多孔介质方腔内混合对流换热数值研究  

Numerical Investigation on Mixed Convection Heat Transfer in a Porous Cavity

作　　者：张军伟 马兵善[1] 王刚[1] ZHANG Junwei;MA Bingshan;WANG Gang(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《甘肃科学学报》2022年第6期91-95,共5页Journal of Gansu Sciences

基　　金：国家自然科学基金项目(51266006)。

摘　　要：为了解多孔介质方腔内的混合对流换热特性,采用局部热平衡模型对开口多孔介质方腔内的混合对流换热进行了数值模拟,多孔介质方腔内流体的流动采用Brinkman-Darcy-Forchheimer模型来描述。腔体下壁面保持恒定高温,其余壁面为绝热,冷流体以恒定速度从腔体左下侧流体入口处进入腔体。研究了理查德森数、达西数、瑞利数和孔隙率对混合对流换热特性的影响。结果表明:热壁面的平均努塞尔数随理查德森数的增大而减小,随瑞利数和达西数的增大而增大,但平均努塞尔数几乎不受孔隙率的影响。In order to understand the characteristics of mixed convection heat transfer in a cavity filled with a porous media, the local thermal equilibrium model is used to numerically simulate the mixed convection heat transfer in a vented cavity filled with a porous medium.The fluid flow in the cavity filled with a porous medium is described by the Brinkman-Darcy-Forchheimer model.The lower wall of the cavity is kept as constant high temperature, and the rest of the walls are insulated, and the cold fluid enters the cavity from the fluid inlet on the lower left side of the cavity at a constant speed.The effects of Richardson number, Darcy number, Rayleigh number, and the porosity of porous medium on mixed convection heat transfer characteristics are analyzed.The results show that the average Nusselt number along the hot wall decreases with the increase of Richardson number, increases with the increase of Rayleigh number and Darcy number.However, the average Nusselt number is insensitive to the change of the porosity.

关 键 词：混合对流 多孔介质 方腔 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]