Diffusion through a stagnant gas film

Input(s)

$\boldsymbol{x}_{\boldsymbol{B} \mathbf{1}}$: Mole Fraction of B1 (fraction)

$\boldsymbol{x}_{\boldsymbol{B} \mathbf{2}}$: Mole Fraction of B2 (fraction)

Output(s)

$\boldsymbol{x}_{\boldsymbol{B}}$: Average Value of Mole Fraction of B in the Logarithmic Mean of Thermal Concentrations (fraction)

Formula(s)

$$ \mathrm{x}_{\mathrm{B}}=\left(\mathrm{x}_{\mathrm{B} 2}-\mathrm{x}_{\mathrm{B} 1}\right) / \ln \left(\mathrm{x}_{\mathrm{B} 2} / \mathrm{x}_{\mathrm{B} 1}\right) $$

Reference(s)

Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second Ed.). John Wiley \& Sons, Chapter: 18, Page: 547.