Numerical Study of Pin-Fin Heat Sinks in a Turbulent Jet Impinging Channel

Y.-T. Yang and H.-S. Peng (Taiwan)

Keywords

pinfin heat sink, porous media, turbulent jet, CFD

Abstract

This study presents the numerical simulation of pin fin heat sinks with confined impingement cooling. The governing equations are discretized by using a Control Volume-Based finite-difference method with power-law scheme on an orthogonal non-uniform staggered grid. The coupling of the velocity and the pressure terms of momentum equations are solved by SIMPLE (Semi Implicit Method for Pressure-Linked Equation) algorithm. The parameters include Reynolds number ( Re ), fin width (W ), fin height ( H ), and number of fins ( n ). A strategy of porous model is adopted in order to approach the heat sink. The correlation equation depends on the fin geometry and conductivity is applied to combine the values for the equivalent porous medium parameters. The results show that increasing the Reynolds number reduces the thermal resistance. The reduction of the thermal resistance decreases gradually with the increasing of Reynolds number. Furthermore, increasing the fin width or height to enlarge the heat exchange surface can also decrease the thermal resistance. The outcomes of fin geometry at a low Reynolds number are more significant than that at a high Reynolds number. As for the optimization of the number of fins in the present study, the results show good practical choices of pin fin arrays of 6 6× and 7 7× for Re = 5000, 7 7× for Re = 10000~15000, and 8 8× for Re = 20000~25000.

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