Wall-Driven Versus Pressure Gradient-Driven Flows in Porous Media |
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Authors: | Eugen Magyari |
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Institution: | 1. Departement Physik, Theoretische Physik, Universit?t Basel, Klingelbergstrasse 82, 4056?, Basel, Switzerland
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Abstract: | The heat transfer characteristics of two boundary layer flows past an isothermal plane surface adjacent to a saturated Darcy–Brinkman porous medium is compared to each other in this paper. The flows are driven either by a stretching of the adjacent plane boundary, or by an external pressure gradient. It is found that below a threshold value $\tilde{P}r_{*} $ of the modified Prandtl number $\tilde{P}r$ , the Nussselt number in case of the pressure gradient-driven flow is larger than in case of the wall- driven flow, while for $\tilde{P}r>\tilde{P}r_{*} $ the flow driven by the moving wall provides a more efficient heat transfer mechanism. The dependence of $\tilde{P}r_{*} $ on the Darcy number is also discussed in detail. |
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