Semi-Analytical Determination of Heat Transfer Coefficients in Nucleate PoolBoiling of Pure Liquids

摘要

In this work we have modified a semi-empirical correlation for evaluating heattransfer coefficients for a variety of liquids possessing different physico-thermal properties. The liquids under investigation were hydrocarbons and distilled water. Data were chosen for a wide range of heating surfaces, heat flux, and pressures. The correlation for heat transfer coefficient is based on two main factors contributing for heat removal from the surface. The first factor includes removal of heat by transient heat conduction to, and subsequent replacement of, superheated layer around boiling sites. The second factor takes into account the latent heat transport during growth of vapor bubbles. The equations for bubble emission frequency, f were developed analytically. Laplace Equation was used for the bubble departure diameters. The correlation predicts boiling heat transfer data well for hydrocarbons and distilled water.