Title: Transient response and entropy generation minimisation of a finite size radiation heat shield with finite heat capacity and temperature-dependent emissivities

Authors: Abdul Aziz; Mohsen Torabi

Addresses: Department of Mechanical Engineering, School of Engineering and Applied Science, Gonzaga University, Spokane, WA 99258, USA ' Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong

Abstract: The paper presents a numerical study of the transient response of a rectangular radiation heat shield inserted between two planes, grey, diffuse, parallel, rectangular surfaces. The radiation shield is assumed to have different emissivities on its top and bottom surfaces, and both are assumed to be linear functions of temperature. A specific configuration is investigated in detail to highlight the transient as well as the steady state thermal characteristics of the system. The paper derives an equation to calculate the steady state shield temperature for minimum entropy generation. Results are presented in graphical or tabular forms.

Keywords: plane radiation heat shields; finite heat capacity; transient response; steady state shield temperature; heat transfer rate; shield top surface emissivity; shield bottom surface emissivity; analytical solutions; minimum entropy generation.

DOI: 10.1504/IJEX.2013.052545

International Journal of Exergy, 2013 Vol.12 No.1, pp.87 - 108

Received: 31 Oct 2011
Accepted: 26 May 2012
Published online: 11 Mar 2013 *

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