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- W2158429042 abstract "Flow boiling of refrigerant HFC-134a in a multi-microchannel copper cold plate evaporator is investigated. The heat transfer coefficient is measured locally for the entire range of vapor qualities starting from subcooled liquid to superheated vapor. The test piece contains 17 parallel, rectangular microchannels (0.762 mm wide) of hydraulic diameter 1.09 mm and aspect ratio 2.5. The design of the test facility is validated by a robust energy balance as well as a comparison of single-phase heat transfer coefficients with results from the literature. Results are presented for four different mass fluxes of 20.3, 40.5, 60.8, and 81.0 kg m−2 s−1, which correspond to refrigerant mass flow rates of 0.5–2.0 g s−1, and at three different pressures 400, 550 and 750 kPa corresponding to saturation temperatures of 8.9, 18.7, and 29 °C. The wall heat flux varies from 0 to 20 W/cm2 in the experiments. The heat transfer coefficient is found to vary significantly with refrigerant inlet quality and mass flow rate, but only slightly with saturation pressure for the range of values investigated. The peak heat transfer coefficient is observed for a vapor quality of approximately 20%." @default.
- W2158429042 created "2016-06-24" @default.
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- W2158429042 date "2008-09-01" @default.
- W2158429042 modified "2023-09-30" @default.
- W2158429042 title "Refrigerant flow boiling heat transfer in parallel microchannels as a function of local vapor quality" @default.
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- W2158429042 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2008.01.026" @default.
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