Agitation. Performance of Propellers in Liquid-Solid Systems

Abstract

Previously derived relations are applied to a study of the rate of dissolution of solids in liquids in a series of geometrically similar vessels fitted with propeller stirrers. It is found that the dissolution constant, K, for any particular liquid-solid system under isothermal conditions is a function of the product of speed and size factor, nd, and this relation holds for several different agitator designs. The results for four liquid-

Particle-liquid mass transfer in mechanically agitated contactors

“…A number of investigators have concluded that kSL = D°•8 (Hixson and Baum, 1942;Barker and Treybal, 1962;Sykes and Gomezplata, 1967;Boon-long et al, 1978) whereas others (Brian et al, 1960;Miller, 1971;Sano et al, 1974;Sicardi et al, 1979;Conti and Sicardi, 1982;Lai et al, 1988; Armenante and Kirwan, 1989) have observed the dependence to be closer to Z)°•67. The approximate square root dependence of kst on D obtained in this work and by other investigators agrees with the penetration model for diffusion in turbulent systems and is thus likely to be more appropriate to the present situation dealing with a highly turbulent field.…”

Mass transfer coefficients for solids suspended in agitated liquids

“…The effect of speed for fully suspended particles has ranged from no (1,8,12,20) to no." (6), as well as intermediate effects (3,11,16,12,14,7 ) .…”

Particle‐liquid mass transfer in three phase sparged reactor

“…A number of workers have concluded that Sh a Sco.' (Hixson and h u m , 1941;1942;Barker and Treybal, 1960;Sykes and Gomezplatta, 1967;Boon-Long et al, 1978) whereas others (Calderbank and Jones, 1961;Marangozis and Johnson, 1961;Harriott, 1962) have observed the dependence to be closer to Sc ". for 0.00154 I dp I 0.00368 m. The above equations also give excellent correlations of the data with standard deviations of 4.2% and 2.9%, respectively.…”