Mass transfer coefficient high-shear interface

I-power dependence of the dimensionless mass transfer coefficient on Re reveals fbat the flow regime is laminar. Turbulent mass transfer across high-shear no-slip interfaces also scales as Shaverage Sc, but the exponent of Re in this correlation is somewhere between 0.8 and 1. AU of these dimensionless scaling laws for interphase mass transfer are summarized in Table 12-1 for solid-liquid and gas-Uquid interfaces. 

The interphase mass transfer coefficient of reactant A (i.e., a,mtc), in the gas-phase boundary layer external to porous solid pellets, scales as Sc for flow adjacent to high-shear no-slip interfaces, where the Schmidt number (i.e., Sc) is based on ordinary molecular diffusion. In the creeping flow regime, / a,mtc is calculated from the following Sherwood number correlation for interphase mass transfer around solid spheres (see equation 11-121 and Table 12-1) ... 

For laminar flow adjacent to a high-shear no-slip solid-liquid interface, with one-dimensional flow in the mass transfer boundary layer, the mass transfer coefficient fcA.MXc is obtained from the following Sherwood number correlation (see steps 17 and 18 of Problem 23-7 an page 653, particularly the scaling law exponents a and b) ... 

Eductor mixers introduce the air through tiny holes in the throat of small venturis installed on separate pipes transferring the liquor from the delay tank to the oxidizer. The large shear force at the air-liquor interface provides a high mass-transfer coefficient between the oxygen and the liquor. The air then bubbles upward through the oxidizer to accomplish the. sulfur flotation (Vancini and Lari, 1985). 

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