Proceedings Vol. 21 (2015)
ENGINEERING MECHANICS 2015
May 11 – 14, 2015, Svratka, Czech Republic
Copyright © 2015 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)
list of papers scientific commitee
pages 108 - 109, full text
The article deals with an improvement of recently developed model of natural draft wetcooling tower flow, heat and mass transfer [1]. The aim of present work is to make model more correct from the point of view of thermodynamics of two-phase flow. Void fraction of gas phase is included in governing equations. Homogeneous equilibrium model, where the two phases are well mixed and have the same velocity, is used. The main advantage of present approach is correct modelling of supersaturated moist air flow especially in the case where supersaturation occurs due to temperature decrease. Mathematical Model Void fraction of gas phase is a fraction of gas volume in two phase mixture over the total volume of the mixture. Overall density of two phase mixture can be expressed by using void fraction of gas phase as [2] ρ = αρg + (1 − α)ρl ,
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