MHD flow and heat transfer in a non-Newtonian liquid film over an unsteady stretching sheet with variable fluid properties

نویسندگان

  • Mostafa A.A. Mahmoud
  • Ahmed M. Megahed
چکیده

The present paper is concerned with the study of variable viscosity and variable thermal conductivity on the flow and heat transfer of an electrically conducting non-Newtonian power-law fluid within a thin liquid film over an unsteady stretching sheet in the presence of a transverse magnetic field. The transformed system of nonlinear ordinary differential equations describing the problem is solved numerically. The effects of various parameters on the velocity and temperature profiles are shown through graphs and discussed. The values of the local skin-friction coefficient and the local Nusselt number for different values of physical parameters are presented through tables. PACS Nos: 47.50.–d, 47.15.gm Résumé : Nous étudions ici les effets d’une viscosité et d’une conductivité thermique variables sur l’écoulement et le transfert de chaleur d’un fluide non Newtonien conducteur à l’intérieur d’un mince film liquide sur une surface instable élastique en présence d’un champ magnétique transverse. Le système transformé d’équations différentielles ordinaires non linéaires est alors solutionné numériquement. Nous présentons de façon graphique et analysons les résultats illustrant les effets des différents paramètres sur les profils de vitesse et de température. Nous présentons sous forme de tables les valeurs du coefficient local de friction de peau et du nombre local de Nusselt pour différentes valeurs des paramètres physiques. [Traduit par la Rédaction]

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تاریخ انتشار 2009