Head–flow characteristics of pump-mix mixers

Srilatha, C.; Savant, Amit R.; Patwardhan, Ashwin W.; Ghosh, Sumana

doi:10.1016/j.cep.2007.09.009

Cited by 16 publications

(4 citation statements)

References 11 publications

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“…This is reasonable and is caused by the low off-bottom clearance 𝐶 = 10 mm, leading to a singleloop pattern [28,29,36,37] in a comparable batch vessel. This was also observed in pumpmixers by other authors using a low off-bottom clearance [7,10].…”

Section: Dsd At Different Measurement Positionssupporting

confidence: 77%

“…Srilatha et al started with the head characteristics of different impellers and impeller heights in 2008 [7] and published two-phase experiments and CFD modeling. Their measurement setup was similar to the one reported by Singh et al [6] and their focus was on detailed phenomena between the flow pattern in the tank and its respective DSD [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Fluid Dynamics in a Continuous Pump-Mixer

et al. 2022

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The fluid dynamic (flow rates) and hydrodynamic behavior (local droplet size distributions and local holdup) of a continuous DN300 pump-mixer were investigated using water as the continuous phase and paraffin oil as the dispersed phase. The influence of the impeller speed (N = 375 to 425 rpm), the feed phase ratio (φF = 10 to 30 vol.-%), and the flow rate (V˙tot ≈ 0.5 to 2.3 L/min) were investigated by measuring the pumping height, local holdup of the disperse phase, and the droplet size distribution (DSD). The latter one was measured at three different vessel positions using an image-based telecentric shadowgraphic technique. The droplet diameters were extracted from the acquired images using a neural network. The Sauter mean diameters were calculated from the DSD and correlated with an extended model based on Doulah (1975), considering the impeller speed, the feed phase ratio, and additionally the flow rate. The new correlation can describe an extensive database containing 155 experiments of the fluid and hydrodynamic within a 15% error range.

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Section: Dsd At Different Measurement Positionssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Fluid Dynamics in a Continuous Pump-Mixer

et al. 2022

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“…The pump-mixer can realize the dual effects of pumping and mixing due to the pumping action of the impeller and is wildly applied in nuclear fuel reprocessing and chemical industries. The critical component of the pump-mixer is the impeller, and different types can be found in the literature. − In this study, an impeller, similar to the pump-mix type in the Davy–McKee combined mixer settler (CMS) is used. Figure shows the photo and schematic diagram of the pump-mixer, which comprises a square tank equipped with an eight-curved-blade impeller.…”

Section: Methodsmentioning

confidence: 99%

Influence of Dispersed-Phase Viscosity on Droplet Breakup in a Continuous Pump-Mixer

Zhou

Yang

Jing

et al. 2019

Ind. Eng. Chem. Res.

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The influence of dispersed-phase viscosity on droplet breakup in a pump-mixer was determined using a direct measurement approach, which was performed using a high-speed online camera. The experimental results show that the interfacial stress and internal viscous stress can be applied to characterize the influence of the interfacial tension and dispersed-phase viscosity on drop breakup, respectively. The daughter droplet size presents a bell-shaped distribution and is slightly dependent on the drop restoring stress. An empirical correlation of the drop breakup frequency function is established to include the influence of the dispersed-phase viscosity. Moreover, the new correlation reveals a clear physical relationship between the variables of physical properties and hydraulic parameters, which strengthens its extensibility when applied to other systems or equipment.

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“…Over the years, various types of equipment were adopted in the industry, for example, centrifugal extractors, extraction columns, , and mixer-settlers . Among them, mixer-settlers are one of the most widely used ones because of their inherent advantages such as high efficiency of the stage, strong adaptability, simple operation, and large processing capacity. − Generally, mixer-settlers adopted in industry have a multi-stage structure. A cascade of mixer-settlers requires inter-stage fluid transportation of two phases.…”

Section: Introductionmentioning

confidence: 99%

CFD–PBM Simulation of Liquid–Liquid Dispersions in a Pump-Mixer

Zhou

Wang

et al. 2021

Ind. Eng. Chem. Res.

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The approach coupling computational fluid dynamics and a population balance model (PBM) was adopted to simulate the hydraulic performance of liquid–liquid dispersions in a pump-mixer. Behaviors of the drop breakage and coalescence were considered in the PBM. To validate simulation methods and strategies, simulated drop size distributions were compared with experimental data and a good agreement was obtained. Flow structures in the pump-mixer were analyzed and two recirculation loops were observed. Holdup profiles reveal that the dispersed phase is unevenly distributed in space, which is more obvious at lower rotating speeds. Simulation results show that breakup regions are mainly located near the impeller where high energy dissipation rates exist, while coalescence regions were observed in the whole mixer. Distributions of the drop mean diameter were displayed. It indicated that the drop size is uniformly distributed in space at higher rotating speeds.

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Head–flow characteristics of pump-mix mixers

Cited by 16 publications

References 11 publications

Fluid Dynamics in a Continuous Pump-Mixer

Fluid Dynamics in a Continuous Pump-Mixer

Influence of Dispersed-Phase Viscosity on Droplet Breakup in a Continuous Pump-Mixer

CFD–PBM Simulation of Liquid–Liquid Dispersions in a Pump-Mixer

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