NUMERICAL OPTIMIZATION OF THE THERMAL PERFORMANCE OF A POROUS-MICROCHANNEL HEAT SINK

作者：Hung Tu Chieh; Huang Yu Xian; Sheu Tsung Sheng; Yan Wei Mon^*

来源：Numerical Heat Transfer Part A-Applications, 2014, 65(5): 419-434.

DOI：10.1080/10407782.2013.836005

The present study deals with the optimal geometric parameters design of a microchannel heat sink (MCHS) filled with sintered porous medium through an optimization procedure. This procedure integrates the simplified conjugate-gradient method (SCGM) and a three-dimensional heat sink model as an optimizer. The optimal design variables such as the number of channel N, channel-width ratio , and channel aspect ratio that minimize the overall thermal resistance of the microchannel heat sink are obtained under various pumping powers and porous conditions. Optimization results show that, for a given pumping power, the optimal design variables are N=108, =0.90, and =8.15, with a corresponding minimum overall thermal resistance of 0.070KW(-1), and the overall thermal resistance is decreased by 40% over that of the initial guess (N=56, =0.4, =4.8, and R-T=0.115KW(-1)). The predicted results also reveal that the optimal thermal resistance and all the corresponding optimal values of N, , and decrease with the increase of porosity. Moreover, as the pumping power increases, the optimal thermal resistance decreases, both the corresponding optimal values of N and increase, where as reaches a maximum limitation. The proposed combined approach is effective in optimizing the geometric parameters for a porous-microchannel heat sink.

• 出版日期2014-3-1