Non-spherical particles in a pseudo-2D fluidised bed: Modelling study

Mahajan, Vinay V.; Nijssen, Tim M.J.; Kuipers, J.A.M.; Padding, JT Johan

doi:10.1016/j.ces.2018.08.041

Cited by 60 publications

(31 citation statements)

References 54 publications

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“…Channel flows can occur before bubbling flows for elongated rods and flat disks (Kruggel-Emden & Vollmari 2016; Mahajan et al. 2018 b ), caused by the stronger interlocking of non-spherical particles compared to spheres. The particle shape affects porosity and fluid drag force, consequently impacting pressure drop, minimum fluidization velocity and bed height (Zhong et al.…”

Section: Introductionmentioning

confidence: 99%

“…2015; Gan, Zhou & Yu 2016; Vollmari, Jasevičius & Kruggel-Emden 2016; Ma, Xu & Zhao 2017; Mahajan et al. 2018 a ). For example, consider three-dimensional (3-D) ellipsoidal particles in which two of the particle axes are equal ( a = b ); the aspect ratio ( AR ) of the ellipsoidal particle is defined as AR = c/a , where c is the length of the third axis.…”

Section: Introductionmentioning

confidence: 99%

“…2017; Mahajan et al. 2018 a ; Shrestha et al. 2019, 2020), because reliable models of lift force and torque are not available and the effect of surrounding particles on the lift force and torque cannot be accurately considered for non-spherical particles in the DEM-CFD scheme.…”

Section: Introductionmentioning

confidence: 99%

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

Jiang

Guo

et al. 2021

J. Fluid Mech.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Jiang

Guo

et al. 2021

J. Fluid Mech.

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“…Fluidization of elongated particles such as cylinders, ellipsoids, and spherocylinders has been the topic of several numerical investigations. [1][2][3][4][5] More fundamental research has also been conducted to obtain a better understanding of the hydrodynamic forces acting on individual elongated particles. [6][7][8][9] Experimental investigations for validation of computational models for dense gas-particle flows are still quite scarce, especially for three dimenensional (3D) systems.…”

Section: Introductionmentioning

confidence: 99%

“…The first experimental research on fluidization of nonspherical particles was carried out using this technique. 1,11,12 For 3D systems, X-ray tomography (XRT) has been widely used for fluidized beds with spherical particles. [13][14][15][16] For most particle sizes, this technique can only provide insight in the bubble behavior of fluidized beds and unfortunately no information on the particle orientation, which is an important parameter for nonspherical particles.…”

Section: Introductionmentioning

confidence: 99%

Fluidization of spherical versus elongated particles: Experimental investigation using magnetic particle tracking

et al. 2019

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In biomass processing fluidized beds are used to process granular materials where particles typically possess elongated shapes. However, for simplicity, in computer simulations particles are often considered spherical, even though elongated particles experience more complex particle-particle interactions as well as different hydrodynamic forces. The exact effect of these more complex interactions in dense fluidized suspensions is still not well understood. In this study we use the magnetic particle tracking technique to compare the fluidization behavior of spherical particles to that of elongated particles. We found a considerable difference between fluidization behavior of spherical versus elongated particles in the time-averaged particle velocity field as well as in the time-averaged particle rotational velocity profile. Moreover, we studied the effect of fluid velocity and the particle's aspect ratio on the particle's preferred orientation in different parts of the bed, which provides new insight in the fluidization behavior of elongated particles.

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Liquid fluidization with cylindrical particles: Highly resolved simulations

Derksen

2019

AIChE Journal

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We perform three-dimensional, time-dependent simulations of dense, fluidized suspensions of solid cylindrical particles in a Newtonian liquid in fully periodic domains. The resolution of the flow field is an order of magnitude finer than the diameter of the cylindrical particles. At their surfaces no-slip conditions are applied through an immersed boundary method (IBM), coupled to the lattice-Boltzmann method that is used as the fluid flow solver. The marker points of the IBM are also used to detect and perform collisions between the cylinders. With these particle-resolved simulations, we study the effects of the aspect ratio of the cylinders and the solids volume fraction on the superficial slip velocity between fluid and solids, on the solids velocity fluctuations, as well as on the orientation of the cylinders. The aspect ratio (length over diameter of the cylinders) ranges from 0.5 to 4, the solids volume fraction goes up to 0.48. Reynolds numbers based on average settling velocity are of the order of 1-10. At constant Archimedes number, we observe only minor sensitivities of the settling Reynolds number on the aspect ratio.

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Non-spherical particles in a pseudo-2D fluidised bed: Modelling study

Cited by 60 publications

References 54 publications

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

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

Fluidization of spherical versus elongated particles: Experimental investigation using magnetic particle tracking

Liquid fluidization with cylindrical particles: Highly resolved simulations

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