Title Page
Contents
Nomenclature 10
Abstract 13
Ⅰ. Introduction 15
1.1. Background and Purpose 15
1.2. Objective and Research Method 17
1.3. Thesis Outline 18
Ⅱ. Comparative Study of Cooling Approaches for Power Inverter Modules 21
Ⅲ. Theory 25
3.1. Heat Transfer Equations of Extended Surfaces 25
3.2. Forced Convection 32
3.3. Dimensionless Parameters 33
Ⅳ. Numerical Modelling 38
4.1. Hydrofoil Fin 38
4.2. Hydrofoil Fin Heat Sink 39
4.3. Numerical Modelling 41
4.4. CFD Model of Hydrofoil Fin Heat Sinks 45
Ⅴ. Results and Discussions 48
5.1. Simulation Results 48
5.2. CFD model validation 52
5.3. Nusselt Number and Thermal Resistance of Hydrofoil Fin Heat Sinks 54
5.4. Comparison of Hydrofoil and Pin Fin Heat Sinks 59
Ⅵ. Conclusions 63
References 65
Table 1. Heat Sink and Hydrofoil Fin Dimension 40
Table 2. Solution Methods of Numerical Calculations 43
Table 3. Properties of Ethylene Glycol and Water Mixture (1:1) 44
Table 4. Parameters for mesh generation 45
Table 5. Summary of Hydrofoil Fin Heat Sinks configurations 47
Table 6. Summary of computational settings and solution methods of Hydrofoil Fin Heat Sinks 47
Figure 1. Energy balance of a pin fin 26
Figure 2. A hydrofoil fin boundary condition 28
Figure 3. Staggered hydrofoil fin arrangement 35
Figure 4. A hydrofoil fin structure 39
Figure 5. A hydrofoil fin heat sink structure 40
Figure 6. Visual Representation of Element Counts in Mesh Independence Test 45
Figure 7. Numerical Model and Boundary Conditions for Hydrofoil Fin Heat Sinks 46
Figure 8. Temperature field of the Hydrofoil Fin Heat Sinks: ST=4.75 mm, SL=8 and Hf=4 and 6 mm[이미지참조] 49
Figure 9. Temperature field of the Hydrofoil Fin Heat Sinks: ST=6.25 mm, SL=12 and Hf=4 and 6 mm[이미지참조] 49
Figure 10. Velocity fields of low-velocity flows in Hydrofoil Fin Heat Sinks 50
Figure 11. Velocity fields of high-velocity flows in Hydrofoil Fin Heat Sinks 51
Figure 12. Nusselt Number Variation with Reynolds Number for Different Correlations 52
Figure 13. Nusselt Number for Hydrofoil Heat Sink Configurations 56
Figure 14. Thermal Resistance for Hydrofoil Heat Sink Configurations 59
Figure 15. Comparison of Thermal Resistance between Hydrofoil Fin and Pin Fin Heat Sinks 62