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Numerical modelling of double-diffusive natural convection within an arc shaped enclosure filled with a porous medium | ||
| Journal of Heat and Mass Transfer Research | ||
| مقاله 4، دوره 1، شماره 2، بهمن 2014، صفحه 83-91 اصل مقاله (1.12 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2014.183 | ||
| نویسندگان | ||
| Ariyan Zare Ghadi* 1؛ Ali Haghighi Asl2؛ Mohammad Sadegh Valipour1 | ||
| 1Faculty of Mechanical Engineering, Semnan University, Semnan, Iran | ||
| 2Faculty of Chemical Engineering, Semnan University, Semnan, Iran | ||
| تاریخ دریافت: 23 آذر 1392، تاریخ بازنگری: 27 بهمن 1392، تاریخ پذیرش: 27 بهمن 1392 | ||
| چکیده | ||
| Numerical study of double-diffusive natural convective heat transfer in a curved cavity filled with a porous medium has been carried out in the current study. Polar system has been selected as coordinate system. As a result, all equations have been discredited in r and θ directions. Brinkmann extended Darcy model has been utilized to express fluid flow in porous matrix in the enclosure. Smaller and larger curved walls are supposed to be hot and cold sources, respectively. Other two walls are insulated. The numerical solution has been obtained based on the finite volume methodology via staggered grid system, which will be explained in detail in its respective section. Finally, at the result section the effects of all pertinent parameters i.e. Grashof number, Lewis number, Darcy number, and Buoyancy ratio on the fluid motion and medium thermal behavior have been illustratively discussed. Results reveal that an increasing in Lewis number has a negative effect on heat transfer, while it has a positive impact on mass transfer. It is also seen that the flow intensity is increased by decreasing Lewis number. In addition, it is observed that for the aiding flow case, average Nu and Sh numbers decrease with increasing buoyancy ratio, while for opposing flow cases Nu and Sh augment with decreasing buoyancy ratio. | ||
| کلیدواژه‌ها | ||
| FVM method؛ Double-diffusive convection؛ Arc-shaped cavity؛ porous media | ||
| مراجع | ||
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