MASS TRANSFER TO MICROPARTICLES IN AGITATED SYSTEMS

摘要: Mass transfer to microparticles in agitated vessels was measured experimentally establish both the turbulent and asymptotic molecular diffusion contributions. Prior studies specifically focused on transport microparticles, defined as those whose size is comparable or smaller than Kolmogoroff minimum eddy size, are limited. Further, some cases, earlier work that a value for Sherwood number of less 2 could be obtained. The contribution from dissolution 1.3- 4-μm AgCl crystals aqueous KCl solutions, exchange Ag+ ions with 9-μm ion particles. These results represent first systematic experimental confirmation theoretical limit number=2 valid spherical particles suspended stirred tanks. determined measurements rate particles, 6 420 μm diameter, glycerol solutions. mass coefficient can well correlated by expression where Re = (ed4/gs3)13. compatible boundary layer model origin decaying microeddies. This equation also correlates reliable which found literature. A comparison proposed previous correlations macroparticles, extrapolated into microparticle regime, suggests use macroparticle significantly underestimate transfer.