Rapid determination of diffusivity in massive anisotropic porous materials
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DOI: 10.1134/S0869864320020110
Rapid determination of diffusivity in massive anisotropic porous materials V.P. Belyaev1, S.V. Mishchenko2, and P.S. Belyaev2, a 1
Roskhimzashchita Corporation, Tambov, Russia
2
Tambov State Technical University, Tambov, Russia
E-mail: [email protected] a (Received May 29, 2019; revised September 5, 2019; accepted for publication November 6, 2019) A method for rapid determination of diffusion coefficients of polar solvents in anisotropic porous materials, making it possible to control the state of products prepared from such materials without destruction, is reported. For implementation of the proposed method, no preliminary calibration of the local solvent concentration in solid phase for the used converter and each new “porous material-solvent” system is required; that circumstance largely increases the research productivity of the method. The method possesses flexibility in terms of the possibility for measuring the values involved in the calculation expression on curve sections with a high sensitivity to parameter changes and in the range with a stable and noise-protected output signal of the concentration converter, which fact ensures an in-creased control accuracy. Keywords: non-destructive testing, uniaxially reinforced products, porous material, diffusion coefficient, anisotropy.
Introduction The development of modern high-tech industries is closely related to the use of new porous materials, whose qualitative characteristics depend on the characteristics of the masstransfer processes of liquid and gaseous media, as well as transformations proceeding at the phase boundary [1–3]. Intensive studies aimed at the search of promising technological solutions and the development of modifiers lead to the emergence of a profound number of new composite materials [4]. Evaluation of the effectiveness of the modifiers is often determined by the ability to ensure the transfer of mass of the target components in the pore system, this transfer being characterized by a diffusion coefficient. Currently, products in the form of blocks or panels prepared from fibrous composite materials are often used [5, 6]; such products exhibit a substantial anisotropy of their properties due to the forced formation or random orientation of the fibers in the fabricated products [5–7]. Due to the presence of specific properties, uniaxially reinforced composite materials have gained wide acceptance and, consequently, the development of promising technologies for their preparation has been noticeably activated [4, 8–11]. For determining the diffusivity of diffusing substances in composite materials, methods involving the measurement of spatial distributions of those substances are most often used [12–14]. V.P. Belyaev, S.V. Mishchenko, and P.S. Belyaev, 2020
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V.P. Belyaev, S.V. Mishchenko, and P.S. Belyaev
Currently, significant successes have been achieved in the studies of heat- and mass-transfer processes. Modern methods making it possible to continuously measure the spatial distributions of dif
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