Abstract
The present experiments are carried out to analyze the heat-transfer mechanism and study the effects of cavity mouth size of re-entrant cavity surfaces on boiling heat transfer in R410A quasi-azeotropic refrigerant mixtures at 7 and 10° C saturation temperature. The experiments are carried out for heat fluxes ranging from 10.7 to 79.7 kW/m2. An analysis of experimental data shows that the reentrant cavities with the mouth size of 0.51, 0.41, 0.31, 0.25, and 0.21 mm, and 0.11 mm can be advantageously used to enhance the heat-transfer coefficient of plain tubes. The nucleate boiling heat-transfer coefficients for R410A are 1.5-2.3 times more than plain tube surfaces. Finally, based on experimental data, correlations have also been developed for the prediction of heat-transfer coefficient during the pool boiling of saturated R410A over re-entrant cavity tubes.
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