ANALYSIS OF UNIFORM SEMI-POROUS HEAT SINK MEDIAS …分析semi-porous均匀散热媒体….docVIP

An Analysis of Porous media heat Sinks for natural convection cooled microelectronic Systems. by Eric R. Savery Engineering Project submitted in partial fulfillment of the requirements for the degree of Master of Engineering In Mechanical Engineering Approved by Ernesto Gutierrez-Miravete, Engineering Project Advisor Rensselaer Polytechnic Institute Hartford, Connecticut December, 2011 Table of Contents: List of Tables iii List of Figures iv Nomenclature v Acknowledgement vi Abstract vii 1. Introduction 1 3. Methodology/Approach 5 3.1. Assumptions 5 3.2. Theory 6 3.3. Finite Element Modeling 10 4. Results and Discussion 14 5. Conclusion 26 6. Appendix 1 27 7. Appendix 2 28 8. Appendix 3 29 9. Appendix 4 30 10. Reference 31 List of Tables Table 1: Porous Heat Sink Characteristics 10 Table 2: Block Form 11 Table 3: Control Block Heat Sink Results 14 Table 4: Porous Heat Sink Results 17 Table 5: Number of Element for Element Pre-set 25 List of Figures Figure 1: Fin Heat Sink 1 Figure 2: Schematic Representation of Microelectronic Heat Sink 2 Figure 3: No Heat Sink 3 Figure 4: Solid Block Heat Sink 3 Figure 5: Porous Heat Sink 4 Figure 6: Schematic Representation of system 5 Figure 7: Temperature vs. Density 7 Figure 8: Different Porosity, Same Permeability 8 Figure 9: Same Porosity, Different Permeability 8 Figure 10: No Heat Sink Mesh 12 Figure 11: Solid Block Mesh 12 Figure 12: Porous Block Mesh 13 Figure 13: No Heat Sink T-V (Isotherms and Velocity Vectors 15 Figure 14: Solid Heat Sink T-V (Isotherms and Velocity Vectors) 15 Figure 15: Porous Heat Sink Isotherms and Velocity Field 16 Figure 16: Porous Heat Sink Streamlines and Velocity Magnitude 17 Figure 17: Effect of Porosity Effect on Heat Removal 19 Figure 18: Permeability Effect on Heat Transfer 20 Figure 19: Permeability Effect on Volumetric Flow Rate 21 Figure 20: Effect of Permeability on Total Heat Flux 22 Figure 21: Effect of Permeability on Volume Flow Rate 22 Figure 22: Effect