The present study deals with the fluid flow and heat transfer in a pipe partially filled with porous media at a high Reynolds number. In addition to turbulence effects in this situation, interstitial fluid mixing within the pores plays an important role, causing significant thermal dispersion. The aim of the present study is to evaluate and compare the effects of these phenomena on the heat transfer rate in a pipe partially filled with porous media at the core and over the wall. The parameters studied are Darcy number, solid/fluid conductivity ratio, Reynolds number, Prandtl number, and porous layer thickness. The results showed that dispersion effects increase with the increase of Darcy number, porous layer thickness, and Prandtl number. A similar trend is also observed for the variation of turbulence effects with these parameters except for Darcy number. It was also found that the heat transfer rate in a pipe partially filled with a porous layer over the wall is mainly affected by thermal dispersion and turbulence effects inside the porous media, while the Nusselt number is not affected by these phenomena when the porous media is inserted at the core.

中文翻译：

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在高雷诺数下部分填充管的多孔层内的传热改性，包括色散效应

本研究处理了部分填充高雷诺数多孔介质的管道中的流体流动和传热。在这种情况下，除了湍流效应外，孔隙内的间隙流体混合也起着重要作用，引起明显的热分散。本研究的目的是评估和比较这些现象对在芯部和壁上部分填充有多孔介质的管道中传热速率的影响。研究的参数为达西数，固/流体电导率，雷诺数，普朗特数和多孔层厚度。结果表明，分散效应随着达西数，多孔层厚度和普朗特数的增加而增加。除了达西数以外，在这些参数下湍流效应的变化也观察到类似的趋势。还发现，在壁上部分填充有多孔层的管道中，传热速率主要受多孔介质内部的热扩散和湍流效应影响，而当多孔介质处于非饱和状态时，Nusselt数不受这些现象的影响。插入核心。