Study on Heat and Mass Transfer under Frosting Condition

3rd Report : Theoretical Analysis Satisfied a Saturation Condition Between Temperature and Concentration of Water Vapor in the Case of Forced Convecion

Abstract

A set of boundary layer eqations - continuity, momentum, energy and diffusion equations - is solved numerically with satisfaction of a thermodynamic equilibrium between temperature and concentration of water vapor, when frost deposits on a flat plate under laminar forced convection.
The effects of frost surface temperature and ambient air condition - temperature and humidity - on the coefficients of heat and mass transfers are investigated. The relationships between Nusselt number and Reynolds number, and between Sherwood number and Reynolds number are maintained the similar tendency respectively whether the thermodynamic equilibrium is satisfied or not. When the eqlli1ibrillm is satisfied, the mass transfer coefficients are lower and the heat transfer coefficients are higher than ones without satisfaction of the equilibrium.