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首页> 外文会议>Fourth International Conference on Advanced Computational Methods in Heat Transfer held in Udine, Italy, in July 1996 >Natural convection in a square enclosure partly filled with two layers of porous material
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Natural convection in a square enclosure partly filled with two layers of porous material

机译：正方形外壳中的自然对流，部分填充了两层多孔材料

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摘要

To-dimensional natural convective flow in a seqare enclosure with one vertical wall heated to a uniform temperature and with the opposite wall uniformly cooled to a lower temperature and with the remaining walls adiabatic has been conisdered. The enclosure is partly filled with a fluid and partly filled with porous media layers which are saturated with the same fluid, there being no partitions between the fluid and the porous media layers. There are two layers of porous material, one adjacent to the hot wall and one adjacent to the cold wall. These two porous layers have the same thickness and the pure fluid layer therefore occupies the central portion of the enclosure. It has been assumed that the flow is steady, laminar and two-dimensional and that fluid properties are constant except for the density change wit temperature which gives rise to the buoyancy forces, The governing equations have been written in terms of the stream function and vorticity and expresses in dimensionless form and solved using a finite difference procedure. Reslts have been obtained for a Prandtl number of 0.7 for a wide range of the governing parameters. The main results considered is the mean heat transfer rate across the enclosure, The effects of changes in the dimensionless thickness of the fluid laryer on the mean heat transfer rate have, in particular, been considered.
机译：已经考虑了在seqare外壳中按尺寸进行自然对流的过程，其中一个垂直壁被加热到均匀的温度，而相对壁均匀地冷却到一个较低的温度，而其余的壁则绝热。外壳部分填充有流体，部分填充了被相同流体饱和的多孔介质层，在流体和多孔介质层之间没有分隔壁。有两层多孔材料，一层与热壁相邻，一层与冷壁相邻。这两个多孔层具有相同的厚度，因此纯流体层占据了外壳的中央部分。假定流动是稳定的，层流的和二维的，并且流体的特性是恒定的，除了密度和温度的变化会引起浮力。控制方程式是根据流函数和涡度写的并以无量纲形式表示并使用有限差分程序求解。对于广泛的控制参数，Prandtl值为0.7的结果已经获得。所考虑的主要结果是整个外壳的平均传热速率。特别是考虑了流体层的无因次厚度变化对平均传热速率的影响。

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