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CONJUGATE MIXED CONVECTION-CONDUCTION HEAT TRANSFER IN POROUS MEDIA.

机译：在多孔介质中共轭混合对流换热传热。

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摘要

This dissertation studies analytically the conjugate mixed-convection conduction heat transfer in porous media. Solutions for mixed convection flows about vertical plate and cylindrical fins embedded in a porous medium have been obtained by including the effects of interactions between the conduction in the solid boundaries (fins) and the convection in the boundary layer. It has been found that the governing parameters are the Prandtl number Pr, buoyancy force parameter (OMEGA), convection conduction parameter Ncc, and the surface curvature parameter (lamda). Extensive results for heat transfer characteristics are presented graphically and in tabular forms for the following ranges of parameters: 0.05 (LESSTHEQ) Pr (LESSTHEQ) 7.5, 0.0 (LESSTHEQ) (OMEGA) (LESSTHEQ) 20.0, 0.0 (LESSTHEQ) Ncc (LESSTHEQ) 2.0 and 0.5 (LESSTHEQ) (lamda) (LESSTHEQ) 5.0. Many results were found to have trends similar to those for classical fluids. In particular, the local heat transfer coefficients for mixed convection flows were found not to decrease monotonically as usual, but instead, the coefficients decreased first, attained a minimum value and then increased with increasing streamwise distance. This behavior is attributable to an enhanced buoyancy force resulting from an increase in the wall-to-fluid temperature difference along the streamwise direction. The total heat transfer rates were found to decrease with increasing Ncc and (lamda).;A computational procedure based on the local nonsimilarity method has been established. The correctness of the numerical procedure was confirmed by verifying some special cases found in the literature. Throughout this study the porous medium was modeled by the use of the Darcy's law. A more generalized model was proposed for further studies.
机译：本文对多孔介质中共轭混合-对流传导导热进行了分析研究。通过将固体边界（鳍片）中的传导与边界层中的对流之间的相互作用包括在内，已经获得了围绕垂直板和嵌入多孔介质中的圆柱状翅片的混合对流的解。已经发现，控制参数是普朗特数Pr，浮力参数（OMEGA），对流传导参数Ncc和表面曲率参数（λ）。对于以下参数范围，以图形形式和表格形式显示了传热特性的广泛结果：0.05（LESSTHEQ）Pr（LESSTHEQ）7.5，0.0（LESSTHEQ）（OMEGA）（LESSTHEQ）20.0，0.0（LESSTHEQ）Ncc（LESSTHEQ） 2.0和0.5（LESSTHEQ）（lamda）（LESSTHEQ）5.0。发现许多结果具有与经典流体相似的趋势。特别是，发现混合对流的局部传热系数不会像往常一样单调降低，而是先降低，达到最小值，然后随着流向距离的增加而增加。此行为归因于沿流向的壁-流体温度差增加而产生的浮力增强。发现总传热率随着Ncc和λ的增加而降低。;建立了基于局部非相似性方法的计算程序。通过验证文献中发现的一些特殊情况，证实了数值程序的正确性。在整个研究过程中，使用达西定律对多孔介质进行建模。提出了一种更通用的模型以供进一步研究。

著录项

  • 作者

    LIU, JIN-YUAN.;

  • 作者单位

    University of Illinois at Chicago.;

  • 授予单位 University of Illinois at Chicago.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 251 p.
  • 总页数 251
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 遥感技术;
  • 关键词

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