Resumo

AHMED, S.. Free and forced convective MHD oscillatory flow over an infinite porous surface in an oscillating free stream. Lat. Am. appl. res. [online]. 2010, vol.40, n.2, pp.167-173. ISSN 1851-8796.

This paper deals with the mixed convection hydromagnetic oscillatory flow and periodic heat transfer of a viscous incompressible and electrically conducting fluid past an infinite vertical porous plate. The plate is subjected to a constant suction velocity and heat absorbing sinks, while the free stream is oscillating with time. A magnetic field of uniform strength is applied in the direction normal to the plate. The transient, nonlinear and coupled governing equations are solved using multi-parameter perturbation technique. Approximate solutions have been derived for the velocity and temperature fields as well as mean skin-friction and mean rate of heat transfer. It is found that, the increase in magnetic field strength leads to decrease transient velocity as well as temperature. Further, the amplitude (|H|) as well as phase (tan_) of the mean rate of heat transfer increases with increasing magnetic field strength (M) for electrolytic solution (Pr=1.0), while a reverse phenomenon is observed for mercury (Pr=0.025).

Palavras-chave : Unsteady Flow; MHD; Heat Transfer; Skin-Friction; Free Stream.

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