Mechanisms for drawdown of floating particles in a laminar stirred tank flow

He Gong; Fenglei Huang; Zhipeng Li; Zhengming Gao; J. J. Derksen

doi:10.1016/j.cej.2018.04.011

Mechanisms for drawdown of floating particles in a laminar stirred tank flow

He Gong, Fenglei Huang, Zhipeng Li, Zhengming Gao, J. J. Derksen

Engineering

Beijing University of Chemical Technology

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

12 Downloads (Pure)

Abstract

Particle image velocimetry (PIV) experiments on a laminar stirred tank flow with floating particles at just drawdown conditions were performed. Careful refractive index matching of the two phases allowed to resolve the flow around the particles. The maximum solids volume fraction was 4%. The impeller was a pitched blade turbine with upward and downward pumping modes and with different off-bottom clearances, and the impeller-based Reynolds number
ranged from about 50 to 120. Computational fluid dynamics (CFD) coupled to a discrete phase model (DPM) and discrete element method (DEM) was used to predict the flow field, with an emphasis on the tangential velocity component. The liquid velocity profiles predicted by the CFD simulations are in good agreement with the PIV experimental data. The drawdown process and local particle accumulation simulated by the DPM-DEM model agrees with the experimental phenomena as well. Tangential velocity and particles collisions around the shaft trigger the onset of the drawdown of the floating particles.

Original language	English
Pages (from-to)	340-350
Number of pages	11
Journal	Chemical Engineering Journal
Volume	346
Early online date	5 Apr 2018
DOIs	https://doi.org/10.1016/j.cej.2018.04.011
Publication status	Published - 15 Aug 2018

Bibliographical note

The authors gratefully acknowledge the financial support from the National Key R&D Program of China (2017YFB0306701) and from the National Natural Science Foundation of China (No.21676007).

Keywords

drawdown
floating particles
particle image velocimetry
refractive index matching
stirred tank

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© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 5.93 MBLicence: CC BY-NC-ND

Cite this

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title = "Mechanisms for drawdown of floating particles in a laminar stirred tank flow",

abstract = "Particle image velocimetry (PIV) experiments on a laminar stirred tank flow with floating particles at just drawdown conditions were performed. Careful refractive index matching of the two phases allowed to resolve the flow around the particles. The maximum solids volume fraction was 4%. The impeller was a pitched blade turbine with upward and downward pumping modes and with different off-bottom clearances, and the impeller-based Reynolds numberranged from about 50 to 120. Computational fluid dynamics (CFD) coupled to a discrete phase model (DPM) and discrete element method (DEM) was used to predict the flow field, with an emphasis on the tangential velocity component. The liquid velocity profiles predicted by the CFD simulations are in good agreement with the PIV experimental data. The drawdown process and local particle accumulation simulated by the DPM-DEM model agrees with the experimental phenomena as well. Tangential velocity and particles collisions around the shaft trigger the onset of the drawdown of the floating particles. ",

keywords = "drawdown, floating particles, particle image velocimetry, refractive index matching, stirred tank",

author = "He Gong and Fenglei Huang and Zhipeng Li and Zhengming Gao and Derksen, {J. J.}",

note = "The authors gratefully acknowledge the financial support from the National Key R&D Program of China (2017YFB0306701) and from the National Natural Science Foundation of China (No.21676007).",

year = "2018",

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doi = "10.1016/j.cej.2018.04.011",

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T1 - Mechanisms for drawdown of floating particles in a laminar stirred tank flow

AU - Gong, He

AU - Huang, Fenglei

AU - Li, Zhipeng

AU - Gao, Zhengming

AU - Derksen, J. J.

N1 - The authors gratefully acknowledge the financial support from the National Key R&D Program of China (2017YFB0306701) and from the National Natural Science Foundation of China (No.21676007).

PY - 2018/8/15

Y1 - 2018/8/15

N2 - Particle image velocimetry (PIV) experiments on a laminar stirred tank flow with floating particles at just drawdown conditions were performed. Careful refractive index matching of the two phases allowed to resolve the flow around the particles. The maximum solids volume fraction was 4%. The impeller was a pitched blade turbine with upward and downward pumping modes and with different off-bottom clearances, and the impeller-based Reynolds numberranged from about 50 to 120. Computational fluid dynamics (CFD) coupled to a discrete phase model (DPM) and discrete element method (DEM) was used to predict the flow field, with an emphasis on the tangential velocity component. The liquid velocity profiles predicted by the CFD simulations are in good agreement with the PIV experimental data. The drawdown process and local particle accumulation simulated by the DPM-DEM model agrees with the experimental phenomena as well. Tangential velocity and particles collisions around the shaft trigger the onset of the drawdown of the floating particles.

AB - Particle image velocimetry (PIV) experiments on a laminar stirred tank flow with floating particles at just drawdown conditions were performed. Careful refractive index matching of the two phases allowed to resolve the flow around the particles. The maximum solids volume fraction was 4%. The impeller was a pitched blade turbine with upward and downward pumping modes and with different off-bottom clearances, and the impeller-based Reynolds numberranged from about 50 to 120. Computational fluid dynamics (CFD) coupled to a discrete phase model (DPM) and discrete element method (DEM) was used to predict the flow field, with an emphasis on the tangential velocity component. The liquid velocity profiles predicted by the CFD simulations are in good agreement with the PIV experimental data. The drawdown process and local particle accumulation simulated by the DPM-DEM model agrees with the experimental phenomena as well. Tangential velocity and particles collisions around the shaft trigger the onset of the drawdown of the floating particles.

KW - drawdown

KW - floating particles

KW - particle image velocimetry

KW - refractive index matching

KW - stirred tank

U2 - 10.1016/j.cej.2018.04.011

DO - 10.1016/j.cej.2018.04.011

M3 - Article

SN - 1385-8947

VL - 346

SP - 340

EP - 350

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

ER -

Mechanisms for drawdown of floating particles in a laminar stirred tank flow

Abstract

Bibliographical note

Keywords

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