Experimental investigations of liquid–liquid disengagement in a continuous gravity settler

Thaker, Abhijeet H.; Darekar, Mayur; Singh, K.K.; Buwa, Vivek V.

doi:10.1016/j.cherd.2018.09.031

Cited by 12 publications

(10 citation statements)

References 23 publications

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“…We validated (Q t = 400 and 800 L/h) the predictions of the dispersion-band thickness and organic-phase volume fraction against experimental measurements. 33 Further, additional experiments 28 and corresponding simulations were performed for a Q t value of 600 L/h at three different endplate positions (hence three different settling areas). The measured and predicted dispersion-band thicknesses (positions of AI and PI) and organic-phase volume fractions were compared (see Figures 4 and 5).…”

Section: Resultsmentioning

confidence: 99%

“…An Eulerian multifluid model developed using the open-source CFD solver OpenFOAM, that has been validated experimentally, 33 was used to perform the numerical simulations. The computational model was further validated by comparing the measurements of dispersion-band thickness and organic-phase volume fraction performed by Thaker et al 28 for different settler lengths. For a given flow rate of the dispersion, an increase in the settler length (for a fixed width) led to an increased settling area and also to an increased residence time.…”

Section: Discussionmentioning

confidence: 99%

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Effects of Geometry and Internals of a Continuous Gravity Settler on Liquid–Liquid Separation

Panda

Buwa

2017

Ind. Eng. Chem. Res.

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Continuous gravity settlers are widely used for liquid–liquid separations in solvent extraction processes. In the present work, the effects of settler design [geometry, settling area (A), locations of inlet and outlet] and internals (baffles, picket fence, end-plate) on the separation performance were investigated. An experimentally validated Eulerian CFD model implemented in OpenFOAM was used. For a fixed flow rate of dispersion (Q t), an increase in the settler length led to a reduction in the dispersion-band thickness. For settlers with length-to-width ratios (L/W) of <1.5, the settler performance was found to be improved by combined use of baffle and picket fence. The organic-to-aqueous phase ratio (αorg/αaq), end-plate height, and aqueous outlet location were found to influence the phase separation significantly. An empirical correlation was developed to predict the dispersion-band thickness as a function of Q t, A, ρorg/ρaq, inlet baffle opening slot position, and αorg/αaq. The present work will be useful for the design of optimal settler configurations.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of Geometry and Internals of a Continuous Gravity Settler on Liquid–Liquid Separation

Panda

Buwa

2017

Ind. Eng. Chem. Res.

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“…При изменении объема сточных вод, которые поступают на очистные станции, и при изменении их состава возникает задача оценки эффективности работы очистных со-оружений в новых условиях эксплуатации. Для этого широко используют математические модели разного уровня -эмпирические, регрессионные, аналитические, численные [3][4][5][7][8][9][10][11][12]. Наиболее часто на практике используют эмпирические модели, которые позволяют быстро определить необходимые показатели работы очистного сооружения, но данные модели не могут быть использованы для расчета сооружений, которые имеют другую геометрию.…”

Section: Introductionunclassified

Simulation of Waste Water Treatment Based on CFD Model: Express Calculation

Kozachyna¹,

Hromova²,

Hunko³

et al. 2021

STP

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Purpose. Development of CFD model to evaluate the efficiency of wastewater treatment in a horizontal settler. The CFD model can be used to calculate flow hydrodynamics and mass transfer in settlers with complex geometric shape in the area of wastewater flow. Methodology. For numerical simulation of the process of wastewater movement in a horizontal settler, two mathematical models are used. The first model is based on the motion equations of a viscous incompressible fluid – the Navier-Stokes equations. The Navier-Stokes equations are written in the variables «vorticity - flow function». A two-dimensional mass transfer equation is used to calculate the concentration of a pollutant in a horizontal settler. To numerically integrate the two-dimensional mass transfer equation, a finite-difference splitting scheme is used. The splitting of the modeling equation of mass transfer is carried out so that at each fractional step to determine the unknown value of the pollutant concentration by an explicit formula. For numerical integration of the vortex transfer equation and the equation for the flow function (the Navier-Stokes system of equations), finite-difference splitting schemes are used. Findings. Based on the developed CFD model, a complex of computer programs has been developed, which makes it possible to determine the efficiency of water treatment in a horizontal settler with additional elements. The results of a computational experiment to assess the efficiency of water treatment in a horizontal settler with additional elements in the form of plates are presented. Originality. An efficient CFD model has been created, which allows to quickly evaluate the efficiency of wastewater treatment in a horizontal settler with additional elements. The developed CFD model takes into account the geometric shape of the facility and the most significant physical factors, that influence the efficiency of the waste water treatment in horizontal settler: non-uniform flow velocity, diffusion, different position of inlet and outlet openings. Practical value. The developed CFD model belongs to the class of «diagnostic models» and can be used to assess the efficiency of treatment facilities at the stage of their preliminary design.

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“…Based on these measurements, different phenomenological models have been developed to predict the rate of phase separation in continuous gravity settlers 2,4 and batch settlers 13‐16 . Also, empirical correlations have been developed to predict the dispersion band thickness in continuous and batch settlers 5,17,18 . In addition, several authors developed empirical correlations to predict the drop‐scale processes (e.g., rate of interfacial and binary coalescence and frequency of interfacial coalescence) as a function of physical properties of the liquids (i.e., density, viscosity, interfacial tension, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…While significant research efforts have been made to understand the liquid–liquid separation in different equipment with supporting phenomenological models as well as empirical correlations, 2,4,5,13‐18 experimentally‐verified CFD models that are capable of simulating liquid–liquid separation are still being developed. Several researchers performed two‐fluid and multi‐fluid CFD simulations of dispersed liquid–liquid flow in various equipment such as stirred vessels, 23‐26 RDCs 27‐29 and pulsed‐sieve plate extraction columns 30 .…”

Section: Introductionmentioning

confidence: 99%

Separation of liquid–liquid dispersion in a batch settler: CFD‐PBM simulations incorporating interfacial coalescence

Thaker

Buwa

2020

AIChE Journal

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Several commercially important chemical processes involve liquid-liquid phase separation. In the present work, we have developed a multi-fluid Eulerian CFD model using OpenFOAM that incorporates binary and interfacial coalescence processes. We simulated separation of kerosene dispersed in water in a batch settler and validated the predictions using the measurements of time-evolution of coalescing and settling interfaces, local dispersed-phase volume fraction (α O) and drop size distribution (DSD). Simulations are performed to understand the contributions of binary and interfacial coalescence processes to the phase separation process. While the timeevolution of coalescing and settling fronts can be predicted reasonably well using the two-fluid model with empirically-corrected drag models, local α O and DSD could not be predicted. We have shown that the comprehensive multi-fluid Eulerian model, which incorporates binary and interfacial coalescence, predicts the time-evolution of the coalescing and settling fronts, local α O and the DSD in an excellent agreement with the measurements.

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Experimental investigations of liquid–liquid disengagement in a continuous gravity settler

Cited by 12 publications

References 23 publications

Effects of Geometry and Internals of a Continuous Gravity Settler on Liquid–Liquid Separation

Effects of Geometry and Internals of a Continuous Gravity Settler on Liquid–Liquid Separation

Simulation of Waste Water Treatment Based on CFD Model: Express Calculation

Separation of liquid–liquid dispersion in a batch settler: CFD‐PBM simulations incorporating interfacial coalescence

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