Pressure drops and friction factors related to forced flow of de-ionized water over staggered/ in-line micro pin fin bundles (100-μm long, with hydraulic diameter of 50-μm and 100-μm, and with horizontal and vertical pitch ratios 1.5 and 5) possessing different cross-sections (circular/ diamond) have been experimentally investigated over Reynolds numbers ranging between 5-128. The applicability of conventional scale correlations to evaluate micro flow tests results has been assessed. It has been shown that available large-scale correlations do not adequately predict the pressure drop obtained at the micro scale.
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