In the present study, hydrodynamics of laboratory-scale asymmetric rotating impeller column (ARIC) and asymmetric rotating disk column (ARDC) have been studied. Effect of physical properties and operating parameters on drop size, dispersed phase holdup and axial mixing have been investigated. Correlations for prediction of mean drop size and holdup have been developed, in terms of power consumption per unit volume. The average absolute value of relative error (AARE) values in the prediction of drop size and holdup using these correlations are 18% and 14%, respectively. Furthermore, the hydrodynamic characteristics of ARIC have been compared with that of ARDC. Mass transfer performance of ARIC for the extraction of metal ions from phosphoric acid has been investigated. Effect of impeller speed on percentage extraction and continuous phase overall mass transfer coefficient has been examined. This work provides an insight into the performance of asymmetric rotary agitated extraction columns, useful in the design of such columns.
In the present work, a computational fluid dynamics (CFD) methodology has been applied to study the hydrodynamics of two phase flow in an asymmetric rotating disk contactor (ARDC) and asymmetric rotating impeller column (ARIC). The Euler–Euler model for multiphase flow and mixture k–ε model for turbulence have been used. The effect of different drag models on holdup of the dispersed phase has been investigated. The Kumar and Hartland (KH) drag model has been modified to predict the holdup accurately. The results of simulation have been validated with published experimental data. The average error in the prediction of holdup using a modified KH drag model is within ±11% of the experimental values. Hydrodynamics of ARDC and ARIC have been compared using simulations at different agitator speeds. The fraction of static holdup in ARDC and ARIC has been quantified. The developed CFD model has been used to predict the residence time distribution (RTD) of the dispersed phase.
In the present work, hydrodynamics and mass transfer performance of the asymmetric rotating impeller column (ARIC) of different scales, that is, ARIC 1 (I.D. = 0.1 m), ARIC 2 (I.D. = 0.22 m), and ARIC 3 (I.D. = 0.3 m), have been investigated. The liquid−liquid system used in the present study is phosphoric acid containing metal ions and the organo-phosphorous solvent. The effect of different operating conditions on regime transition in ARIC of different scales has been analyzed. Correlations have been developed for the prediction of holdup and drop size in the ARIC of different scales. The average absolute relative error values in the prediction of holdup and drop size using these correlations are 10 and 9%, respectively. An increase in the height of transfer unit is observed with an increase in throughput and column diameter. The results indicate that adequate design and scale-up of extraction columns can be carried out based on geometric similarity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.