ON THE CALCULATION OF MOMENTUM, HEAT, AND MASS TRANSFER IN LAMINAR AND TURBULENT BOUNDARY LAYER FLOWS ALONG A VAPORIZING LIQUID FILM

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Abstract
A numerical method is presented for predicting the laminar and turbulent flow of a binary gas mixture along a plane vaporizing liquid film. The shear layer flow including the heat and mass transfer at the gas-liquid interface is described by a system of boundary-layer equations. Each of the parabolic equations is numerically solved using an implicit finite-difference method of Hermitiah type. However, the overall solution procedure handles the coupled differential equations together with the boundary conditions in an explicit manner. Polynomials in terms of temperature are used to approximate the physical properties of the gas components at 1 atm pressure. Turbulence is accounted for by the algebraic eddy viscosity approach of Cebeci and Smith. The accuracy and efficiency of the numerical procedure developed is demonstrated for various temperatures of the external flow. A comparison of the numerical results with measurements in terms of flow profiles and Stanton numbers indicates good agreement.