Water Transport in Electrolyte Membranes

Water transport flux owing to electro-osmotic drag in a cell with operating current density i is given as 

Water flux owing to the pressure-driven convection flow is given as 

Substituting Equation 7.71 into Equation 7.70, we have the expression for water flux owing to convection as 

A combination of all these effects leads to the net water flux as 

Equation 774 is referred to as the generalized form of the Nernst-Planck s equation. 

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