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Surface phenomena and mass transfer rates in liquid‐liquid systems: Part 2
Author(s) -
Javed Khalid H.,
Thornton John D.,
Anderson Terry J.
Publication year - 1989
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690350708
Subject(s) - mass transfer , marangoni effect , chemistry , mass transfer coefficient , contactor , thermodynamics , aqueous solution , toluene , analytical chemistry (journal) , chromatography , surface tension , organic chemistry , power (physics) , physics
Simultaneous measurements of mass transfer rates to quasisteady‐state pendant aqueous droplets and rates of surface renewal due to Marangoni effects have been carried out using the water/toluene system with acetone as solute. The surface renewal measurements were made with the photochromic dye tracer technique reported earlier (Thornton and Anderson, 1981; Thornton et al., 1985). Both the mass transfer coefficients and the rates of surface renewal have been shown to be dependent upon the age of the droplet interface and the solute concentration in the continuous phase. Thus, coefficients of a young droplet are high initially, but decrease with time and approach a constant value, dependent upon solute concentration, as the interface ages. This parallel decrease in both interfacial (Marangoni) activity and transfer rates with time has also been observed (Rogers et al., 1987) with inorganic solutes such as uranyl nitrate and has implications for contactor design.