Analysis of extractor performance. II. Longitudinal mixing of the continuous liquid in a two-phase system

Haman, Janto; Míšek, T.

doi:10.1016/0300-9467(88)80085-6

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…The magnitude of the D ax for this case is 1.8 × 10 –4 m 2 /s, which is 20% higher than that observed for a single phase at a similar impeller speed. This increase in D ax for two-phase conditions can be attributed to the increase in turbulence level and entrainment of the continuous phase in the eddies, formed in the wakes attached to the rear of drops …”

Section: Resultsmentioning

confidence: 98%

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Scale-Up Study on the Performance of the Asymmetric Rotating Impeller Extraction Column

Hendre

Hinge

Patwardhan

2021

Ind. Eng. Chem. Res.

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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.

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Section: Resultsmentioning

confidence: 98%

“…This increase in D ax for two-phase conditions can be attributed to the increase in turbulence level and entrainment of the continuous phase in the eddies, formed in the wakes attached to the rear of drops. 40 3.4.1. Effect of the Scale on Axial Mixing.…”

Section: Axial Mixing Studymentioning

confidence: 99%

Scale-Up Study on the Performance of the Asymmetric Rotating Impeller Extraction Column

Hendre

Hinge

Patwardhan

2021

Ind. Eng. Chem. Res.

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“…Both phases pass through these zones in a counter-current direction. Several experimental studies have been carried out to understand the performance of ARDC. − These studies have focused on the holdup, drop size distribution, and axial dispersion. Few researchers have developed empirical correlations for these parameters based on a wide range of experimental data. , …”

Section: Introductionmentioning

confidence: 99%

CFD Simulations of Two Phase Flow in Asymmetric Rotary Agitated Columns

Farakte

Hendre

Patwardhan

2018

Ind. Eng. Chem. Res.

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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.

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Prediction of axial mixing coefficients in rotating disc and asymmetric rotating disc extraction columns

Kumar

Hartland

1992

Can J Chem Eng

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The correlation of axial mixing in the continuous and dispersed phases of rotating disc and asymmetric rotating disc columns is presented. Published experimental results on continuous‐phase axial mixing for both single‐ and two‐phase flows, obtained with tracer injection methods and by solute concentration profiles, are considered. The correlation developed is based on 1055 data points for 32 liquid systems obtained by 19 different investigators. The axial mixing in rotating disc columns is found to be up to 20% larger than in asymmetric rotating disc columns. Data for the dispersed phase are harder to correlate than those for the continuous phase. Since the available results are often contradictory, the correlation for the dispersed‐phase coefficient is thus less accurate than that for the continuousphase coefficient.

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Analysis of extractor performance. II. Longitudinal mixing of the continuous liquid in a two-phase system

Cited by 6 publications

References 6 publications

Scale-Up Study on the Performance of the Asymmetric Rotating Impeller Extraction Column

Scale-Up Study on the Performance of the Asymmetric Rotating Impeller Extraction Column

CFD Simulations of Two Phase Flow in Asymmetric Rotary Agitated Columns

Prediction of axial mixing coefficients in rotating disc and asymmetric rotating disc extraction columns

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