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EVAPORATION AND CONDENSATION OF FALLING BINARY LIQUID FILM

ABSTRACT
This paper investigates a numerical analysis of coupled heat and mass transfer during the simultaneous evaporation and condensation in the presence of a binary liquid film flowing on one of two parallel vertical plates under mixed convection. The first plate of a vertical channel is externally insulated and wetted by a binary liquid film while the second one is dry and isothermal. The liquid mixture consists of water (the more volatile component) and ethylene glycol while the gas mixture has three components: dry air, water vapour and ethylene glycol vapour. The conducted simulations enable the analysis of the heat and mass transfer during water evaporation and ethylene glycol condensation for different inlet gas properties. It is found that an increase of the inlet vapour concentration of ethylene glycol enhances the water evaporation while the increase of the inlet vapour concentration of water slightly enhances the ethylene glycol vapour condensation. The increase of inlet gas temperature considerably benefits the water evaporation and slightly influences the ethylene glycol condensation.
KEYWORDS
PAPER SUBMITTED: 2014-03-08
PAPER REVISED: 2014-12-01
PAPER ACCEPTED: 2015-03-08
PUBLISHED ONLINE: 2015-03-08
DOI REFERENCE: https://doi.org/10.2298/TSCI140423023N
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE 1, PAGES [211 - 222]
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© 2017 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence