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The parameters had different influence on heat and mass transfer resistance and meniscus curvature radius, which affected the heat transfer coefficient. Heat transfer characteristics and degradation were analyzed for R134a/R245fa in two channels. A comparative model study was also performed in a rectangular channel and a circular channel. The sensible heat gradient, diffusion flux fraction, meniscus curvature radius, and heat transfer coefficient were analyzed. The influences of mass fraction, mass flux, wall sub-cooling temperature, and inlet pressure were considered with parametric analysis. The prediction error of heat transfer coefficients was within an acceptable range. An annular flow condensation model for binary zeotropic mixtures in the horizontal rectangular microchannel was developed, and it was validated with the experimental data for R134a/R245fa mixtures in the same conditions.
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