Flow boiling of water across a bank of circular staggered micro pin fins, 250 μm long and 100 μm diameter with pitch-to-diameter ratio of 1.5, was experimentally studied for mass fluxes ranging from 346 kg/m2s to 794 kg/m2s and surface heat fluxes ranging from 20 W/cm2 to 350 W/cm2. The local two-phase heat transfer coefficients were measured using thermistors located along the flow path of the channel. The flow was visualized and classified as vapor slug and annular flow patterns. Based on the observed flow patterns, the dominant heat transfer mechanism during boiling process was assumed to be convective boiling.

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