Chemical Engineering. Mass Transfer Operation. L Mass transfer coefficients in turbulent flow - Penetration and surface renewal theory. L Problems on Dimensionless numbers and correlations. L Thermodynamics of liquid liquid extraction Type 2 system. Ended on Mar 6,
GATE & ESE - L Penetration and surface renewal theory Offered by Unacademy
In such cases, the contact time between phases is too short to achieve a stationary state. This non stationary phenomenon is not generally taken into account by the film model. In the absorption of gases from bubbles or absorption by wetted-wall columns, the mass transfer surface is formed instantaneously and transient diffusion of the material takes place. Figure 3. Basic assumptions of the penetration theory are as follows: 1 Unsteady state mass transfer occurs to a liquid element so long it is in contact with the bubbles or other phase 2 Equilibrium exists at gas-liquid interface 3 Each of liquid elements stays in contact with the gas for same period of time Figure 3.
Mass transfer in reactive and non-reactive multiphase systems is of vital importance in chemical, petrochemical, and biological engineering applications. In this chapter, theories and models of mass transfer in gas-liquid, gas-solid and gas-liquid-solid systems with and without chemical reactions are briefly reviewed. Literature data on the mass transfer characteristics in multiphase reactors over the last two decades with applications to the Fischer-Tropsch F-T synthesis are summarized.
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