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Heat Transfer Research
Fator do impacto: 0.404 FI de cinco anos: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

Volumes:
Volume 50, 2019 Volume 49, 2018 Volume 48, 2017 Volume 47, 2016 Volume 46, 2015 Volume 45, 2014 Volume 44, 2013 Volume 43, 2012 Volume 42, 2011 Volume 41, 2010 Volume 40, 2009 Volume 39, 2008 Volume 38, 2007 Volume 37, 2006 Volume 36, 2005 Volume 35, 2004 Volume 34, 2003 Volume 33, 2002 Volume 32, 2001 Volume 31, 2000 Volume 30, 1999 Volume 29, 1998 Volume 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019018679
pages 1437-1455

A COMPUTATIONAL STUDY FOCUSED ON REVEALING THE RELATION BETWEEN CONVECTIVE AND RADIATIVE HEAT TRANSFER FROM A RADIANT HEATED WALL

Ozgen Acikgoz
Heat and Thermodynamics Division, Department of Mechanical Engineering, Yildiz Technical University, Yildiz, Istanbul 34349, Turkey

RESUMO

Asymmetric thermal radiation is a major reason deteriorating thermal comfort in living environments being caused by wide windows, cold surfaces arising from uninsulated walls or ceilings, and the walls exposed to solar radiation. This leads different parts of a human body to face surfaces having different temperatures, and thus discrete simultaneous radiation gains or losses, which brings discomfort. In the present investigation, to simulate this thermal discomfort condition, realistic thermal boundary conditions, emissivity values, and floor dimensions are selected and applied to an enclosure. The characteristics pertaining to a heated wall, such as the proportion of radiative to convective heat transfer coefficient alongside radiative and total heat flux are examined. To achieve this purpose, a computational fluid dynamics approach for convective data, and a theoretical calculation method for the solution of radiation heat transfer within the chamber are utilized. It is revealed that as the distance between the heated wall and the opposite wall (forming a heat sink that generates an asymmetric thermal radiation) increases from 3 m to 4 m, and to 6 m, the radiative heat transfer coefficient decreases and thus the range of the ratio hr/hc also narrows from 1.10-1.70 to 1.10-1.55 due to the dwindling effects of radiation. Furthermore, three novel correlations comprising the effect of asymmetric radiation in the chamber have been derived for the ratio hr/hc radiative heat flux qr, and the total heat flux qt the deviation ranges of which remain within ± 15%, ± 10%, and ± 15%, respectively.

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