Abstract
This paper provides a comprehensive review of existing correlations for supercritical heat transfer of CO2 in microchannels, as well as a comparison of these correlations with experimentally measured data. Based on the experimental data, a new semi-empirical correlation is developed to predict the gas cooling heat transfer coefficient of supercritical CO2 in microchannels, within an error of 15% for most (91%) of the presented experimental data that were obtained in an 11-port microchannel tube with an internal diameter of 0.79 mm and with a pressure range of 8 to 10 MPa and mass flux range of 300 to 1200 kg/m2s.
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