Number：

04095005

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Name：

曾憲中

Titles：

Associate professor

Author：

鄭澤明 , 曾憲中

Paper name：

具側面旁通效應之方柱陣列於強制熱對流流動下之緊緻模式

Name of activity：

第十三屆全國計算流體力學學術研討會

Keywords：Compact model, Porous approach, Pin-fin heat sink, Bypass effect.

Abstract：This work illustrates the compact heat sink simulations in forced convection flow with side-bypass effect. Conventionally, the numerical study of the fluid flow and heat transfer in finned heat sinks employs the detailed model. It will spend a lot of computational time. Therefore, some investigators begin to numerically study such problem by using the compact model (i.e. the porous approach) since the regularly arranged fin array can be set as a porous medium. The computations of the porous approach model will be faster than those of the detailed mode due to the assumptations of the volume-averaging technique. This work uses the Brinkman-Forchheimer model for fluid flow and two-equation model for heat transfer. A configuration of in-line square pin-fin heat sink situated in a rectangual channel with fized height (H=23.7mm) and two equal-spacing bypass passengers beside the sides of the heat sink is successfully studied. The 9x9 pin-fin arrays with various porosities (ε=0.358-0.750), confined within a square spreader whose side length (L) is 67 mm, are employed. The numerical results suggest that the optimal porosity is ε=0.750 based on the maximum ratio of Nusselt number to dimensionless pumping power (Nul (△PxRe³ )). Besides, based on medium Nul(△PxRe³ ) value and suitable channel size, W/L=2-3 is suggested as the optimal size ratio of channel to heat sink.

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