充填床上湍流的渗透率依赖性

IF 2.6 3区 工程技术 Q3 ENGINEERING, CHEMICAL
Kazuhiko Suga, Masatoshi Era, Yusuke Kuwata
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引用次数: 0

摘要

为了表征孔隙度为\(\varphi <0.5\)的多孔介质上的湍流,我们制造了三种类型的填充床:立方体填充的球体(案例S)、随机填充的米粒状颗粒(案例E)和碎石(案例C),测量的孔隙度分别为\(\varphi =0.45\)、0.37和0.30。在测量了它们的渗透率后,在渗透率雷诺数(\(Re_K\))为2.1 ~ 18.3的条件下,对流动进行了颗粒图像测速(PIV)测量。然后将结果与Suga等人报道的孔隙率为\(\varphi \simeq 0.8\)的泡沫陶瓷上的湍流流动数据进行比较(Int J Heat Fluid Flow 31(6), 974-984, 2010)。对测量的湍流特性进行了分析,以检查它们与\(Re_K\)的相关性,并评估统一标度方法在大范围多孔床上的适用性。研究结果表明,虽然一些分布曲线通常遵循\(Re_K\),但仅该参数不足以作为填料床湍流的通用标度因子,因为粗糙度标度也表现出对表面形状的显著依赖,而不是孔隙度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Permeability Dependency of Turbulence Over Packed-Beds

Permeability Dependency of Turbulence Over Packed-Beds

Permeability Dependency of Turbulence Over Packed-Beds

To characterize turbulence over porous media with porosities \(\varphi <0.5\), three types of packed-beds were manufactured: cubically packed spheres (case S), randomly packed rice-grain-shaped pellets (case E), and crushed stones (case C), with measured porosities of \(\varphi =0.45\), 0.37, and 0.30, respectively. After measuring their permeabilities, particle image velocimetry (PIV) measurements were conducted for flows under conditions characterized by the permeability Reynolds number (\(Re_K\)) ranging from 2.1 to 18.3. The results were then compared with previous data on turbulent flows over foamed ceramics with a porosity of \(\varphi \simeq 0.8\), reported by Suga et al. (Int J Heat Fluid Flow 31(6), 974–984, 2010). The measured turbulence characteristics were analyzed to examine their correlation with \(Re_K\) and to evaluate the applicability of a unified scaling approach across a wide range of porous beds. The findings suggest that while some distribution profiles generally follow \(Re_K\), this parameter alone is insufficient as a universal scaling factor for turbulence over packed-beds, as the roughness scale also exhibits significant dependence on surface shape rather than the porosity.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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