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Self-diffusion in liquids predicted by a theory of flow through granular media

✍ Scribed by Jerzy P. Sęk

Publisher
American Institute of Chemical Engineers
Year
1996
Tongue
English
Weight
558 KB
Volume
42
Category
Article
ISSN
0001-1541

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✦ Synopsis

A new semiempirical model for prediction of self-difision phenomena in liquids is proposed. Assuming analogy between the concept of a free volume in liquids and a porosity of a granular medium, a capillary model of the granular bed and the Kozeny-Carman theory was applied to determine self-difision coeficients in liquids. The dimensionless free volume in liquids was evaluated using a combination of the proposed dependence and an appropriate formula available in the literature. The new model was tested for 89 sets of data concerning self-difision of different chemical substances at several values of a temperature. The average error of a prediction was between & 1% and about 3% for some data points.

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Prediction of solvent-diffusion coeffici
Prediction of solvent-diffusion coefficient in polymer by a modified free-volume theory
✍ W. H. Jiang; R. Han 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 190 KB 👁 3 views

Several versions of free-volume theory have been proposed to correlate or predict the solvent diffusion coefficient of a polymer/solvent system. The quantity of free volume is usually determined by the Williams-Landel-Ferry (WLF) equation from viscosity data of the pure component in these theories.