A Comparative CFD Study on Laminar and Turbulent Flow Fields in
                        Dual-Rushton Turbine Stirred Vessels

Li, L. C.; Chen, N.; Ke-feng, Xiang; Xiang, Baoqiang

doi:10.29252/jafm.13.02.30061

Cited by 5 publications

(6 citation statements)

References 31 publications

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“…Process tomography includes sending a signal through the system and constructing an image based on the signal received across detectors which are arranged a cross-sectional plane of the object. Depending on the type of sensors used, the tomography can be divided into positron emission tomography (PET) [67] nuclear magnetic resonance (NMR), [160], ultrasound tomography (acoustic) [161] and electrical tomography [87,162]. Based on the electrical properties measurement, such as resistance, capacitance, eddy current, permeability, etc., the electrical tomography is further classified into electrical capacitance tomography (ECT) and electrical impedance tomography (EIT), which include the electrical resistance tomography (ERT) as an special case.…”

Section: Tomography In Mixing Processmentioning

confidence: 99%

A General Review of the Current Development of Mechanically Agitated Vessels

Jaszczur

Młynarczykowska

2020

Processes

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The mixing process in a mechanically agitated vessel is a widespread phenomenon which plays an important role among industrial processes. In that process, one of the crucial parameters, the mixing efficiency, depends on a large number of geometrical factors, as well as process parameters and complex interactions between the phases which are still not well understood. In the last decade, large progress has been made in optimisation, construction and numerical and experimental analysis of mechanically agitated vessels. In this review, the current state in this field has been presented. It shows that advanced computational fluid dynamic techniques for multiphase flow analysis with reactions and modern experimental techniques can be used with success to analyse in detail mixing features in liquid-liquid, gas-liquid, solid-liquid and in more than two-phase flows. The objective is to show the most important research recently carried out.

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Section: Tomography In Mixing Processmentioning

confidence: 99%

A General Review of the Current Development of Mechanically Agitated Vessels

Jaszczur

Młynarczykowska

2020

Processes

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“…Mechanically-agitated reactor vessels are widely used for the mixing and mass transfer processes associated with the chemical, pharmaceutical, petroleum, mineral and metallurgical industries (Li et al 2020). The Rushton Turbine (RT) impeller is widely employed for agitation purposes in those industries (Debab et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Computational Fluid Dynamics (CFD) has been widely employed for modeling flow and transport processes in mechanically-agitated reactors (Li et al 2020). The local velocity and turbulence characteristics obtained from the CFD models can be effectively used for selecting the optimal configuration of the reactor vessels (Zamiri and Chunk 2018).…”

Section: Introductionmentioning

confidence: 99%

Physical Reasoning of Double- to Single-Loop Transition in Industrial Reactors using Computational Fluid Dynamics

Iyer

Patel²

2022

JAFM

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Double- to single-loop pattern transition and a significant reduction in the power number with a decrease in the clearance of the Rushton turbine impeller in a baffled reactor was elucidated in earlier research works. The present work investigates the physical reasons behind these phenomena using the computational fluid dynamics approach. The Reynolds Averaged Navier–Stokes equations with standard turbulence model closure were used to model the turbulent flow conditions in the reactor vessels. The Multiple Reference Frame (MRF) approach was adopted to model the impeller baffle interactions in the reactor vessels. The implicit Volume of Fluid (VOF) method was employed to simulate the aeration process in the reactor configurations considered. The development of a low pressure region below the impeller of a low clearance vessel deflects the discharge streams downward, leading to the formation of a single-loop pattern. The downward movement of the discharge streams reduces the vortex activity behind the impeller blades, leading to weaker form drag and a decrease in the power number of the impeller. Similarly, a high clearance vessel provides a low pressure region above the impeller which deflects the discharge streams above the impeller, resulting in a single-loop pattern and a considerable increase in the air entrainment due to superior vortex and turbulence activity present near the free liquid surface. The standard reactor vessel was found to provide superior bulk mixing of fluid as the overall turbulent dissipation rate is 35% more than that associated with low and high clearance vessels.

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“…It is of great significance to study the mixing process in the stirred reactor for better control of the reaction process and optimization of the reactor structure. Mixing equipment is widely used in the chemical industry, , medicine, food, mining, papermaking, wastewater treatment, and other fields. − It can be used not only for chemical reactions but also for material mixing, heat transfer, mass transfer, and suspension preparation . The mixing equipment is mainly composed of a shell, mixing device, and heat exchange equipment.…”

Section: Introductionmentioning

confidence: 99%

“…3−6 It can be used not only for chemical reactions but also for material mixing, heat transfer, mass transfer, and suspension preparation. 7 The mixing equipment is mainly composed of a shell, mixing device, and heat exchange equipment. To improve the flow state, baffles, a draft tube, and other accessories can also be equipped.…”

Section: Introductionmentioning

confidence: 99%

Study on the Flow Field Characteristics of a Liquid–Solid–Solid Three-Phase System and the Influence of a Draft Tube in a Stirred Reactor

Wang

et al. 2020

Ind. Eng. Chem. Res.

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The liquid−solid−solid three-phase flow field was established in a stirred reactor with a draft tube and baffles. The solid concentration distribution, mixing time, velocity distribution, flow pattern, and power consumption of the flow field were systematically studied by means of a cold model experiment and computational fluid dynamics (CFD) simulation. The CFD model was based on the Euler multiphase flow model and the RNG k−ε turbulence model. Different momentum exchange coefficient models were taken into account for each phase. It was found that at the same stirring speed, the solid distribution was more uniform and the mixing time was less when the draft tube was equipped. The flow pattern of the flow field was more regular and the velocity distribution of the solid phase was more uniform in the reactor with the draft tube. According to the Nagata correlation, a power consumption formula was derived, and its applicability was verified by comparison of the experimental results.

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A Comparative CFD Study on Laminar and Turbulent Flow Fields in Dual-Rushton Turbine Stirred Vessels

Cited by 5 publications

References 31 publications

A General Review of the Current Development of Mechanically Agitated Vessels

A General Review of the Current Development of Mechanically Agitated Vessels

Physical Reasoning of Double- to Single-Loop Transition in Industrial Reactors using Computational Fluid Dynamics

Study on the Flow Field Characteristics of a Liquid–Solid–Solid Three-Phase System and the Influence of a Draft Tube in a Stirred Reactor

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