Multi-particle suspension in a laminar flow agitated by a Rushton turbine

Chao Wang, Li Zhang, Zhipeng Li, Zhengming Gao, J J Derksen

Research output: Contribution to journalArticle

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4 Downloads (Pure)

Abstract

Multi-particle suspension in a laminar stirred tank flow agitated by a standard Rushton turbine was investigated experimentally and numerically. In the experiments, the motion of the particles was measured by two high-speed cameras and was quantitatively analyzed. Two very stable particle patterns were observed. Strong flow is required to break these patterns because their formation hinders the particle lift-off process. The experimental trajectories and vertical velocities of the particles were measured, and highly reproducible results were found. Direct numerical simulations based on the lattice-Boltzmann method and the resolved particle model were performed to fully resolve the motion of the particles and the flow field. The influence of the friction coefficient and the subgrid lubrication force model on particle suspension was evaluated. Except for the random characteristics of particles interaction at the initial lift-off stage, the predicted trajectories and velocities of the particles are in good agreement with the experimental results. The pressure gradient around the particles is a key mechanism for the lift-off process.
Original languageEnglish
Pages (from-to)831-842
Number of pages12
JournalChemical Engineering Research & Design
Volume132
Early online date6 Mar 2018
DOIs
Publication statusPublished - Apr 2018

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Laminar flow
Suspensions
Turbines
Trajectories
Particle interactions
High speed cameras
Direct numerical simulation
Pressure gradient
Lubrication
Flow fields
Friction
Experiments

Keywords

  • solid-liquid suspension
  • multiple particles
  • laminar flow
  • lattice-Boltzmann method
  • direct numerical simulation

Cite this

Multi-particle suspension in a laminar flow agitated by a Rushton turbine. / Wang, Chao; Zhang, Li ; Li, Zhipeng; Gao, Zhengming; Derksen, J J.

In: Chemical Engineering Research & Design, Vol. 132, 04.2018, p. 831-842.

Research output: Contribution to journalArticle

Wang, Chao ; Zhang, Li ; Li, Zhipeng ; Gao, Zhengming ; Derksen, J J. / Multi-particle suspension in a laminar flow agitated by a Rushton turbine. In: Chemical Engineering Research & Design. 2018 ; Vol. 132. pp. 831-842.
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abstract = "Multi-particle suspension in a laminar stirred tank flow agitated by a standard Rushton turbine was investigated experimentally and numerically. In the experiments, the motion of the particles was measured by two high-speed cameras and was quantitatively analyzed. Two very stable particle patterns were observed. Strong flow is required to break these patterns because their formation hinders the particle lift-off process. The experimental trajectories and vertical velocities of the particles were measured, and highly reproducible results were found. Direct numerical simulations based on the lattice-Boltzmann method and the resolved particle model were performed to fully resolve the motion of the particles and the flow field. The influence of the friction coefficient and the subgrid lubrication force model on particle suspension was evaluated. Except for the random characteristics of particles interaction at the initial lift-off stage, the predicted trajectories and velocities of the particles are in good agreement with the experimental results. The pressure gradient around the particles is a key mechanism for the lift-off process.",
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AU - Wang, Chao

AU - Zhang, Li

AU - Li, Zhipeng

AU - Gao, Zhengming

AU - Derksen, J J

N1 - The financial supports from the National Key R&D Program of China (2017YFB0306704) and the National Natural Science Foundation of China (No.21676007) are gratefully acknowledged.

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N2 - Multi-particle suspension in a laminar stirred tank flow agitated by a standard Rushton turbine was investigated experimentally and numerically. In the experiments, the motion of the particles was measured by two high-speed cameras and was quantitatively analyzed. Two very stable particle patterns were observed. Strong flow is required to break these patterns because their formation hinders the particle lift-off process. The experimental trajectories and vertical velocities of the particles were measured, and highly reproducible results were found. Direct numerical simulations based on the lattice-Boltzmann method and the resolved particle model were performed to fully resolve the motion of the particles and the flow field. The influence of the friction coefficient and the subgrid lubrication force model on particle suspension was evaluated. Except for the random characteristics of particles interaction at the initial lift-off stage, the predicted trajectories and velocities of the particles are in good agreement with the experimental results. The pressure gradient around the particles is a key mechanism for the lift-off process.

AB - Multi-particle suspension in a laminar stirred tank flow agitated by a standard Rushton turbine was investigated experimentally and numerically. In the experiments, the motion of the particles was measured by two high-speed cameras and was quantitatively analyzed. Two very stable particle patterns were observed. Strong flow is required to break these patterns because their formation hinders the particle lift-off process. The experimental trajectories and vertical velocities of the particles were measured, and highly reproducible results were found. Direct numerical simulations based on the lattice-Boltzmann method and the resolved particle model were performed to fully resolve the motion of the particles and the flow field. The influence of the friction coefficient and the subgrid lubrication force model on particle suspension was evaluated. Except for the random characteristics of particles interaction at the initial lift-off stage, the predicted trajectories and velocities of the particles are in good agreement with the experimental results. The pressure gradient around the particles is a key mechanism for the lift-off process.

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