Abstract
The asymmetric property of the nonlinear chemical affinity equation is shown to result in a diffusive flux augmentation effect, due to nonlinear chemical reaction rate, that is dependent on the direction in which the reaction is displaced from equilibrium. Because of this, a film when coupled with an external driving force can act as a “chemical pump”. A simple model is suggested for a quasi steady pump of this type which provides maximum pumping effect when the film thickness is in the range of eight to ten times the mean characteristic diffusion reaction length.
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