measurements of Scales of Unburned and Burned Gas Lumps |
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307 | (3) |
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5.3.4 Length Scale of Wrinkles |
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310 | (1) |
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5.4 Development of Borghi Diagram for Premixed Turbulent Flames |
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310 | (14) |
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5.4.1 Physical Interpretation of Various Regimes in Borghi's Diagram |
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311 | (1) |
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5.4.1.1 Wrinkled Flame Regime |
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311 | (1) |
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5.4.1.2 Wrinkled Flame with Pockets Regime (also Called Corrugated Flame Regime) |
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311 | (2) |
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5.4.1.3 Thickened Wrinkled Flames |
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313 | (1) |
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5.4.1.4 Thickened Flames with Possible Extinctions/Thick Flames |
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314 | (1) |
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5.4.2 Klimov-Williams Criterion |
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314 | (2) |
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5.4.3 Construction of Borghi Diagram |
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316 | (2) |
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5.4.3.1 Thick Flames (or Distributed Reaction Zone or Well-Stirred Reaction Zone) |
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318 | (1) |
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318 | (2) |
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5.4.4.1 Wrinkled Flamelets (Weak Turbulence) |
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320 | (2) |
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5.4.4.2 Corrugated Flamelets (Strong Turbulence) |
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322 | (2) |
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5.5 Measurements in Premixed Turbulent Flames |
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324 | (1) |
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324 | (13) |
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5.6.1 Spalding's EBU Model |
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335 | (1) |
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5.6.2 Magnussen and Hjertager's EBU Model |
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336 | (1) |
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337 | (2) |
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5.8 Flame-Turbulence Interaction |
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339 | (3) |
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5.8.1 Effects of Flame on Turbulence |
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341 | (1) |
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5.9 Bray-Moss-Libby Model |
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342 | (26) |
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5.9.1 Governing Equations |
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349 | (4) |
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353 | (1) |
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5.9.3 Countergradient Transport |
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354 | (3) |
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5.9.4 Closure of Transport Terms |
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357 | (1) |
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357 | (1) |
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358 | (3) |
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5.9.5 Effect of Pressure Fluctuations Gradients |
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361 | (3) |
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5.9.6 Summary of DNS Results |
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364 | (4) |
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5.10 Turbulent Combustion Modeling Approaches |
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368 | (1) |
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5.11 Geometrical Description of Turbulent Premixed Flames and G-Equation |
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368 | (8) |
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5.11.1 Level Set Approach for the Corrugated Flamelets Regime |
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371 | (3) |
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5.11.2 Level Set Approach for the Thin Reaction Zone Regime |
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374 | (2) |
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5.12 Scales in Turbulent Combustion |
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376 | (4) |
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5.13 Closure of Chemical Reaction Source Term |
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380 | (1) |
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5.14 Probability Density Function Approach to Turbulent Combustion |
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381 | (21) |
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5.14.1 Derivation of the Transport Equation for Probability Density Function |
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386 | (5) |
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5.14.2 Moment Equations and PDF Equations |
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391 | (1) |
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5.14.3 Lagrangian Equations for Fluid Particles |
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392 | (3) |
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5.14.4 Gradient Transport Model in Composition PDF Method |
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395 | (2) |
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5.14.5 Determination of Overall Reaction Rate |
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397 | (1) |
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5.14.6 Lagrangian Monte Carlo Particle Methods |
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398 | (1) |
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5.14.7 Filtered Density Function Approach |
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398 | (1) |
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5.14.8 Prospect of PDF Methods |
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399 | (1) |
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400 | (1) |
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400 | (1) |
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401 | (1) |
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6 Non-premixed Turbulent Flames |
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402 | (107) |
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6.1 Major Issues in Non-premixed Turbulent Flames |
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404 | (2) |
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6.2 Turbulent Damkohler number |
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406 | (1) |
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6.3 Turbulent Reynolds Number |
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407 | (1) |
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6.4 Scales in Non-premixed Turbulent Flames |
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407 | (7) |
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6.4.1 Direct Numerical Simulation and Scales |
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411 | (3) |
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6.5 Turbulent Non-premixed Combustion Regime Diagram |
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414 | (4) |
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6.6 Turbulent Non-premixed Target Flames |
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418 | (38) |
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419 | (1) |
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6.6.1.1 CH4/H2/N2 Jet Flame |
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420 | (10) |
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6.6.1.2 Effect of Jet Velocity |
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430 | (2) |
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432 | (16) |
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6.6.2.1 Comparison of Simple Jet Flame and Sandia Flames D and F |
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448 | (4) |
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452 | (3) |
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6.6.4 Swirl Stabilized Flames |
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455 | (1) |
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6.7 Turbulence-Chemistry Interaction |
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456 | (6) |
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6.7.1 Infinite Chemistry Assumption |
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456 | (1) |
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6.7.1.1 Unity Lewis Number |
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457 | (1) |
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6.7.1.2 Nonunity Lewis Number |
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458 | (1) |
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6.7.2 Finite-Rate Chemistry |
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458 | (4) |
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6.8 Probability Density Approach for Turbulent Non-premixed Combustion |
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462 | (14) |
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465 | (1) |
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6.8.2 Turbulent Transport in Velocity-Composition Pdf Methods |
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466 | (1) |
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6.8.2.1 Stochastic Mixing Model |
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467 | (1) |
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6.8.2.2 Stochastic Reorientation Model |
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468 | (1) |
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6.8.3 Molecular Transport and Scalar Mixing Models |
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469 | (2) |
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6.8.3.1 Interaction by Exchange with the Mean Model |
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471 | (1) |
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6.8.3.2 Modified Curl Mixing Model |
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471 | (1) |
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6.8.3.3 Euclidean Minimum Spanning Tree Model |
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472 | (4) |
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476 | (4) |
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6.9.1 Laminar Flamelet Assumption |
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477 | (1) |
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6.9.2 Unsteady Flamelet Modeling |
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478 | (1) |
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6.9.3 Flamelet Models and PDF |
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479 | (1) |
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6.10 Interactions of Flame and Vortices |
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480 | (12) |
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6.10.1 Flame Rolled Up in a Single Vortex |
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482 | (1) |
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6.10.2 Flame in a Shear Layer |
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483 | (1) |
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483 | (1) |
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6.10.4 Karman Vortex Street/V-Shaped Flame Interaction |
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484 | (1) |
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6.10.5 Burning Vortex Ring |
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484 | (1) |
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6.10.6 Head-on Flame/Vortex Interaction |
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485 | (1) |
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6.10.7 Experimental Setups for Flame/Vortex Interaction Studies |
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486 | (1) |
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6.10.7.1 Reaction Front/Vortex Interaction in Liquids |
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486 | (1) |
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487 | (1) |
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6.10.7.3 Counterflow Diffusion Flames |
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488 | (4) |
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6.11 Generation and Dissipation of Vorticity Effects |
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492 | (1) |
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6.12 Non-premixed Flame-Vortex Interaction Combustion Diagram |
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493 | (3) |
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6.13 Flame Instability in Non-premixed Turbulent Flames |
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496 | (4) |
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6.14 Partially Premixed Flames or Edge Flames |
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500 | (9) |
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6.14.1 Formation of Edge Flames |
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501 | (1) |
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6.14.2 Triple Flame Stabilization of Lifted Diffusion Flame |
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502 | (1) |
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6.14.3 Analysis of Edge Flames |
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503 | (3) |
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506 | (1) |
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506 | (1) |
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507 | (1) |
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507 | (2) |
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7 Background in Multiphase flows with Reactions |
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509 | (67) |
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7.1 Classification of Multiphase Flow Systems |
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512 | (2) |
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7.2 Practical Problems Involving Multiphase Systems |
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514 | (1) |
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7.3 Homogeneous versus Multi-component/Multiphase Mixtures |
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515 | (1) |
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7.4 CFD and Multiphase Simulation |
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516 | (4) |
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520 | (13) |
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7.5.1 Eulerian Average---Eulerian Mean Values |
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522 | (1) |
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7.5.2 Lagrangian Average---Lagrangian Mean Values |
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523 | (1) |
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7.5.3 Boltzmann Statistical Average |
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524 | (1) |
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7.5.4 Anderson and Jackson's Averaging for Dense Fluidized Beds |
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525 | (8) |
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7.6 Local Instant Formulation |
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533 | (3) |
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7.7 Eulerian-Eulerian Modeling |
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536 | (14) |
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7.7.1 Fluid-Fluid Modeling |
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536 | (2) |
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538 | (2) |
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7.7.2 Fluid-Solid Modeling |
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540 | (1) |
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541 | (6) |
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7.7.2.2 Dense Particle Flows |
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547 | (2) |
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7.7.2.3 Dilute Particle Flows |
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549 | (1) |
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7.8 Eulerian-Lagrangian Modeling |
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550 | (5) |
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7.8.1 Fluid-Solid Modeling |
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551 | (1) |
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551 | (1) |
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552 | (3) |
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7.9 Interfacial Transport (Jump Conditions) |
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555 | (6) |
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7.10 Interface-Tracking/Capturing |
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561 | (12) |
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7.10.1 Interface Tracking |
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563 | (1) |
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7.10.1.1 Markers on Interface (Surface Marker Techniques) |
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564 | (3) |
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7.10.1.2 Surface-Fitted Method |
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567 | (1) |
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7.10.2 Interface Capturing |
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568 | (1) |
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7.10.2.1 Markers in Fluid (MAC Formulation) |
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568 | (1) |
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7.10.2.2 Volume of Fluid Method |
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569 | (4) |
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7.11 Discrete Particle Methods |
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573 | (3) |
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575 | (1) |
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8 Spray Atomization and Combustion |
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576 | (147) |
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8.1 Introduction to Spray Combustion |
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578 | (2) |
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8.2 Spray-Combustion Systems |
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580 | (2) |
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582 | (2) |
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582 | (2) |
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8.3.2 Atomization Characteristics |
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584 | (1) |
|
|
584 | (10) |
|
8.4.1 Particle Characterization |
|
|
584 | (1) |
|
8.4.2 Distribution Function |
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|
585 | (3) |
|
8.4.2.1 Logarithmic Probability Distribution Function |
|
|
588 | (1) |
|
8.4.2.2 Rosin-Rammler Distribution Function |
|
|
588 | (1) |
|
8.4.2.3 Nukiyama-Tanasawa Distribution Function |
|
|
589 | (1) |
|
8.4.2.4 Upper-Limit Distribution Function of Mugele and Evans |
|
|
589 | (1) |
|
8.4.3 Transport Equation of the Distribution Function |
|
|
590 | (1) |
|
8.4.4 Simplified Spray Combustion Model for Liquid-Fuel Rocket Engines |
|
|
591 | (3) |
|
8.5 Spray Combustion Characteristics |
|
|
594 | (8) |
|
8.6 Classification of Models Developed for Spray Combustion Processes |
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|
602 | (3) |
|
8.6.1 Simple Correlations |
|
|
602 | (1) |
|
8.6.2 Droplet Ballistic Models |
|
|
603 | (1) |
|
8.6.3 One-Dimensional Models |
|
|
603 | (1) |
|
8.6.4 Stirred-Reactor Models |
|
|
604 | (1) |
|
8.6.5 Locally Homogeneous-Flow Models |
|
|
605 | (1) |
|
8.6.6 Two-Phase-Flow (Dispersed-Flow) Models |
|
|
605 | (1) |
|
8.7 Locally Homogeneous Flow Models |
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|
605 | (29) |
|
8.7.1 Classification of LHF Models |
|
|
606 | (3) |
|
8.7.2 Mathematical Formulation of LHF Models |
|
|
609 | (1) |
|
8.7.2.1 Basic Assumptions |
|
|
609 | (1) |
|
8.7.2.2 Equation of State |
|
|
609 | (6) |
|
8.7.2.3 Conservation Equations |
|
|
615 | (4) |
|
8.7.2.4 Turbulent Transport Equations |
|
|
619 | (1) |
|
8.7.2.5 Boundary Conditions |
|
|
620 | (1) |
|
8.7.2.6 Solution Procedures |
|
|
620 | (6) |
|
8.7.2.7 Comparison of LHF-Model Predictions with Experimental Data |
|
|
626 | (8) |
|
8.8 Two-Phase-Flow (Dispersed-Flow) Models |
|
|
634 | (66) |
|
8.8.1 Particle-Source-in-Cell Model (Discrete-Droplet Model) |
|
|
637 | (2) |
|
8.8.1.1 Models for Single Drop Behavior |
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|
639 | (15) |
|
8.8.2 Drop Breakup Process and Mechanism |
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|
654 | (1) |
|
8.8.2.1 Drop Breakup Process |
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|
654 | (5) |
|
8.8.2.2 Multi-component Droplet Breakup by Microexplosion |
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|
659 | (3) |
|
8.8.3 Deterministic Discrete Droplet Models |
|
|
662 | (2) |
|
8.8.3.1 Gas-Phase Treatment in DDDMs |
|
|
664 | (2) |
|
8.8.3.2 Liquid-Phase Treatment in DDDMs |
|
|
666 | (1) |
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|
667 | (2) |
|
8.8.4 Stochastic Discrete Droplet Models |
|
|
669 | (2) |
|
8.8.5 Comparison of Results between DDDMs and SDDMs |
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|
671 | (11) |
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|
682 | (1) |
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|
682 | (2) |
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|
684 | (6) |
|
8.8.6.3 Jet Breakup Models |
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|
690 | (9) |
|
8.8.6.4 Impinging Jet Atomization |
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|
699 | (1) |
|
8.9 Group-Combustion Models of Chiu |
|
|
700 | (6) |
|
8.9.1 Group-Combustion Number |
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|
701 | (2) |
|
8.9.2 Modes of Group Burning in Spray Flames |
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|
703 | (3) |
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|
706 | (4) |
|
8.10.1 Droplet-Droplet Collisions |
|
|
707 | (1) |
|
8.10.2 Droplet-Wall Collision |
|
|
708 | (2) |
|
8.10.3 Interacting Droplet in a Many-Droplet System |
|
|
710 | (1) |
|
8.11 Optical Techniques for Particle Size Measurements |
|
|
710 | (7) |
|
8.11.1 Types of Optical Particle Sizing Methods |
|
|
711 | (1) |
|
8.11.2 Single Particle Counting Methods |
|
|
711 | (1) |
|
8.11.2.1 Scattering Ratio Technique |
|
|
712 | (1) |
|
8.11.2.2 Intensity Deconvolution Method |
|
|
713 | (1) |
|
8.11.2.3 Interferometric Method (Phase-Shift Method) |
|
|
713 | (1) |
|
8.11.2.4 Visibility Method Using a Laser Doppler Velocimeter LDV |
|
|
713 | (1) |
|
8.11.2.5 Phase Doppler Sizing Anemometer |
|
|
713 | (1) |
|
8.11.3 Ensemble Particle Sizing Techniques |
|
|
714 | (1) |
|
8.11.3.1 Extinction Measurement Techniques |
|
|
714 | (1) |
|
8.11.3.2 Multiple Angle Scattering Technique |
|
|
714 | (1) |
|
8.11.3.3 Fraunhofer Diffraction Particle Analyzer |
|
|
715 | (1) |
|
8.11.3.4 Integral Transform Solutions for Near-Forward Scattering |
|
|
716 | (1) |
|
8.12 Effect of Droplet Spacing on Spray Combustion |
|
|
717 | (6) |
|
8.12.1 Evaporation and Combustion of Droplet Arrays |
|
|
717 | (3) |
|
|
720 | (3) |
Appendix A Useful Vector and Tensor Operations |
|
723 | (28) |
Appendix B Constants and Conversion Factors Often Used in Combustion |
|
751 | (4) |
Appendix C Naming of Hydrocarbons |
|
755 | (4) |
Appendix D Detailed Gas-Phase Reaction Mechanism for Aromatics Formation |
|
759 | (36) |
Appendix E Particle Size-U.S. Sieve Size and Tyler Screen Mesh Equivalents |
|
795 | (4) |
Bibliography |
|
799 | (70) |
Index |
|
869 | |