A modeling of in-tube condensation heat transfer for a turbulent annular film flow with liquid entrainment

Abstract

An analytical model is developed for condensation heat transfer coefficients for a turbulent annular film flow in tubes. This calculation model not only incorporates a new turbulent eddy viscosity profile modified from the Blangetti and Schlunder model but also liquid entrainment effect. In order to assess the prediction capability of the calculation model, an experiment was performed for measurement of condensation heat transfer coefficients of R22 in horizontal smooth tubes. The calculated condensation heat transfer coefficients of R22 were compared with present experimental data and some existing correlations. From the present analysis and experiment it is found that incorporating the effect of liquid entrainment into the calculation model gives better prediction capability for in-tube condensation heat transfer coefficients. Also, the proposed turbulent eddy viscosity model gives better prediction capability for the condensation heat transfer coefficients than that of the Blangetti and Schlunder model.