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MODELLING OF HEAT AND MASS TRANSFER WITH FOG FORMATION

J. Korber
Institut fur Technische Thermodynamik und Thermische Verfahrenstechnik University of Stuttgart, 70550 Stuttgait, Germany

K. Schaber
Institut fur Technische Thermodynamik und Thermische Verfahrenstechnik University of Stuttgart, 70550 Stuttgait, Germany

Abstract

A new model for gas-liquid heat and mass transfer in continuous contact devices involving fog foimation in the bulk gas phase has been developed. A key feature of this model is that the material and energy balances as well as the transport equations between both, the gas and the liquid phase of the contact device on the one hand and the growing aerosol droplets and the surrounding gas on the other hand are solved simultaneously. Thus it is possible to calculate actual supersaturations of the gas and to predict the growth of aerosol droplets along the interfacial area of the contact device. The model has been applied to absorption processes for hydrochloric acid, where heterogeneous nucleation and a monodispersed aerosol have been assumed. It is shown that aerosol droplets with very small diameters are formed, especially for high concentrations of condensation nuclei, which are typical for industrial gas scrubbing processes.

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