Thermal characterization of the Casson fluid flow

in a circular pipe by considering viscous dissipation

 

W. Berabou, Y.K. Benkahla, A. Boutra, N. Labsi*

Université des Sciences et de la Technologie Houari Boumediene

Faculté de Génie Mécanique et de Génie des Procédés

B.P. 32 El-Alia, Bab-Ezzouar, 16111 Alger, ALGERIE

* Corresponding author. E-mail: nabilalabsi@yahoo.fr

Received: 23 December 2012; revised version accepted: 30 January 2013

 

Abstract

     The purpose of this work is to characterize, by means of finite volume method, the heat transfer of an incompressible Casson fluid flowing in a circular pipe maintained at uniform temperature. The study deals with the influence of Reynolds and Casson numbers on heat transfer. Because of the viscous character of this type of fluid, viscous dissipation is taken into account. The results show that the increase of the Reynolds number leads to the increase of the Nusselt number at the inlet. Furthermore, the latter is increased downstream when the Casson number increases. The introduction of viscous dissipation improves significantly heat transfer.

 

Keywords: Generalized Casson fluid; Yield stress; Finite volume method; Forced convection; Viscous dissipation.



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