The current study goes over a design methodology for thin, two-phase heat spreaders for space constrained cooling applications. The evaporator section of the heat spreader employs enhancement structures to improve the spreader plate performance. The thermal performances of two such spreader prototypes, with integrated fins for cooling, were studied under both natural…
Contents
CHAPTER 1: INTRODUCTION
1.1 Motivation and Background
1.2 Literature Review
1.2.1 Review of enhanced surfaces in boiling
1.2.2 Review of flow visualization studies in boiling from enhanced surfaces
1.2.2.1 Nakayama et. al. visualization study
1.2.2.2 Arshad and Thome visualization study
1.2.2.3 Chien and Webb visualization study
1.2.2.4 Ghiu et al. visualization study
1.2.3 Analytical models for boiling from structured surfaces
1.2.3.1 Nakayama’s suction-evaporation model
1.2.3.2 Webb and Haider model
1.2.3.3 Chien and Webb’s suction-evaporation model
1.2.3.4 Ramaswamy et al. semi-analytical model
1.2.4 Numerical simulation of two-phase flows
1.2.4.1 Level set method
1.3 Overview of the Current Study
CHAPTER 2: EXPERIMENTAL SETUP AND PROCEDURES
2.1 Experimental setup
2.1.1 Copper prototype: Forced convection
2.1.2 Aluminum prototype: Natural convection
2.2 Data Acquisition
2.3 Experimental Procedures
2.4 Uncertainty Analysis
CHAPTER 3: TWO-PHASE HEAT SPREADER THERMALPERFORMANCE
3.1 Baseline Study
3.2 Effect of Condenser Cooling
3.3 Effect of Enhancement Structure Size
3.4 Effect of Liquid Fill Ratio
3.5 Effect of Starting System Pressure
3.6 Effect of Coolant Fluid
3.7 Effect of Stack Height
3.8 Orientation Study
3.9 Summary and Conclusions
CHAPTER 4: SEMI-ANALYTICAL MODEL FOR BOILING FROM ENHANCED STRUCUTURES
4.1 Semi-Analytical Model
4.1.1 Modeling bubble departure diameter
4.1.2 Modeling tunnel heat transfer
4.1.3 Modeling bubble frequency
4.1.4 Modeling initial film thickness
4.1.5 Modeling external heat transfer
4.1.6 Modeling nucleation site density
4.1.7 Prediction procedure
4.2 Results of Semi-Analytical Model
4.2.1 Prediction of departure diameter
4.2.2 Prediction of frequency
4.2.3 Prediction of heat flux
4.2.4 Performance prediction of two-phase heat spreaders
4.3 Summary and Conclusions
CHAPTER 5: NUMERICAL SIMULATION OF BOILING FROM ENHANCED STRUCUTRES
5.1 Projection Method
5.1.1 Predictor step
5.1.2 Projection step
5.1.3 Validation of flow solver
5.2 Level Set Formulation
5.2.1 Level set validation
5.3 Numerical Analysis
5.4 Solution Algorithm
5.5 Numerical Simulation Results
5.6 Summary and Conclusions
CHAPTER 6: SUMMARY, CONCLUSIONS ANDRECOMMENDATIONS FOR FUTURE WORK
6.1 Summary
6.2 Conclusions
6.3 Recommendation for Future Work
REFERENCES
Author: Murthy, Sunil
Source: University of Maryland
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