Natural Convection Heat Transfer Characteristics and cooling Performance Enhancement for a Module with Block Heat Sources in a Three Dimensional Cabinet

• Main Authors: Ci-Ming Huang, 黃啟銘
• Other Authors: Yeong-Ley Tsay
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/sm6btd

碩士 === 國立虎尾科技大學 === 航空與電子科技研究所 === 97 === This study aims to investigate natural convection heat transfer characteristics and cooling performance enhancement for a module with block heat sources in a three dimensional cabinet. The major objective of this study has two aspects. First, efforts are performed to examine the influences of thermal interaction between the fluids inside and outside the cabinet on the flow structure, temperature distribution and Nu number. Second, air vents are proposed to construct in the three dimensional cabinet wall, attentions are paid to conduct the enhancement of cooling performance of the block heat sources. The numerical computation domain covers the cabinet and surrounding area, the temperature and heat flux on the cabinet surface are not previously known and have to be found in the solution processes, In addition, in order to verify the numerical simulation, this study has set up an experimental system. The difference in surface temperature of block between the numerical and experimental data is within 11.1％~22.5％. The maximum difference in hot spot temperatures of the blocks for the situations with and without consideration of thermal interaction can be up to 24.5 % as Pr = 0.7, 104≦Ra≦106, 100≦Kbf = Kpf = Kwf = 1000 and Kff = 8000. When air vents are constructed in the cabinet wall, the hot spot temperature can be reduced by 30.5 %. In addition, when fin is constructed on the back side of the board for the ventilated cabinet, the hot spot temperature can be reduced by 52 %.