Second-law analysis for buoyancy-driven hydromagnetic couple stress fluid flow through a porous channel

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• 作者：Semiu O. Kareem^a ; ^{kareems@run.edu.ng" class="auth_mail" title="E-mail the corresponding author} ; Samuel O. Adesanya^b ; ^{adesanyas@run.edu.ng" class="auth_mail" title="E-mail the corresponding author} ; Uchechukwu E. Vincent^a ; ^c ; ^{u.vincent@lancaster.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Magnetic field ; Buoyancy force ; Entropy generation ; Slip flow ; Irreversibility ratio ; ADM
• 刊名：Comptes Rendus Mécanique
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：344
• 期：8
• 页码：547-555
• 全文大小：558 K

文摘

This paper examines the combined effects of the buoyancy force and of the magnetic field on the entropy generation rate in the flow of a couple stress fluid through a porous vertical channel. The flow's dynamical equations were non-dimensionalised and solved via the application of the Adomian decomposition method (ADM). Variations of some thermo-physical parameters were conducted and discussed, with regard to the physics of the fluid. Our result shows that the entropy generation rate increases as the buoyancy increases in the fluid. In addition, the irreversibility in the flow system results mainly from the fluid's viscosity, ohmic heating, and the buoyancy.