Title: Entropy generation through combined non-grey gas radiation and natural convection in vertical pipe

Authors: Akram Mazgar, Faycal Ben Nejma, Kamel Charrada

Addresses: Unitede Recherche d'Etude des Milieux Ionise et Rectifs, Institut Preparatoire aux etudes d'Ingenieurs de Monastir, Avenue Ibn Eljazar Monastir 5019, Tunisie. ' Unitede Recherche d'Etude des Milieux Ionise et Rectifs, Institut Preparatoire aux etudes d'Ingenieurs de Monastir, Avenue Ibn Eljazar Monastir 5019, Tunisie. ' Unitede Recherche d'Etude des Milieux Ionise et Rectifs, Institut Preparatoire aux etudes d'Ingenieurs de Monastir, Avenue Ibn Eljazar Monastir 5019, Tunisie

Abstract: A numerical study is performed to analyse the entropy generation through combined non-grey gas radiation and natural convection in vertical circular tubes. The flow field and the energy equations are solved simultaneously and the radiative properties of water vapour and its spectral nature are modelled by using the |Ray tracing| method through S4 directions, associated with the ||Statistical Narrow Band Correlated-K (SNBCK)|| model. The effects of radiation and natural convection on Nusselt number and flow rate are presented. The development of velocity, temperature and entropy generation are also analysed in this study.

Keywords: natural convection; non-grey gas radiation; SNBCk model; entropy generation; vertical pipes; circular tubes; Nusselt number; flow rate.

DOI: 10.1504/PCFD.2009.027767

Progress in Computational Fluid Dynamics, An International Journal, 2009 Vol.9 No.8, pp.495 - 506

Published online: 10 Aug 2009 *

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