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TWO-PHASE FLOW OF R245fa IN A MICROGAP WITH INTEGRATED STAGGERED CYLINDRICAL PIN FINS
Keywords: Two-phase flow, Microgap, Pin fins
Dielectric fluids, including refrigerants, are electrically inert and are a good candidate as working fluid in two-phase microsystem cooling applications. In this study, R245fa is investigated for flow boiling in a 1 cm x 1 cm heated microgap of height 200 μm, populated with circular cylindrical pin fins of diameter 150 m, and spacing 200 μm. The Si microgaps with the pin fin features are fabricated using deep reactive ion etch techniques.For heat fluxes up to 498 W/cm2, mass flux values ranging from 789 kg/m2s to 7896 kg/m2s and inlet temperatures of 13 oC and 18 oC, the surface temperatures, and pressure drops are measured.. These measurements reveal average two phase heat transfer coefficient up to 60 kW/m2K. High speed flow visualizations at frame rate of 2,229 fps elucidate the flow boiling patterns inside the microgaps. The visualizations have shown different two flow regimes including bubbly and foggy that are generated in the pin finned area.
Pouya Asrar,
Georgia Institute of Technology
Atlanta, GA
USA


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