Prediction of binary mixture boiling heat transfer coefficients using only phase equilibrium data

Abstract

A new method for predicting the variation of nucleate pool boiling heat transfer coefficients with composition for binary liquid mixtures is presented. It is shown that the rise in the local boiling point of the liquid, Δ T bp, adjacent to the heated surface caused by preferential evaporation of the volatile component has a limit at the peak nucleate heat flux. Δ T bp, can be determined from knowledge of only the phase equilibrium diagram at the pressure of interest. The resulting equation incorporating Δ T bp accurately predicts published experimental boiling heat transfer coefficients at heat fluxes well below the peak heat flux for six binary liquid mixture systems considered: ethanol-water, acetone-water, ethanol-benzene, nitrogen-argon, nitrogen-oxygen, and nitrogen-methane.