کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
670084 | 1458773 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Free convection stagnation-point boundary-layer flow in a porous medium with a density maximum Free convection stagnation-point boundary-layer flow in a porous medium with a density maximum](/preview/png/670084.png)
The steady free convection boundary-layer flow near a stagnation point in a fluid-saturated porous medium is considered when the convecting fluid is close to its maximum density. Three forms for the wall boundary condition are treated, a prescribed wall temperature, prescribed wall heat flux and Newtonian heating. In each case the flow and heat transfer characteristics are determined by a dimensionless parameter δ that measures the difference between the ambient temperature and the temperature at which the fluid attains its density maximum. We find that solutions are possible for δ≥0δ≥0 for each case. For δ<0δ<0 there is a critical value δc of δ , the value of which depends on the boundary conditions applied, with solutions possible only for δ≥δcδ≥δc. The nature of this critical value, as well as other limiting asymptotic forms is discussed.
► Free convection in a porous medium near a density maximum with a nonlinear density-temperature relation.
► Comparison of different boundary conditions, prescribed surface temperature, heat flux and newtonian heating.
► Similarity solutions with ranges of dual solutions Critical parameter values with possible non-existence of solution.
Journal: International Journal of Thermal Sciences - Volume 50, Issue 11, November 2011, Pages 2176–2183