《《Thermal-Hydraulic Performance》.pdf

Thermal-Hydraulic Performance of MEMS-based Pin Fin Heat Sink Ali Kos¸ar An experimental study on heat transfer and pressure drop of de-ionized water over a bank 1 Yoav Peles of shrouded staggered micro pin fins 243 m long with hydraulic diameter of 99.5 m e-mail: pelesy@rpi.edu has been performed. Average heat transfer coefficients have been obtained for effective heat fluxes ranging from 3.8 to 167 W/cm2 and Reynolds numbers from 14 to 112. The Department of Mechanical, results were used to derive the Nusselt numbers, total thermal resistances, and friction Aerospace and Nuclear Engineering, factors. It has been found that for Reynolds numbers below 50 long tube correlations Rensselaer Polytechnic Institute, overpredicted the experimental Nusselt number, while at higher Reynolds numbers exist- Troy, NY 12180 ing correlations predicted the results moderately well. Endwall effects, which diminish at high Reynolds numbers, and a delay in flow separation for compact pin fins were attrib- uted to the obtained trend. DOI: 10.1115/1.2137760 Keywords: MEMS, heat sink, pin fin, cross flow, friction factor, microchannel 1 Introduction high Reynolds numbers. However, the extent of this effect can