Question: Derive an expression representing the concentration profile through a thin film ( of thickness L ) , in steady state from the general equation of

Derive an expression representing the concentration profile through a thin film

(

of thickness

L),

in steady state from the general equation of Fick's second law. Assume constant solute concentrations on both surfaces of the film, establishing a concentration gradient

C = (C 2 - C 1),

where

C 2 > C 1 .

Write the expression to calculate the flux and illustrate in a drawing the concentration profile and the direction of the flow. Express the associated driving force and resistance.

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