PIV measurement and CFD simulation of liquid-liquid flow of a settler in rare earths solvent extraction mixer-settler

Ye, Sishi; Tang, Qiao; Wang, Yundong; Fei, Weiyang

doi:10.1016/j.ijheatfluidflow.2016.07.014

Cited by 15 publications

(4 citation statements)

References 7 publications

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“…The PIV technology is the latest flow test method, which has been developed by fully utilizing the research achievements of optical technology, image analysis technology, and modern computer technology. PIV is applied to stirred tank, bubble column, hydrocyclone, and flotation column for its unique noncontact and instantaneous measurement advantages. PIV can measure single‐phase flow and two‐phase flow, but it is more mature at present for single‐phase flow test.…”

Section: Methodsmentioning

confidence: 99%

Effect of height of flotation column on flow field

Yan

Wang

et al. 2019

Asia-Pacific J Chem Eng

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Cyclonic‐static microbubble flotation column (FCSMC) is a sorting equipment for micro fine‐grained minerals. The column height is an important factor affecting the flotation efficiency, which will directly affect the flow field and separation performance. In this study, particle image velocimetry measurement on single phase of lab‐scale FCSMC with diameter D of 0.1 m was tested to verify the accuracy of the turbulent model used in computational fluid dynamics simulation. Then the FCSMC with different upper column and lower column height were simulated and analyzed. Results show that the axial velocity and tangential velocity play a major role in FCSMC. With the increasing of the upper column height, both tangential velocity and centrifugal intensity decrease, which help to get a static environment for column flotation unit. But too high upper column height will affect the separation of the cyclone flotation unit due to small centrifugal intensity. When the lower column height‐to‐diameter ratio H2/D increases from 1 to 4, it has no obvious effect on column flotation unit, but does effect on the flow field of the cyclone flotation unit. As the lower column height increases, the upward overflow is more prominent and the region becomes larger. Peculiarly, tangential velocity is large under too small lower column height, like H2/D = 1, but is bad for the separation of large size tailings due to low distance and great suction. Within the scope of this study, the lower column height range is more suitable for H2/D = 2–3.

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Section: Methodsmentioning

confidence: 99%

Effect of height of flotation column on flow field

Yan

Wang

et al. 2019

Asia-Pacific J Chem Eng

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“…Mixer-settler is a commonly utilized lanthanides separation device which consists of a mixing chamber bringing convective mixing of immiscible phases and a settling chamber performing phase separation [3]. However, due to the chemical resemblance of lanthanides, it is difficult to achieve their separation thus cascade separation operation with thousands of mixer-settler has to be implemented [1].…”

Section: Nomenclaturementioning

confidence: 99%

“…Grid independence check has been carried out to assure the accuracy of solutions. The total number of meshes is 956017 and the average mesh size is 5.48×10 -7 mm 3 In order to obtain higher processing flux of lanthanide ions, a model with microchannel dimension of 1 mm in diameter was adopted in the following modeling analyses, and the organic to aqueous ratio was kept at 1:1. processes for both La 3+ and Eu 3+ were accelerated by increasing flow velocity. Fig.…”

Section: Numerical Solutionmentioning

confidence: 99%

Toward a mechanistic understanding of microfluidic droplet-based extraction and separation of lanthanides

Zhang

Wang

Luo

et al. 2019

Chemical Engineering Journal

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Droplet-based microfluidic extraction is a promising way for effective lanthanides extraction due to its outstanding mass transfer performance. The separation process can be greatly enhanced with the droplet-based microfluidic extraction technique. However, the interactions between mass transfer, microfluidic dynamics and extraction kinetics are still unclear, which has hindered further manipulation on microfluidic extraction to boost extraction performance. In this study, the mechanisms of microfluidic droplet-based extraction and separation intensification of lanthanides are for the first time unveiled by using a numerical simulation model. The limiting factors for the performance of droplet-based microfluidic extraction are identified through a model-based parametric analysis. The numerical analyses provide a comprehensive understanding of droplet-based microfluidic extraction systems and offer operation and optimization guidelines for future research in this area.

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“…Therefore, mixing time can be directly calculated from the velocity of the mixed fluid [12]. The velocity can be measured by various indirect techniques such as the Laser Doppler Anemometry (LDA) [13,14], Particle Image Velocimetry (PIV) [15,16], or the less common Positron Emission Particle Tracking (PEPT) [17,18]. Furthermore, it can also be calculated with a proper CFD simulator.…”

Section: Introductionmentioning

confidence: 99%

CFD Based Qualification of Mixing Efficiency of Stirred Vessels

Till

Molnár²,

Egedy

et al. 2018

Period. Polytech. Chem. Eng.

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In this work, we focus on the most crucial units in a chemical technology, the chemical reactors. Using a commercially available CFD software package, COMSOL Multiphysics, 3D mathematical models of a batch reactor with different impeller geometries have been investigated. The reasonable agreement between the experimental and simulation results indicates the validity of the developed CFD model. The effect of the impeller design, e. g. number of blades on the mixing efficiency is evaluated based on the simulation studies.The proposed measure to determine the energy efficiency of mixing (i. e. mixing index) is based on the calculated velocity field and energy usage. The information about the homogeneity of the mixed phase in the system can be extracted from the developed velocity field. Hence, we proposed histograms of velocity fluctuations on a logarithmic scale as an efficient tool to measure the achieved homogeneity of the phase in case of different impellers and rotational speeds. IntroductionDuring the last few decades, computational fluid dynamics (CFD) method has become a very powerful tool in the process industry primarily to analyse the hydrodynamic behavior. In general, CFD methods rely on the numerical solution of the Navier-Stokes equations, thus flow velocity, velocity magnitudes, and pressure values can be calculated in the geometric space investigated. A particularly significant benefit of the CFD simulators is that they can include entire apparatuses in three dimensions, regarding either single phase or multiphase systems [1,2]. This property of the CFD simulators makes them useful in a large number of research areas, including the study of mixing phenomena. Fluid mixing is a fundamental operation in the chemical process industry and the stirred tank or autoclave is a commonly used reactor type in many kinds of chemical technologies; therefore these systems are well described. Regardless, when it comes to design work, simple experimental correlations are still commonly used, e.g. Reynolds number, Froude number, power number or the Euler number which is derived from the previous ones. This approach has its limitations when it comes to the design of stirred vessels with complex internal structure.

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PIV measurement and CFD simulation of liquid-liquid flow of a settler in rare earths solvent extraction mixer-settler

Cited by 15 publications

References 7 publications

Effect of height of flotation column on flow field

Effect of height of flotation column on flow field

Toward a mechanistic understanding of microfluidic droplet-based extraction and separation of lanthanides

CFD Based Qualification of Mixing Efficiency of Stirred Vessels

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