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首页> 外文期刊>Journal of porous media >NATURAL CONVECTION IN A CAVITY FILLED WITH POROUS MEDIUM WITH PARTIALLY THERMAL ACTIVE SIDEWALLS UNDER LOCAL THERMAL NONEQUILIBRIUM CONDITIONS
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NATURAL CONVECTION IN A CAVITY FILLED WITH POROUS MEDIUM WITH PARTIALLY THERMAL ACTIVE SIDEWALLS UNDER LOCAL THERMAL NONEQUILIBRIUM CONDITIONS

机译：局部热非平衡条件下充有多孔介质且部分热活性侧壁的空腔中的自然对流

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摘要

Steady non-Darcian natural convection in a square cavity filled with a heat-generating porous medium is studied numerically by adopting the local thermal nonequilibrium model. All of the walls of the enclosure are adiabatic except the left wall, which is set as the partially active thermal wall. Six different cooling zones are considered along the left vertical wall, and a two-equation model is used in consideration of the microscopic heat transfer between the solid and fluid phases. It is found that the cooling of a single wall can generate unsymmetrical distribution of streamlines, and isotherms of fluid phase in porous enclosures when Rayleigh number is high (Ra = 10(7)). The local Nusselt number of solid phase (Nu(sy)) presents symmetrical distribution about the center line of Y direction. The total heat transfer rate Q of case A has a higher value and its increasing rate becomes larger with the increase of porosity. Compared with other thermally active cases, the value of the total heat transfer rate Q of case E is the lowest with an increase of porosity.
机译：采用局部热非平衡模型，数值研究了充满生热多孔介质的方腔内稳态非达西自然对流。外壳的所有壁都是绝热的，左壁除外，左壁被设置为部分活动的热壁。沿左侧垂直壁考虑了六个不同的冷却区，考虑到固相和液相之间的微观传热，采用了两方程模型。已发现，当瑞利数较高时（Ra = 10（7）），单壁的冷却会产生流线的不对称分布，并在多孔罩中产生液相的等温线。固相的局部努塞尔数（Nu（sy））围绕Y方向的中心线呈现对称分布。壳体A的总传热率Q具有较高的值，并且其增加率随着孔隙率的增加而变大。与其他具有热活性的情况相比，随着孔隙度的增加，情况E的总传热率Q最低。

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