Diffusion and Thermal Diffusion Coefficients of a Binary Mixture in the Van der Waals Model
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Abstract
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.
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OpenAlex topics: Field-Flow Fractionation Techniques · Phase Equilibria and Thermodynamics · Chemical Thermodynamics and Molecular Structure
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