Mixing concepts, fundamentals Process results

The description of the interfacial transport processes in terms of mass transfer coefficients is an approximate engineering concept that normally results in simpler mathematical problems than the alternative description in terms of the more fundamental Pick s law. The definition of the mass transfer coefficient is thus based on an oversimplified picture of the actual physics. The mass transfer coefficient concept relies on the hypothesis that the changes in concentrations are limited to two hypothetical stagnant films, one on each side of the stagnant interface. The transfer flux is thus transfering mass between the interface and the well mixed bulk solution. The amount of matter transferred is expected to be proportional to the concentration difference and the interfacial area. The proportionality coefficient, kc, is called... 

---