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Diffusion in high viscosity liquids
Author(s) -
Hiss Timothy G.,
Cussler E. L.
Publication year - 1973
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690190404
Subject(s) - thermodynamics , dilution , viscosity , diffusion , chemistry , solvent , shearing (physics) , hydrocarbon , hexane , exponent , analytical chemistry (journal) , chromatography , physics , organic chemistry , linguistics , philosophy
Abstract The diffusion coefficients D of n ‐hexane and of naphthalene in a series of hydrocarbon liquids with viscosities μ from 5 · 10 −4 to 5 kg m −1 sec −1 (0.5 to 5000 centipoise) have been measured at 25°C with a one Savart plate wavefront‐shearing interferometer. This apparatus allows direct determinations at effectively infinite dilution. The values obtained suggest that for a small solute diffusing in a large solvent\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {D\mu ^{2/3} } & = & {{\rm constant}} \\ \end{array} $$\end{document}a result consistent with earlier studies. The exponent of 2/3 may be rationalized on the basis of the Eyring rate theory.