International Journal of Thermal Sciences, ( ISI ), Volume (112), Year (2017-2) , Pages (470-483)

Title : ( Effect of nanoparticles on condensation of humid air in vertical channels )

Authors: Iman Zeynali , Javad Abolfazli Esfahani , Kambiz Vafai ,

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In this paper, the effect of uniform surface injection of nanoparticles on humid air condensation, as a main type of vapor condensation in the presence of non-condensable gas (NCG), is numerically investigated. Various inlet conditions (velocity and relative humidity) of vertical CONAN type classical test section were modeled. Two mass concentrations of different nanoparticles were examined and the behavior of filmwise condensation was studied under different parameters of heat and mass transfer, such as: Reynolds number and mean Nusselt number of the condensed film, and local and mean Sherwood number. Finally, by using response surface methodology, the statistical interpretation (objective function) of the numerical results are provided for other inlet conditions. As shown in the results, an increase in the nanoparticles mass concentration has direct influence on condensate Reynolds number and Sherwood number of the humid air. At higher relative humidities (ω), using nanoparticles has more impact and the maximum improvement of the condensate Reynolds number (at the outlet), mean Nusselt number of the condensed film and mean Sherwood number are 11.4, 4.5 and 6%, respectively. It is observed that, under best conditions (ω = 100%, Uin = 3 m/s), 0.5% of nanoparticles mass concentration improves the total heat flux by more than 10.4%.

Keywords

, Filmwise condensation; Non, condensable gas; Nano, particles; Humid air; Heat and mass
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@article{paperid:1057003,
author = {Zeynali, Iman and Abolfazli Esfahani, Javad and Kambiz Vafai},
title = {Effect of nanoparticles on condensation of humid air in vertical channels},
journal = {International Journal of Thermal Sciences},
year = {2017},
volume = {112},
month = {February},
issn = {1290-0729},
pages = {470--483},
numpages = {13},
keywords = {Filmwise condensation; Non-condensable gas; Nano-particles; Humid air; Heat and mass transfer},
}

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%0 Journal Article
%T Effect of nanoparticles on condensation of humid air in vertical channels
%A Zeynali, Iman
%A Abolfazli Esfahani, Javad
%A Kambiz Vafai
%J International Journal of Thermal Sciences
%@ 1290-0729
%D 2017

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