Heat transfer over an unsteady stretching surface with prescribed heat flux

Authors: Ishak, A; Nazar, R; Pop, I

Source: Canadian Journal of Physics, Volume 86, Number 6, June 2008 , pp. 853-855(3)

Publisher: NRC Research Press

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Abstract:

The unsteady laminar boundary-layer flow over a continuously stretching surface in a viscous and incompressible quiescent fluid is studied. The unsteadiness in the flow and temperature fields is caused by the time dependence of the stretching velocity and the surface heat flux. The nonlinear partial differential equations of continuity, momentum, and energy, with three independent variables, are reduced to nonlinear ordinary differential equations, before they are solved numerically by the Keller-box method. Comparison with available data from the open literature as well as the exact solution for the steady-state case of the present problem is made, and found to be in good agreement. Effects of the unsteadiness parameter and Prandtl number on the flow and heat transfer characteristics are thoroughly examined.PACS No.: 47.15.Cb

Nous étudions ici l'écoulement laminaire instable de la couche limite sur une surface en étirement continu dans un liquide visqueux, incompressible et au repos. L'instabilité de l'écoulement et du champ de température est causée par la variation dans le temps de la vitesse d'étirement et du flux de chaleur. Les équations différentielles non linéaires aux dérivées partielles pour la continuité, le moment et l'énergie, avec trois variables indépendantes, sont réduites à des équations différentielles ordinaires non linéaires, avant d'être solutionnées numériquement par la méthode de la boîte de Keller. Nous avons fait des comparaisons avec les données dispopnibles dans la littérature et avec la solution exacte pour pour le cas stationnaire et nous trouvons un bon accord. Nous examinons attentivement les effets de l'instabilité des paramètres et du nombre de Prandtl sur l'écoulement et le transfert de chaleur.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2008-06-01

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