{"title":"Diffusion and Thermal Diffusion Coefficients of a Binary Mixture in the Van der Waals Model","authors":"A. B. Medvedev","doi":"10.1134/s0010508224010155","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Model expressions are obtained for the concentration diffusion coefficient and thermal diffusion factor of a binary mixture obeying the Van der Waals equation of state. Model calculations at elevated pressure (density) require the equation of state parameters and thermal diffusion factor of the mixture in a low-density ideal gas state. The behavior of the model relations is studied as a function of pressure along isotherms. Near the critical state, the model diffusion coefficient has a minimum and the thermal diffusion coefficient has a maximum. The diffusion and thermal diffusion models at elevated pressure are compared with experimental data for a number of mixtures. It is shown that they are in qualitative and generally quantitative agreement at different temperatures and component concentrations. The Van der Waals equation is not quite suitable for describing experimental data on compressibility and phase equilibrium at high pressure. This requires more complex and flexible modifications of the equation. Generalized expressions are given for model diffusion characteristics of the binary mixture in the case of such equations of state.</p>","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"115 1","pages":""},"PeriodicalIF":0.9000,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Combustion, Explosion, and Shock Waves","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1134/s0010508224010155","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
Model expressions are obtained for the concentration diffusion coefficient and thermal diffusion factor of a binary mixture obeying the Van der Waals equation of state. Model calculations at elevated pressure (density) require the equation of state parameters and thermal diffusion factor of the mixture in a low-density ideal gas state. The behavior of the model relations is studied as a function of pressure along isotherms. Near the critical state, the model diffusion coefficient has a minimum and the thermal diffusion coefficient has a maximum. The diffusion and thermal diffusion models at elevated pressure are compared with experimental data for a number of mixtures. It is shown that they are in qualitative and generally quantitative agreement at different temperatures and component concentrations. The Van der Waals equation is not quite suitable for describing experimental data on compressibility and phase equilibrium at high pressure. This requires more complex and flexible modifications of the equation. Generalized expressions are given for model diffusion characteristics of the binary mixture in the case of such equations of state.
期刊介绍：
Combustion, Explosion, and Shock Waves a peer reviewed journal published in collaboration with the Siberian Branch of the Russian Academy of Sciences. The journal presents top-level studies in the physics and chemistry of combustion and detonation processes, structural and chemical transformation of matter in shock and detonation waves, and related phenomena. Each issue contains valuable information on initiation of detonation in condensed and gaseous phases, environmental consequences of combustion and explosion, engine and power unit combustion, production of new materials by shock and detonation waves, explosion welding, explosive compaction of powders, dynamic responses of materials and constructions, and hypervelocity impact.
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