Measurement of Effective Diffusion Coefficient in Porous Media using the Naphthalene Sublimation

IF 2.6 3区工程技术 Q3 ENGINEERING, CHEMICAL

Transport in Porous Media Pub Date : 2025-08-20 DOI:10.1007/s11242-025-02216-x

Alireza Shahyad, Behnam Khoshandam

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Abstract

Applications of porous media are increasing in various scientific disciplines, such as energy storage or conversion systems and giant capacitors. It has been recognized that the transport and reaction processes occurring within pores significantly influence the performance of porous media, while transport phenomena at the pore scale are not well-characterized. The experimental effective diffusion coefficient of naphthalene-nitrogen was studied using a regression method based on a radial dimension transient model of diffusion in the porous medium. The weight of samples containing naphthalene was continuously recorded by a digital precision balance. This study was performed at three different temperatures: 303.15 K (30 °C), 323.15 K (50 °C), and 343.15 K (70 °C) at atmospheric pressure, with porous metal matrices of 90% porosity containing different amounts of naphthalene in a laminar nitrogen stream. The fitting of the diffusion equation in spherical coordinates and the weight changes provided the mass transfer coefficients; as a result, a power correlation to estimate the effective diffusion coefficient was obtained.

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用萘升华法测量多孔介质中的有效扩散系数

多孔介质在各种科学领域的应用越来越多，如能量存储或转换系统和巨型电容器。人们已经认识到，发生在孔隙内的输运和反应过程对多孔介质的性能有显著影响，而孔隙尺度上的输运现象尚未得到很好的表征。采用基于径向尺度多孔介质瞬态扩散模型的回归方法，研究了萘氮在多孔介质中的有效扩散系数。用数字精密天平连续记录含萘样品的重量。本研究在303.15 K（30°C）、323.15 K（50°C）和343.15 K（70°C）三种不同温度下进行，在层流氮流中使用孔隙率为90%的多孔金属基质，其中含有不同量的萘。球坐标下扩散方程的拟合和质量变化提供了传质系数；得到了估算有效扩散系数的幂相关函数。

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来源期刊

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).