On the Determination of the Surface Temperature of an Evaporating Liquid

Abstract

Some methods for calculating the wet-bulb temperature are compared. These methods are based on different forms of equations relating the heat and mass transfer in evaporation of a liquid into a gas flow. It is hypothesized that the deviation from the similarity between heat and mass transfer is described by the first power of the Lewis number, for which the parameters of the gas mixture are calculated on the phase-transition surface. In this case, the heat-transfer coefficients calculated from the enthalpy and temperature gradients of the gas–vapor mixture are equal to each other. The wet-bulb temperature calculated using this approach is in satisfactory agreement with experimental data.