Title: Natural convection analysis through a radiatively participating media within a rectangular enclosure

Authors: Fadhila Hajji; Akram Mazgar; Khouloud Jarray; Faycal Ben Nejma

Addresses: The Research Unit of Ionized and Reactive Media Study, The Preparatory Institute for Engineering Studies of Monastir, Ibn Al-Jazzar Street 5019, Monastir, Tunisia ' The Institute of Applied Sciences and Technology of Mahdia, Monastir University, Sidi Massoud, 5100, Mahdia, Tunisia ' The Research Unit of Ionized and Reactive Media Study, The Preparatory Institute for Engineering Studies of Monastir, Ibn Al-Jazzar Street 5019, Monastir, Tunisia ' The Preparatory Institute for Engineering Studies of Monastir, Monastir University, Ibn Al-Jazzar Street 5019, Monastir, Tunisia

Abstract: A computational approach for the modelling of combined gas radiation and laminar natural convection heat transfer within a rectangular enclosure is presented. One wall among the others is maintained at a constant higher temperature (Th) while the others are of a constant lower temperature (Tc). The discrete-ordinate method (DOM) through S12 directions is applied to resolve the radiative transport equation (RTE) while the 'statistical narrow band correlated-k' (SNBCK) model is adopted to provide gas radiative properties. The effect of radiative contribution, the enclosure tilt angle, the boundary and geometry conditions are presented. Special attention is given to the effect scales of these parameters on the average Nusselt numbers. The results show that radiative effect remarkably contributes to the acceleration of the vortexes, improving heat exchanges at walls.

Keywords: natural convection; thermal radiation; non-grey gas; statistical narrow band correlated-k; rectangular enclosure.

DOI: 10.1504/PCFD.2018.090339

Progress in Computational Fluid Dynamics, An International Journal, 2018 Vol.18 No.2, pp.108 - 126

Received: 13 Jan 2016
Accepted: 31 Aug 2016

Published online: 08 Mar 2018 *

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