Penetration theory
Most of the industrial processes of mass transfer is unsteady state process. In such cases, the contact time between phases is too short to achieve a stationary state. This non…
THEORIES OF MASS TRANSFER
Many theories are available to explain the behavior of mass transfer coefficient such as the film, penetration, surface renewal and others. The theories are based on both molecular and turbulent…
Mass transfer coefficient in hollow-fiber membrane module
Hollow-fiber membrane modules are extensively used in various membrane separation processes including gas separation, reverse osmosis, filtration and dialysis. In this module a bundle of randomly packed fibers are enclosed…
Correlation of mass transfer coefficients for single cylinder
Bedingfield and Drew (1950) studied the sublimation from a solid cylinder into air which is flowing normal to its axis. They developed a correlation for the mass transfer coefficient from…
CORRELATION FOR CONVECTIVE MASS TRANSFER COEFFICIENT
In this section various correlations that are used to estimate the convective mass transfer coefficients for various cases are presented. The various correlations are generally formed in terms of different…
MASS TRANSFER COEFFICIENTS
Movement of the bulk fluid particles in the turbulent condition is not yet thoroughly understood. For gases it is fairly well known as a molecular diffusion since it is described…
Unsteady state Diffusion
If the change of concentration of a component A of the diffusive constituents in a mixture occurs over a time at a point, the Fick’s law of diffusion at unsteady…
FICK’S LAW OF DIFFUSION
Adolf Fick (1955) first described the molecular diffusion in an isothermal, isobaric binary system of components A and B. According to his idea of molecular diffusion, the molar flux of…
What Is Mass Transfer?
Mass transfer describes the transport of mass from one point to another and is one of the main pillars in the subject of Transport Phenomena. Mass transfer may take place…
Combined Convection and Conduction
This combination is likely to occur with the use of extended surfaces where the primary surface exchanges heat by convection to the adjacent fluid flow and by conduction through the…
