Resumo

RASHAD, A.M.. Natural convection boundary layer flow along a sphere embedded in a porous medium filled with a nanofluid. Lat. Am. appl. res. [online]. 2014, vol.44, n.2, pp.149-157. ISSN 0327-0793.

A boundary-layer analysis is presented for the natural convec tion boundary layer flow about a sphere embedded in a porous medium filled with a nanofluid using Brinkman-Forchheimer-Darcy extended model. The model use d for the nanofluid inc orporates the ef fects of Brownian motion and thermophoresis. The governing partial differential equa tions are transformed into a set of nonsimilar equations and solved numerically by an efficient implicit, iterative, finite-difference method. Comparisons with previously published work are performed and excellent agreement is obtained. A parametric study of the physical parameters is conducted and a representative set of numerical results for the velocity, temperature, and nanoparticles volume fraction profiles as well as the local skin-friction coefficient, l ocal Nus selt and Sherwood numbers is illustrated graphically to show interesting features of the solutions.

Palavras-chave : Natural Convection; Porous Medium; Sphere; Nanofluid; Thermophoresis.

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