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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.

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References