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<p>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&#xa0;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&#xa0;K (30&#xa0;°C), 323.15&#xa0;K (50&#xa0;°C), and 343.15&#xa0;K (70&#xa0;°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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Alireza Shahyad,
  • Behnam Khoshandam

摘要

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.