Film Theory Mass Transfer. The steady state mass transfer flux through the liquid film can be described according to the film theory by equation 5. Postulates that two non turbulent fictitious films are present on either side of the interface between thw film mass transfer across these films purely occurs molecular diffusion.
In the turbulent flow the mass transfer coefficient is proportional to n d n ab where n may be zero to 09 depending upon the operating conditions. Higbie in 1935 and the theory is called higbies penetration theory. The mechanisms and rate expressions for this transfer process have been conceptualized in a variety of ways so that quantitative descriptions are possible.
Superficial molar liquid velocity fg.
5 and by considering only the flux due to molecular diffusion eq. Superficial molar liquid velocity fg. Mass transfer occurs in a thin film or boundary layer. Gradients in the boundary tangential direction are negligible compared to boundary normal gradients.