Particle-resolved simulations of liquid fluidization of rigid and flexible fibers

J.J. Derksen

doi:10.1007/s00707-020-02832-2

Particle-resolved simulations of liquid fluidization of rigid and flexible fibers

J.J. Derksen^* (Corresponding Author)

^*Corresponding author for this work

Engineering

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5 Citations (Scopus)

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Abstract

Particle-resolved, three-dimensional, time-dependent simulations of rigid and flexible cylinders fluidized by a liquid flow in fully periodic domains have been performed by means of the lattice-Boltzmann method supplemented with immersed boundaries. The solids volume fraction ranges from 0.10 to 0.48 and the length-over-diameter aspect ratio of the cylinders from 4 to 12. The bending stiffness of the cylinders is the third major input parameter. The resulting Reynolds numbers based on the average slip velocity of the cylinders and their equivalent diameter range from 6 to 70. It is shown that increasing the flexibility—that is, decreasing the bending stiffness—reduces the Reynolds number, an effect that is most pronounced for low solids volume fractions and long cylinders. As for rigid cylinders, the distribution of the orientation relative to the direction of gravity of the flexible cylinders is a pronounced function of the solids volume fraction and the aspect ratio. Flexibility tends to somewhat randomize the orientation distribution, which could explain the effect of flexibility on the slip velocity and thus the Reynolds number.

Original language	English
Pages (from-to)	5193–5203
Number of pages	11
Journal	Acta Mechanica
Volume	231
Early online date	20 Oct 2020
DOIs	https://doi.org/10.1007/s00707-020-02832-2
Publication status	Published - 1 Dec 2020

Keywords

Fluidization
particle-resolved simulation
non-spherical particles
flexible fibers
lattice-Boltzmann method

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Cite this

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AU - Derksen, J.J.

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N2 - Particle-resolved, three-dimensional, time-dependent simulations of rigid and flexible cylinders fluidized by a liquid flow in fully periodic domains have been performed by means of the lattice-Boltzmann method supplemented with immersed boundaries. The solids volume fraction ranges from 0.10 to 0.48 and the length-over-diameter aspect ratio of the cylinders from 4 to 12. The bending stiffness of the cylinders is the third major input parameter. The resulting Reynolds numbers based on the average slip velocity of the cylinders and their equivalent diameter range from 6 to 70. It is shown that increasing the flexibility—that is, decreasing the bending stiffness—reduces the Reynolds number, an effect that is most pronounced for low solids volume fractions and long cylinders. As for rigid cylinders, the distribution of the orientation relative to the direction of gravity of the flexible cylinders is a pronounced function of the solids volume fraction and the aspect ratio. Flexibility tends to somewhat randomize the orientation distribution, which could explain the effect of flexibility on the slip velocity and thus the Reynolds number.

AB - Particle-resolved, three-dimensional, time-dependent simulations of rigid and flexible cylinders fluidized by a liquid flow in fully periodic domains have been performed by means of the lattice-Boltzmann method supplemented with immersed boundaries. The solids volume fraction ranges from 0.10 to 0.48 and the length-over-diameter aspect ratio of the cylinders from 4 to 12. The bending stiffness of the cylinders is the third major input parameter. The resulting Reynolds numbers based on the average slip velocity of the cylinders and their equivalent diameter range from 6 to 70. It is shown that increasing the flexibility—that is, decreasing the bending stiffness—reduces the Reynolds number, an effect that is most pronounced for low solids volume fractions and long cylinders. As for rigid cylinders, the distribution of the orientation relative to the direction of gravity of the flexible cylinders is a pronounced function of the solids volume fraction and the aspect ratio. Flexibility tends to somewhat randomize the orientation distribution, which could explain the effect of flexibility on the slip velocity and thus the Reynolds number.

KW - Fluidization

KW - particle-resolved simulation

KW - non-spherical particles

KW - flexible fibers

KW - lattice-Boltzmann method

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DO - 10.1007/s00707-020-02832-2

M3 - Article

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VL - 231

SP - 5193

EP - 5203

JO - Acta Mechanica

JF - Acta Mechanica

ER -

Particle-resolved simulations of liquid fluidization of rigid and flexible fibers

Abstract

Keywords

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