An experimental study on heat transfer and pressure drop of de-ionized water over a bank of shrouded staggered micro pin fins 243μm long with hydraulic diameter of 99.5μm has been performed. Average heat transfer coefficients have been obtained for effective heat fluxes ranging from 3.8 to 167Wcm2 and Reynolds numbers from 14 to 112. The results were used to derive the Nusselt numbers, total thermal resistances, and friction factors. It has been found that for Reynolds numbers below 50 long tube correlations overpredicted the experimental Nusselt number, while at higher Reynolds numbers existing 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 attributed to the obtained trend.

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