Exploring Impacts of Using Porous Media on Heat Transfer in Helical Coils: A Comprehensive Numerical Study

IF 2.5 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Porous Media Pub Date : 2024-08-01 DOI:10.1615/jpormedia.2024052876

Hamid-Reza Bahrami, Mahdi Mohseni

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Abstract

This research investigates the thermal performance of a helically coiled tube filled with a porous material. The study uses numerical simulations over a wide range of Reynolds and Darcy numbers. The porous materials used are steel, aluminum, and copper. To determine the contribution of porous material as well as the spiraling effects of the pipe to increased heat transfer, the simulations were also run for a helical coil without porous material and a porous-filled straight tube. The pitch and radius of the coil were varied, resulting in different coil turns for a given length of the pipe. The rate of exergy destruction in different states was calculated to determine the optimal operating point of the system. The study reveals that porous material significantly improves heat transfer in both straight and helical tubes. The optimal performance is achieved at higher Darcy numbers, with heat transfer being independent or dependent on Re. The highest Nu value is around 450 at Da=0.1 and Re=2000, about 103 times and 17 times the Nu in the straight and helical tubes without porous material, respectively. However, the peak value of PEC is 2 and 17 with respect to porous-filled straight tubes and non-porous helical coils. The main achievement of this study is that it shows that porous media can be applied to amplify heat transfer beside the secondary flow in helical tubes under specific conditions. This enhancement occurs when using porous media with high Da numbers, such as Da ~ 0.1. In contrast, the study shows that using porous media with low permeability (Da ~ 0.0001) surpasses secondary flows effects where the thermal performances of porous filled helical tubes and straight t

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探索使用多孔介质对螺旋线圈传热的影响：综合数值研究

这项研究调查了充满多孔材料的螺旋卷管的热性能。研究采用数值模拟的方法，在很大的雷诺数和达西数范围内进行。使用的多孔材料有钢、铝和铜。为了确定多孔材料的贡献以及管道的螺旋效应对增加传热的影响，还对无多孔材料的螺旋盘管和充满多孔材料的直管进行了模拟。线圈的间距和半径不同，导致给定长度管道的线圈匝数不同。通过计算不同状态下的能量损耗率，确定了系统的最佳运行点。研究表明，多孔材料能显著改善直管和螺旋管的传热效果。最佳性能在达西数较高时实现，传热与 Re 无关或相关。在 Da=0.1 和 Re=2000 时，最高 Nu 值约为 450，分别是无多孔材料直管和螺旋管中 Nu 值的 103 倍和 17 倍。然而，多孔填充直管和无孔螺旋线圈的 PEC 峰值分别为 2 和 17。这项研究的主要成果表明，在特定条件下，多孔介质可用于放大螺旋管中二次流旁的传热。当使用高 Da 数（如 Da ~ 0.1）的多孔介质时，这种增强作用就会出现。与此相反，研究表明，使用低渗透率（Da ~ 0.0001）的多孔介质可以超越二次流的效果，在这种情况下，多孔填充螺旋管和直管的热性能都会有所提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Porous Media 工程技术-工程：机械

CiteScore

3.50

自引率

8.70%

发文量

审稿时长

12.5 months

期刊介绍： The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.