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Modelling of mass transfer in extraction columns with drop forward‐mixing and coalescence‐redispersion
Author(s) -
Qian Yu,
Wang Jiading
Publication year - 1992
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450700113
Subject(s) - mass transfer , drop (telecommunication) , coalescence (physics) , countercurrent exchange , mechanics , continuous phase modulation , sieve (category theory) , mass transfer coefficient , chemistry , chromatography , thermodynamics , mathematics , computer science , physics , engineering , mechanical engineering , telecommunications , combinatorics , astrobiology
The objective of this work is to model the effect of simultaneous drop forward‐mixing and coalescence‐redispersion on the hydrodynamics and mass transfer efficiency of a two phase countercurrent extraction process. Based on the flow mechanism and drop size distribution in extraction columns, a novel model with a simplified sequential algorithm is developed. It is much easier to use, and computationally less expensive, than a direct simulation technique which would typically be a tedious boundary‐value iteration method. A new concept of Effective Mass Transfer Coefficient is presented, from which the effect of drop forward‐mixing and coalescence‐dispersion on extraction performance is directly evaluated from an analytical expression. The results calculated from the model are satisfactorily compared to experimental results obtained from three actual extraction system in two pulsed sieve‐plate extraction columns. The relationship between the present model and the diffusion model is discussed and a parameter transformation equation for the two models is given.