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A CFD parametric analysis of natural convection in an H-shaped cavity with two-sided inclined porous fins
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2020-10-02 , DOI: 10.1016/j.jtice.2020.09.011
Fatemeh Keramat , Ahmad Azari , Hossein Rahideh , Mohsen Abbasi

The performance of bilateral inclined solid and porous fins in natural convection within an H-shaped cavity with a hot bottom wall, cold vertical walls, and insulated horizontal walls are numerically investigated in this work. The key factors, namely Rayleigh number (Ra = 103 − 105), the porosity of fins (ε = 0 − 1), Darcy number (Da = 10−10 − 10−2), inclination angle of fins (α = 68o,90o,112o), and the aspect ratio of the cavity (AR = 0.1, 0.2) are analyzed comprehensively in 180 cases. Porous zone governing equation and buoyancy force within the cavity are implemented by volume-average theory and Boussinesq approximation, respectively. A 60% enhancement in mean Nusselt number is observed in the presence of porous fins compared to the solid fins. The maximum Nusselt number is obtained by the perpendicular fins (α = 90o) and the aspect ratio of (AR = 0.2). In addition, the fins with the Darcy numbers (Da < 10−6) behave like solid fins. Finally, two correlations between the significant parameters and average Nusselt number are presented.



中文翻译:

具有两侧倾斜多孔鳍片的H型腔中自然对流的CFD参数分析

在这项工作中,通过数值研究了在热底壁,垂直冷壁和水平隔热壁的H形腔内,自然对流中双侧倾斜的固体和多孔翅片的性能。关键因素,即瑞利数( = 10 3  - 10 5),翼片的孔隙率(ε= 0 - 1),达西数( = 10 -10  - 10 -2),翅片的倾斜角(α= 68 o,90 o,112 o)和腔体的纵横比(AR = 0.1,0.2)在180个案例中进行了综合分析。分别通过体积平均理论和Boussinesq逼近来实现多孔区域控制方程和空腔内的浮力。与固态散热片相比,在多孔散热片的存在下,平均努塞尔数提高了60%。最大Nusselt数由垂直鳍片(α= 90 o)和长宽比(AR  = 0.2)获得。另外,具有达西数(Da <10 -6)的鳍片的行为类似于实心鳍片。最后,给出了重要参数与平均努塞尔数之间的两个相关性。

更新日期:2020-10-16
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