Hello, I'm doing an experiment where I will be blowing warm air parallel to a stagnant water surface, and I will investigate the scaling of air velocity with mass transfer coefficient. I am trying to find some kind of scaling of the concentration boundary layer thickness with air velocity, and have been unable to find any literature that gives that scaling. Anyone know what that relationship is, or where I can find it? Thanks. I should note I have found derivations of the momentum boundary layer thickness, but not the concentration. Perhaps there is some correlation between momentum and concentration boundary layer thickness?