BASIC MODELS FOR MASS TRANSFER.

Upon completion of this instructive module, the student should be able to demonstrate an understanding of the basic models of mass transfer through an ability to: define the two-film model, penetration model, surface renewal model and film-penetration model, noting the differences; write the mass transfer equations and the boundary condition for a given process, once it has been decided which model to use; calculate the mass transfer coefficient for absorption of a gas in a system, given the mass transfer coefficient for another gas in the same system and the diffusivities of both gases in the liquid used; and explain and predict the effect of turbulence, temperature, liquid viscosity, etc. , on the mass transfer rates, in terms of the parameters of each model.