1998
DOI: 10.1016/s0169-5983(97)00044-0
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Unsteady mixed convection around a sphere in a porous medium at low Peclet numbers

Abstract: The unsteady forced and free mixed convection around a sphere immersed in a uid-saturated porous medium is investigated at low Peclet numbers with Gr=Re = O(1). Darcy ow model is used for the velocity ÿeld. The sphere is suddenly heated, and subsequently, maintains a constant temperature over the surface. Asymptotic solutions for small Peclet numbers are obtained using the method of matched asymptotic expansions, and the e ects of the buoyancy force on the transient velocity and temperature ÿelds are examined … Show more

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