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A numerical study of natural convection in a vertical cylindrical enclosure filled with a fluid-saturated porous medium using a three-dimensional model.

机译：使用三维模型对充满流体饱和多孔介质的垂直圆柱外壳中自然对流进行数值研究。

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摘要

This work considers the behavior of a vertical cylinder filled with fluid-saturated porous media. In particular, the focus is on the process of natural convection within the cylinder when the vertical surface is exposed to a constant heat flux, heating the interior of the cylinder. While many previous numerical studies of similar geometries were completed in two-dimensional space at steady-state, the present work uses a three-dimensional and transient model. A number of simulations are run involving a range of variables, helping to determine the effects of a few controlling parameters on the cylinder's overall thermal behavior. The control parameters analyzed are the Darcy number, the Rayleigh number, the modified Prandtl number, and the inertial form coefficient. The results indicate for symmetric heating that the Darcy number seems to have a predominant effect on the natural convection process inside the cylinder for the data range considered, with the inertial form coefficient and the modified Prandtl number having little effect. For asymmetric heating, the resulting Nusselt number was higher while the temperature results were lower. Hence, if heating the porous medium is the objective a symmetric heating of the cylinder is preferable.
机译：这项工作考虑了充满流体饱和多孔介质的垂直圆柱的行为。特别地，当垂直表面暴露于恒定的热通量，从而加热气缸内部时，重点在于气缸内的自然对流过程。虽然先前在相似状态的二维空间中完成了许多类似几何形状的数值研究，但本研究使用了三维瞬态模型。进行了一系列涉及一系列变量的模拟，有助于确定一些控制参数对气缸整体热性能的影响。分析的控制参数是达西数，瑞利数，修正的普朗特数和惯性形式系数。结果表明，对于对称加热，对于所考虑的数据范围，达西数似乎对圆柱体内的自然对流过程具有主要影响，而惯性形式系数和修正的普朗特数几乎没有影响。对于非对称加热，得到的努塞尔数较高，而温度结果较低。因此，如果以加热多孔介质为目标，则优选对圆筒进行对称加热。

著录项

  • 作者

    Murray, Daniel.;

  • 作者单位

    Southern Methodist University.;

  • 授予单位 Southern Methodist University.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2009
  • 页码 85 p.
  • 总页数 85
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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