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首页> 外文期刊>Journal of Heat Transfer >Notes on Steady Natural Convection Heat Transfer by Double Diffusion From a Heated Cylinder Buried in a Saturated Porous Media
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Notes on Steady Natural Convection Heat Transfer by Double Diffusion From a Heated Cylinder Buried in a Saturated Porous Media

机译：关于通过在饱和多孔介质中埋入的加热缸进行双重扩散来实现自然对流稳态传热的注意事项

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This paper aims to present numerical solutions for the problem of steady natural convection heat transfer by double diffusion from a heated cylinder buried in a saturated porous media exposed to constant uniform temperature and concentration in the cylinder and in the media surface. A square finite domain 3×3 and acceptance criterion converged solution with an absolute error under 1 × 10~(-3) were considered to obtain results presented. The Patan-kar's power law for approaching of variables calculated T, C, and φ also was adopted. In order of method validation, an investigation of mesh points number as function of Ra, Le, and N was done. A finite volume scheme has been used to predict the flow, temperature, and concentration distributions at any space from a heat cylinder buried into a fluid-saturated porous medium for a bipolar coordinates system. Examples presented show that the differences in the flow distribution caused not only when Rayleigh number range is considered but also when Lewis number range is considered. Further, increase in the Rayleigh number has a significant influence in the flow distribution when the concentration distribution is considered. Steady natural convection heat transfer by double diffusion from a heated cylinder buried in a saturated porous medium is studied numerically using the finite volume method. To model fluid flow inside the porous medium, the Darcy equation is used. Numerical results are obtained in the form of streamlines, isotherms, and isoconcentrations. The Rayleigh number values range from 0 to 1000, the Lewis number values range from 0 to 100, and the buoyancy ratio number is equal to zero. Calculated values of average heat transfer rates agree reasonably well with values reported in the literature.
机译：本文旨在通过埋入饱和多孔介质中的加热圆柱体的双重扩散，提供稳定的自然对流传热问题的数值解决方案，该圆柱体暴露在圆柱体和介质表面中恒定恒定的温度和浓度下。考虑绝对误差小于1×10〜（-3）的正方形有限域3×3和验收准则收敛解，得到了结果。还采用了Patan-kar的幂定律来逼近计算出的T，C和φ。为了进行方法验证，对网格点数作为Ra，Le和N的函数进行了研究。对于双极坐标系，已使用有限体积方案来预测从埋入流体饱和的多孔介质中的热缸到任何空间的流量，温度和浓度分布。给出的示例表明，流量分布的差异不仅在考虑瑞利数范围时引起，而且在考虑路易斯数范围时也引起。此外，当考虑浓度分布时，瑞利数的增加对流量分布具有重大影响。利用有限体积法对埋在饱和多孔介质中的加热圆柱体通过双重扩散产生的自然对流稳态传热进行了数值研究。为了模拟多孔介质内部的流体流动，使用了达西方程。以流线，等温线和等浓度形式获得数值结果。瑞利数值的范围是0到1000，路易斯数值的范围是0到100，浮力比值等于零。平均传热率的计算值与文献报道的值相当吻合。

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