کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
216132 | 1426274 | 2011 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Form of multicomponent Fickian diffusion coefficients matrix Form of multicomponent Fickian diffusion coefficients matrix](/preview/png/216132.png)
The form of multicomponent Fickian diffusion coefficients matrix in thermodynamically stable mixtures is established based on the form of phenomenological coefficients and thermodynamic factors. While phenomenological coefficients form a symmetric positive definite matrix, the determinant of thermodynamic factors matrix is positive. As a result, the Fickian diffusion coefficients matrix has a positive determinant, but its elements — including diagonal elements — can be negative. Comprehensive survey of reported diffusion coefficients data for ternary and quaternary mixtures, confirms that invariably the determinant of the Fickian diffusion coefficients matrix is positive.
► Irreversible thermodynamics establishes form of multicomponent diffusion coefficients.
► Phenomenological coefficients and thermodynamic factors affect sign of diffusion coefficients.
► Negative diagonal elements of diffusion coefficients matrix can occur in non-ideal mixtures.
► Eigenvalues of the matrix of Fickian diffusion coefficients may not be all real.
Journal: The Journal of Chemical Thermodynamics - Volume 43, Issue 8, August 2011, Pages 1192–1203