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E-raamat: Flow Boiling in Microgap Channels: Experiment, Visualization and Analysis

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Flow Boiling in Microgap Channels: Experiment, Visualization and AnalysisSuurem pilt
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Flow Boiling in Microgap Channels: Experiment, Visualization and Analysis presents an up-to-date summary of the details of the confined to unconfined flow boiling transition criteria, flow boiling heat transfer and pressure drop characteristics, instability characteristics, two phase flow pattern and flow regime map and the parametric study of microgap dimension. Advantages of flow boiling in microgaps over microchannels are also highlighted. The objective of this Brief is to obtain a better fundamental understanding of the flow boiling processes, compare the performance between microgap and conventional microchannel heat sinks, and evaluate the microgap heat sink for instabilities and hotspot mitigation.
1 Introduction
1(4)
1.1 Background
1(2)
1.2 Objectives
3(2)
References
4(1)
2 Design and Operating Parameters
5(8)
2.1 Experimental Flow Loop
5(1)
2.2 Test Section
5(3)
2.3 Microgap Test Surface
8(1)
2.4 Design and Operating Parameters
8(5)
References
11(2)
3 Characteristics of Two-Phase Flow Boiling in Microgap Channel
13(8)
3.1 Vapor Confinement Criterion in Microgap Channel
13(1)
3.2 Boiling Curve
14(2)
3.3 Two-Phase Local Heat Transfer Coefficient
16(2)
3.4 Two-Phase Pressure Drop Characteristics
18(3)
References
19(2)
4 Comparison of Flow Boiling Characteristics Between Microgap and Microchannel
21(8)
4.1 Flow Visualization of Boiling Processes in Microgap and Microchannel
21(1)
4.2 Comparison of Boiling Curve Between Microgap and Microchannel
22(2)
4.3 Comparison of Two-Phase Local Heat Transfer Coefficient
24(1)
4.4 Two-Phase Pressure Drop Characteristics Comparison Between Microgap and Microchannel
25(1)
4.5 Wall Temperature Uniformity Comparison Between Microgap and Microchannel Heat Sink
26(3)
References
28(1)
5 Optimization of Microgap Channel Dimension and Operating Conditions
29(12)
5.1 Vapor Confinement in Microgap Channel
29(2)
5.2 Flow Visualization of Boiling Processes in Microgap Channels
31(1)
5.3 Flow Boiling Curves
32(3)
5.4 Pressure Drop Curves
35(1)
5.5 Local Heat Transfer Coefficient Curves
36(2)
5.6 Uniformity of Wall Temperature
38(3)
References
40(1)
6 Surface Roughness Effects on Microgap Channel
41(10)
6.1 Flow Visualization
41(2)
6.2 Flow Boiling Curves
43(2)
6.3 Local Flow Boiling Heat Transfer Coefficient Curves
45(1)
6.4 Pressure Drop Curves
46(1)
6.5 Uniformity of Wall Temperature
47(4)
Reference
49(2)
7 Two-Phase Microgap Channel in Mitigating Flow Instabilities and Flow Reversal
51(16)
7.1 Comparison of Instabilities Between Microgap and Microchannel
51(3)
7.2 Influencing Factors of Instabilities in Microgap Heat Sink
54(13)
7.2.1 Microgap Size Effects
54(5)
7.2.2 Mass Flux Effects
59(1)
7.2.3 Heat Flux Effects
59(4)
7.2.4 Surface Roughness Effects
63(2)
References
65(2)
8 Two-Phase Microgap Channel Cooling Technology for Hotspots Mitigation
67(4)
8.1 Comparison of Hotspot Mitigation Ability of Microgap Channel with Microchannel Heat Sink
67(1)
8.2 Influencing Factors on Hotspots Mitigation in Microgap Heat Sink
68(3)
Reference
70(1)
9 Conclusions and Recommendations
71(4)
9.1 Conclusions
71(2)
9.2 Significances of This Study
73(1)
9.3 Recommendations for Future Work
73(2)
Appendix A Uncertainty Analysis for Experimental Data 75(4)
Appendix B Nomenclature 79(2)
Appendix C Data Reduction 81
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