Entropy generation analysis for variable viscous couple stress fluid flow through a channel with non-uniform wall temperature

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• 作者：J.A. Falade^a ; S.O. Adesanya^b ; ^{adesanyas@run.edu.ng" class="auth_mail" title="E-mail the corresponding author} ; J.C. Ukaegbu^b ; M.O. Osinowo^a
• 关键词：Couple stresses ; Variable viscosity ; Entropy generation ; Channel flow
• 刊名：Alexandria Engineering Journal
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：55
• 期：1
• 页码：69-75
• 全文大小：853 K

文摘

This article addresses the influence of couple stresses in minimizing of entropy generation rate associated with heat transfer irreversibility in the steady flow of a variable viscous fluid through a channel with a non-uniform wall temperature. The flow is induced by a constant axial pressure gradient applied in the flow direction. It is assumed that the fluid viscosity varies linearly with temperature. Analytical expressions for the dimensionless equations governing the fluid velocity and temperature are derived and used to obtain expressions for volumetric entropy generation numbers, irreversibility distribution ratio and the Bejan number in the flow field. Plots for different pertinent parameters entering the velocity and temperature fields are displayed and discussed.