Title :
Optimization of microchannel heat sinks using entropy generation minimization method
Author :
Khan, W.A. ; Yovanovich, M.M. ; Culham, J.R.
Author_Institution :
Dept. of Mech. Eng., Waterloo Univ., Ont.
Abstract :
In this study, an entropy generation minimization (EGM) procedure is employed to optimize the overall performance of microchannel heat sinks. This allows the combined effects of thermal resistance and pressure drop to be assessed simultaneously as the heat sink interacts with the surrounding flow field. New general expressions for the entropy generation rate are developed by considering an appropriate control volume and applying mass, energy, and entropy balances. The effect of channel aspect ratio, fin spacing ratio, heat sink material, Knudsen numbers and accommodation coefficients on the entropy generation rate is investigated in the slip flow region. Analytical/empirical correlations are used for heat transfer and friction coefficients, where the characteristic length is used as the hydraulic diameter of the channel. A parametric study is also performed to show the effects of different design variables on the overall performance of microchannel heat sinks
Keywords :
heat sinks; microchannel flow; minimisation; minimum entropy methods; Knudsen numbers; accommodation coefficients; channel aspect ratio; entropy generation minimization; entropy generation rate; fin spacing ratio; flow field; heat sink material; microchannel heat sinks optimization; pressure drop; slip flow region; thermal resistance; Entropy; Genetic expression; Heat sinks; Heat transfer; Microchannel; Minimization methods; Optimization methods; Resistance heating; Thermal resistance; Weight control;
Conference_Titel :
Semiconductor Thermal Measurement and Management Symposium, 2006 IEEE Twenty-Second Annual IEEE
Conference_Location :
Dallas, TX
Print_ISBN :
1-4244-0153-4
DOI :
10.1109/STHERM.2006.1625210
