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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