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Effect of emissivity on the heat and mass transfer of humid air in a cavity filled with solid obstacles.

Iyi, Draco; Hasan, Reaz; Penlington, Roger

Authors

Draco Iyi

Reaz Hasan

Roger Penlington



Abstract

The work reported here is a 2D numerical study on the buoyancy-driven low-speed turbulent flow of humid air inside a rectangular cavity partially filled with solid cylindrical objects for a Rayleigh number of 1.45 {D7} 109. Variations of Nusselt number, buoyancy flux, vapor mass fraction, and turbulence viscosity ratio are presented for various emissivity values of wall surfaces. It was observed that during the natural convection process, radiation effects are very significant and the air/water vapor combination results in a small increase in heat transfer as compared with the pure natural convection of dry air.

Journal Article Type Article
Publication Date May 31, 2015
Journal Numerical heat transfer, part A: applications
Print ISSN 1040-7782
Electronic ISSN 1521-0634
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 67
Issue 5
Pages 531-546
Institution Citation IYI, D., HASAN, R. and PENLINGTON, R. 2015. Effect of emissivity on the heat and mass transfer of humid air in a cavity filled with solid obstacles. Numerical heat transfer, part A: applications [online], 67(5), pages 531-546. Available from: https://doi.org/10.1080/10407782.2014.937261
DOI https://doi.org/10.1080/10407782.2014.937261
Keywords Buoyancy driven flow; Vapour mass; Turbulence viscosity; Heat transfer; Dry air; Wall heat transfer

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