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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

FILM ABSORPTION HEAT AND MASS TRANSFER IN THE PRESENCE OF NON-CONDENSABLES

Get access (open in a dialog) DOI: 10.1615/IHTC9.760
pages 247-252

Abstract

The effect of non-condensable gases on the combined heat and mass transfer process in film absorption is analyzed. The diffusion and energy equations are solved in the liquid and gas phases to give the temperature and concentration distributions, from which heat and mass fluxes may be determined. An equilibrium relation between vapor pressure, temperature and concentration at the gas - liquid interface is derived, which makes it possible to consider the simultaneous variation of all three quantities. The reduction in mass flux due to non-condensables is found to depend most critically on the ratio of resistances to absorbate diffusion between the liquid and the gas. A significant difference is shown to exist between the total absence and small presence of non-condensables. The bulk concentration of non-condensables also contributes to the mass flux reduction as does the heat of absorption. Dimensionless parameters controlling the process are determined.