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• W2003262829 abstract "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.On se propose dans cet article de modeliser l'effet simultane du melange des gouttes et de la coalescence-redispersion sur l'hydrodynamique et l'efficacite du transfert de matiere d'un precede d'extraction a contre-courant biphasique. En s'appuyant sur le mecanisme d'ecoulement et la distribution de taille des gouttes dans les colonnes d'extraction. on a mis au point un nouveau modele base sur un algorithme sequentiel simplifie. Ce modele est beaucoup plus facile a utiliser, et moins cher en termes de temps de calcul, qu'une technique de simulation directe qui serait typiquement une methode d'iteration de valeurs aux limites fastidieuse. On presente un nouveau concept de coefficient de transfert de matiere efficace, a partir duquel l'effet du melange des gouttes et de la coalescence-dispersion sur la performance de l'extraction est directement evalue au moyen d'une expression analytique. Les resultats calcules se comparent bien aux resultats experimentaux obtenus a partir de trois systemes d'extraction reels dans deux colonnes d'extraction a plateaux perfores pulses. La relation entre le present modele et le modele de diffusion est analysee et on donne une equation de transformation des parametres pour les deux modeles." @default.
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• W2003262829 date "1992-02-01" @default.
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• W2003262829 title "Modelling of mass transfer in extraction columns with drop forward-mixing and coalescence-redispersion" @default.
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• W2003262829 doi "https://doi.org/10.1002/cjce.5450700113" @default.
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