An experimental investigation on the entire pool boiling curve of R14 under 0.1 MPa pressure

Abstract

In this work, the entire pool boiling curve of tetrafluoromethane (R14) under 0.1 MPa was experimentally acquired on a horizontal copper surface, and the nucleate boiling, critical heat flux (CHF) point, transition boiling, Leidenfrost point (the minimum film boiling point) and film boiling were observed. In the nucleate boiling regime, boiling heat transfer data and bubble images depicting the boiling behavior at different heat fluxes were obtained from the measurements. The measured heat flux at the CHF point is 220.39 kW m−2, and the corresponding surface superheat temperature is 16.1 K. The measured CHF data were also compared to several existing correlations, including the Bailey and Lienhard & Dhir correlations, both of which show good agreement. We also measured the boiling heat transfer data in the transition and film boiling regimes. The measured heat flux and surface superheat temperature of the Leidenfrost point were 126.83 kW m−2 and 87.1 K, respectively.