Chemical Potential and Equilibrium Concentration of Solute Under the Influence of an Applied Microwave Field
The negative gradient of chemical potential in solution is the driving force of solute diffusion,so the chemical potential of solute due to the effect of microwaves is an important physical quantity for studying on mass transfer enhancement with microwave field.Based on the thermodynamic theory and the principle of electromagnetic wave propagation in medium,an expression about the chemical potential of solute in directed radiation of microwave field,with the dependence on the incidence depth of microwaves and the physical parameters of molecules was derived.And then used the changing rule of chemical potential under the influence of an applied microwave field,the relationship between the equilibrium concentration of solute and the incidence depth of microwaves is obtained.The conclusion in this paper could enrich the mass transfer enhancement theory under the influence of an applied microwave field,and it could also provide a theoretical guide to the industrialization of microwave-assisted extraction of effective compounds from Chinese herbs.