3D SIMULATION OF WATER FLOW IN POROUS HEAT SINK WITH TRAPEZOIDAL MICROCHANNEL

Effects of different entry/exit arrangements on thermal perfomiance of porous microchanncl heat sink (MCHS) of any geometry have not been studied yet. In this investigation, the effects of utilization of four different entryfexit arrangements have been studied numerically on electronic chip cooling utilizing trapezoidal MCHS withporous micro channels and porosity of 0.88. In A—type arrangement (Figure 1), entry and exit are located iii the center of the northern and southern walls, respectively.Entry and exit in B-type heat sink, in contrast to A-type, have been moved to the corners asymmetrically fi om the center of the northern and southern walls. Both Entry andexit in C-type are located in the western wall respectively in the center of the distributor and flow collector. In D-type heat sink, the exit has not changed compared with the C- type, but the entry has been moved to the eastern wall. For this purpose, three dimensional simulations of laminar forced convection flow in microchannels and conductionin solid pans of MCHS by applying constant heat flux of I50 kWm 3 at its base plate have been performed utilizing the finite volume method and the commercial Ansys-CFXcode. The results indicate that using porous Inedia is effective in reducing the MCHS base plate temperature and in this regard the D-type arrangement has the best performance among the heat sinks studied. With considering positive effect of using porous media on increasing the heat transfer coefficient and its negativeeffect 011 increasing the required pumping power, the A- type arrangement has the best perfonnanee.

Keywords:

Porous medium , Heat sink. Microehannel , Cooling , Entry/exit arrangements