Interphase transfer, analysis

When Ugo > af o, it is necessary to insert a discontinuity in the flow in order to obtain a solution to the inviscid conservation equations. Across the discontinuity, all interphase transfer processes are effectively frozen and hence no changes occur in droplet radius, temperature and velocity. The vapour phase conditions donwstream of the discontinuity are easily calculated by a standard Rankine-Hugoniot analysis and these provide the initial conditions for the numerical integration procedure. 

Static mixing of immiscible Hquids can provide exceUent enhancement of the interphase area for increasing mass-transfer rate. The drop size distribution is relatively narrow compared to agitated tanks. Three forces are known to influence the formation of drops in a static mixer shear stress, surface tension, and viscous stress in the dispersed phase. Dimensional analysis shows that the drop size of the dispersed phase is controUed by the Weber number. The average drop size, in a Kenics mixer is a function of Weber number We = df /a, and the ratio of dispersed to continuous-phase viscosities (Eig. 32). 

Jean-Claude Charpentier, Mass-Transfer Rates in Gas-Liquid Absorbers and Reactors Dee H. Barker and C. R. Mitra, The Indian Chemical Industry-lts Development and Needs Lawrence L. Tavlarides and Michael Stamatoudis, The Analysis of Interphase Reactions and Mass Transfer in Liquid-Liquid Dispersions... 

The interfacial diffusion model of Scott, Tung, and Drickamer is somewhat open to criticism in that it does not take into account the finite thickness of the interface. This objection led Auer and Murbach (A4) to consider a three-region model for the diffusion between two immiscible phases, the third region being an interface of finite thickness. These authors have solved the diffusion equations for their model for several special cases their solutions should be of interest in future analysis of interphase mass transfer experiments. 

THE ANALYSIS OF INTERPHASE REACTIONS AND MASS TRANSFER IN LIQUID-LIQUID DISPERSIONS... 

If the adsorption equilibrium is not attained instantaneously, a different analysis is needed. Toei et al. (T18) studied the mechanism of heat and mass transfer between bubbles and emulsion phase under such circumstances. The dependence of diffusion rate on bulk flow across the bubble interface also becomes important when coarse particles are fluidized (H16). For two-dimensional bubbles Chavarie and Grace (C7a) compared various interphase mass-transfer models. 

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