Vignes equation

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Description

Used for non-electrolyte concentrated solutions.

For ideal liquid mixtures of unassociated components A and B, Vignes recommended the following relationship: $$ D_{AB} = ({D_{AB}})^{X_B}({D_{BA}})^{X_A} $$

Where $$D_{AB}$$ is the diffusion coefficient of A in B at infinite dilution, $$D_{BA}$$ is the diffusion coefficient of B in A at infinite dilution, and $$X_A$$ and $$ X_B$$ the mole fractions of components A and B, respectively.

References

  • WELTY, James; WICKS, Charles E.; WILSON, Robert E.; RORRER, Gregory L. Fundamentals of Momentum, Heat and Mass Transfer. 5th Ed. John Wiley & Sons, 2008.