E-raamat: Advances in Heat Transfer

Contributors ix Preface xi Thermal Performance Testing of Industrial Heat Exchangers Thomas Lestina Kenneth Bell Introduction 2(9) Overview of Testing Needs and Capabilities 2(2) Industrial Operating Conditions 4(2) Description of a Thermal Model 6(5) Test Methods 11(8) Industrial Process Measurements 11(3) General Test Measurement Approach 14(4) Assessment of Test Quality 18(1) Analysis of Results 19(15) Experimental Heat Exchange Methods 19(6) Sources of Analysis Error 25(9) Uncertainty Assessment 34(11) Evaluating Experimental Uncertainty 35(1) Evaluating Uncertainty of Industrial Tests 36(9) Conclusions and Future Work 45(13) Nomenclature 47(2) References 49(9) Boiling Heat Transfer and Bubble Dynamics in Microgravity Johannes Straub Introduction 58(4) Importance of Fluid Studies under Microgravity 58(2) Short Historical Review 60(1) Application 61(1) Compensation of Earth Gravity 62(7) Principle of Compensation 62(1) Drop Towers and Drop Shafts 63(2) Parabolic Trajectories 65(4) Boiling Curve at 1-g and μ-g 69(7) Newtons Law of Heat Transfer 69(1) Boiling Regimes 70(3) Influence of Gravity on Boiling Correlations 73(3) Realization of Experiments 76(5) Limitations 76(1) Multiuser Facility 77(2) Experimental Equipment 79(1) Heater Elements 80(1) Heat Transfer at Saturated Nucleate Boiling 81(25) Wires as Heating Elements 81(15) Small Surfaces 96(5) Plane Plate Surface 101(5) Heat Transfer at Subcooled Nucleate Boiling 106(13) General Observations 106(1) Subcooled Heat Transfer on Wires 107(1) Subcooled Heat Transfer on Small Surfaces 108(3) Direct Electrical Heated Flat Plate 111(8) Critical Heat Flux 119(4) Film Boiling 123(4) Conclusions Drawn from Microgravity Boiling 127(1) Bubble Growth Model 128(8) Development of a Microwedge 128(4) Capillary-Adhesion Flow 132(4) Bubble and Boiling Dynamics 136(25) Analytical Bubble Growth Models in Homogeneous Liquid 136(3) Bubble Detachment in Saturated Liquids 139(8) Dynamics in Subcooled Boiling 147(11) Dynamics and Instability of CHF 158(3) Why Enhancement? Why Diminution? 161(4) Reasons for Heat Transfer Enhancement 161(3) Influencing Factors for Deterioration 164(1) Application of Boiling in Microgravity 165(1) Conclusions and Future Perspectives 166(7) Nomenclature 167(1) References 168(5) Heat Transfer and Fluid Flow in Rotating Sealed Cavities Wei Shyy Michael P. Ebert Introduction 173(7) Infinite Rotating Disk Flows 180(5) Finite Unshrouded Disk Systems 185(2) Isothermal Sealed Cavities 187(19) Rotor-Stator 187(11) Contrarotating 198(8) Sealed Cavities with an Imposed Thermal Gradient 206(10) Two-Equation Turbulence Model and Low Reynolds Number Effects 216(9) Turbulence Modeling for Rotational Effects 225(16) The Turbulent Transport Equations with Rotational Effects 227(2) Displaced Particle Analysis 229(2) Simplified Reynolds-Stress Analysis 231(2) Modeling Concepts for Treating Rotational Effects 233(2) Numerical Assessment of Rotational Effect 235(6) Numerical Convergence Considerations 241(3) Concluding Remarks 244(5) Appendix: Summary of Sealed Cavity Investigations 244(2) References 246(3) Recent Advances in the Modeling and Applications of Nonconventional Heat Pipes Suresh V. Garimella C. B. Sobhan Introduction 249(2) Thermal Analysis 251(20) Conventional Designs 251(5) Nonconventional Designs 256(15) Thermodynamics and Fundamental Aspects 271(5) Heat Pipe Startup from the Frozen State 276(3) Discrete Heat Sources at the Evaporator 279(1) Heat Pipe Applications 280(5) Micro Heat Pipes 285(9) Thermosyphons 294(3) Capillary Pumped Loops 297(1) Inventions and Patents 298(1) Closure 299(10) Nomenclature 301(1) References 302(7) Author Index 309(8) Subject Index 317