Journal
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Volume 40, Issue -, Pages 54-64Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2013.01.007
Keywords
Natural convection; Radiation; Cavity; Thin plate; Finite volume method
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Funding
- University Grants Commission, India
- CSIR, India
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This paper reports a fundamental theoretical study made to understand the interaction of surface radiation and natural convection in an air filled cavity with a centrally placed thin heated plate. The vertical walls of the cavity are cooled while the horizontal ones are insulated. The thin plate is assumed to be isothermal and is placed horizontally or vertically. The governing equations were solved using a finite volume method on a uniformly staggered grid system. The effects of the pertinent parameters, viz., Rayleigh number (10(5) <= Ra <= 10(7)), plate length (0.25 <= D <= 0.75) and emissivity (0 <= epsilon <= 1) are investigated in detail. In general the results indicate a better homogenization of temperature field within the cavity by radiation. It is also found that the contribution of the convective mechanism to the overall heat transfer increases with emissivity when the plate is horizontally placed whereas decreases when it is vertically placed. This study demonstrates that any model representing a situation of this kind that ignores surface radiation leads to erroneous predictions. (C) 2013 Elsevier Inc. All rights reserved.
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