Proceedings of the Institution of Mechanical Engineers - Part C, ( ISI ), Volume (226), No (1), Year (2011-5) , Pages (145-153)

Title : ( An experimental assessment of the evaporation correlations for natural, forced and combined convection regimes )

Authors: amin jodat , Mohammad Moghiman ,

Citation: BibTeX | EndNote

Abstract

In the present study, the applicability of widely used evaporation models (Dalton approach-based correlations) is experimentally investigated for natural, forced, and combined convection regimes. A series of experimental measurements are carried out over a wide range of water temperatures and air velocities for 0:01  Gr=Re2  100 in a heated rectangular pool. The investigations show that the evaporation rate strongly depends on the convection regime’s Gr/Re2 value. The results show that the evaporation rate increases with the difference in vapour pressures over both forced convection (0:01  Gr=Re2  0:1) and turbulent mixed convection regimes (0:15  Gr=Re2  25). However, the escalation rate of evaporation decreases with Gr/Re2 in the forced convection regime whereas in the turbulent mixed convection it increases. In addition, over the range of the free convection regime (Gr=Re2  25), the evaporation rate is affected not only by the vapour pressure difference but also by the density variation. A dimensionless correlation using the experimental data of all convection regimes (0:01  Gr=Re2  100) is proposed to cover different water surface geometries and airflow conditions.

Keywords

, evaporation rate, forced convection, mixed convection, free convection
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@article{paperid:1025138,
author = {Jodat, Amin and Moghiman, Mohammad},
title = {An experimental assessment of the evaporation correlations for natural, forced and combined convection regimes},
journal = {Proceedings of the Institution of Mechanical Engineers - Part C},
year = {2011},
volume = {226},
number = {1},
month = {May},
issn = {0954-4062},
pages = {145--153},
numpages = {8},
keywords = {evaporation rate; forced convection; mixed convection; free convection},
}

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%0 Journal Article
%T An experimental assessment of the evaporation correlations for natural, forced and combined convection regimes
%A Jodat, Amin
%A Moghiman, Mohammad
%J Proceedings of the Institution of Mechanical Engineers - Part C
%@ 0954-4062
%D 2011

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