| Summary: | 碩士 === 國立虎尾科技大學 === 航空與電子科技研究所 === 98 === The study aims to investigate the natural convective heat transfer characteristics and cooling performance enhancement for a module mounted with arrays of discrete block heat sources in a three dimensional cabinet. The major objective of this study has three aspects. First, efforts are performed to investigate the influence of thermal interaction between the streams inside and outside the cabinet on the natural convective heat transfer characteristics for the heat source module. Second, attention is given to investigate the cooling performance enhancement of the module for different fin shape and configuration. Finally, the cooling performance enhancement of the module by constructing air vents in cabinet wall is conducted.
The numerical simulation is rigorously performed in this study. Owing to the consideration of the thermal interaction between streams inside and outside the cabinet, the numerical computation domain covers the cabinet and its surrounding area. In addition, an experimental system is set up to verify the results of numerical simulation. The difference in surface temperature of block heat source between the numerical and experimental data is within 0.01％~7.5％.
The result show that the maximum difference in hot spot temperatures of the blocks for the situations with and without consideration of thermal interaction for the closed cabinet can be up to 22.9 % as Pr = 0.7, 104≦Ra≦106, Kbf = Kpf = Kwf = 100 and Kff = 8000. The heat transfer characteristics increase with higher fin. The hot spot temperature can be reduced by 29.6% for fin height Fz = 0.3. For the ventilated cabinet with the heat source module mounted with fin, the hot spot temperature can be reduced by 48.6 %. In addition, variation of hot spot temperature is within 3% for the module position 0.2≦C3≦0.6.
|
|---|
