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Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization

Published online by Cambridge University Press:  08 January 2021

Yiyang Jiang ,
Yu Guo Open the ORCID record for Yu Guo [Opens in a new window] ,
Zhaosheng Yu Open the ORCID record for Zhaosheng Yu [Opens in a new window] ,
Xia Hua ,
Jianzhong Lin ,
Carl R. Wassgren  and
Jennifer S. Curtis
Yiyang Jiang
Affiliation:
Department of Engineering Mechanics, Zhejiang University, Hangzhou310027, PR China
Yu Guo*
Affiliation:
Department of Engineering Mechanics, Zhejiang University, Hangzhou310027, PR China
Zhaosheng Yu
Affiliation:
Department of Engineering Mechanics, Zhejiang University, Hangzhou310027, PR China
Xia Hua
Affiliation:
Weisberg Department of Mechanical Engineering, Marshall University, Huntington, WV25755, USA
Jianzhong Lin*
Affiliation:
Department of Engineering Mechanics, Zhejiang University, Hangzhou310027, PR China
Carl R. Wassgren
Affiliation:
School of Mechanical Engineering, Purdue University, West Lafayette, IN47907, USA
Jennifer S. Curtis
Affiliation:
Department of Chemical Engineering, University of California Davis, Davis, CA95616, USA
*
† Email addresses for correspondence: [email protected], [email protected]
† Email addresses for correspondence: [email protected], [email protected]
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Abstract

Gas-fluidized beds of flexible fibres, which have been rarely studied before, are investigated in this work using the coupled approach of the discrete element method and computational fluid dynamics. In the present numerical method, gas–fibre interaction is modelled by calculating the interaction force for each constituent element in the fibre, and the composition of the interaction forces on the constituent elements generates a resultant hydrodynamic force and a resultant hydrodynamic torque on the fibre. Pressure drops and fibre orientation results from the present simulations with various fibre aspect ratios are in good agreement with previous experimental and simulation results. Some novel results are obtained for the effects of fibre flexibility. Larger hydrodynamic forces on fibres (before the bed is fluidized) and smaller minimum fluidization velocities (MFVs) are observed for more flexible fibre beds due to the smaller porosities, while smaller hydrodynamic forces are obtained for the more flexible fibres when the beds are fluidized with significant fibre motion. By scaling the superficial gas velocity using the MFVs, the data of pressure drop can collapse onto the Ergun correlation for stiff fibres of various aspect ratios; however, the pressure drop curves deviate from the Ergun correlation for very flexible fibres, due to the significant fibre bed expansion before the MFV is reached. The fibre aspect ratio and flexibility both have an impact on the solids mixing rate, and it is found that the solids mixing rates are essentially determined by the ratio of the superficial gas velocity to MFV.

JFM classification

Multiphase and Particle-laden Flows: Fluidized beds Multiphase and Particle-laden Flows: Multiphase flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 910 , 10 March 2021 , A8
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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