Modelling the motion of cylindrical particles in a nonuniform flow

Yin, Chungen; Rosendahl, Lasse; Kær, Søren Knudsen; Sörensen, Henrik

doi:10.1016/s0009-2509(03)00214-8

Cited by 140 publications

(104 citation statements)

References 14 publications

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“…For a prolate spheroid with an aspect ratio of 2.5, the authors reported that the drag coefficient could decrease by up to 37%, and increase by up to 75%, depending on the orientation of the flow. Zastawny et al's [5] application of DNS for non-spherical particles further validated the models and algorithms used in [1,2], demonstrating that such models can be applied to both cylindrical and ellipsoidal particles.…”

Section: Introductionmentioning

confidence: 96%

“…This over-simplifies the problem, however, and is not able to accurately predict the motion of large non-spherical particles and their interaction with the carrier flow [1]. Greater success has been achieved [1,2] when the complete behaviour of non-spherical particles in turbulent flow is accounted for, with this requiring that (i) the lift and drag forces as a function of particle size, shape and orientation, (ii) the rotational motion caused by different torque terms and (iii) particle preferential orientation all be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…Yin et al [1,2] considered shape factor-and orientation-dependent drag and lift forces, and particle rotation, in modelling biomass as cylindrical particles in the design of wall-fired burners using co-firing of biomass. The authors implemented a modified Ganser [3] drag coefficient, where the particle size was quantified using the equivalent volume diameter, the particle shape characterized using the particle sphericity, and the aspect ratio, and the orientation dependence accounted for by using the projected area.…”

Section: Introductionmentioning

confidence: 99%

“…Yin et al [2] validated their model by comparing its predictions with data from experimental studies of the motion of a cylindrical PVC particle in initially stagnant water, in which the undisturbed water became non-uniform under the effect of the settling of a large PVC particle. The authors [2] reported excellent agreement with data, while Yin et al [1] found that the cylindrical particle trajectories differ significantly from those of perfect spheres of the same equivalent diameter.…”

Section: Introductionmentioning

confidence: 99%

“…The authors derived correlations of drag, lift and torque coefficients based on the models applied in [1,2], and direct numerical simulations. They reported that for a flow with a shear Reynolds number of 300, the drag coefficient of a prolate spheriod with an aspect ratio of 1.25 increases by up to 20% (depending on the orientation to the flow) compared to the drag coefficient of a sphere.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of Shape on Inertial Particle Dynamics in a Channel Flow

Njobuenwu

Fairweather

2013

Flow Turbulence Combust

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Particle dynamics in a channel flow are investigated using large eddy simulation and a Lagrangian particle tracking technique. Following validation of single-phase flow predictions against DNS results, fluid velocities are subsequently used to study the behaviour of particles of differing shape assuming one-way coupling between the fluid and the particles. The influence of shape-and orientation-dependent drag and lift forces on both the translational and rotational motion of the particles is accounted for to ensure accurate representation of the flow dynamics of non-spherical particles. The size of the particles studied was obtained based on an equivalent-volume sphere, and differing shapes were modelled using super-quadratic ellipsoid forms by varying their aspect ratio, with their orientation predicted using the incidence angle between the particle relative velocity and the particle principal axis. Results are presented for spherical, needle-and platelet-like particles at a number of different boundary layer locations along the wall-normal direction within the channel.The time evolution and probability density function of selected particle translational and rotational properties show a clear distinction between the behaviour of the various particles types, and indicate the significance of particle shape when modelling many practically relevant flows.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Shape on Inertial Particle Dynamics in a Channel Flow

Njobuenwu

Fairweather

2013

Flow Turbulence Combust

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Large eddy simulation of inertial fiber deposition mechanisms in a vertical downward turbulent channel flow

Njobuenwu

Fairweather

2017

AIChE Journal

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The deposition pattern of elongated inertial fibres in a vertical downward turbulent channel flow is predicted using large eddy simulation and Lagrangian particle tracking. Three dominant fibres deposition mechanisms are observed, namely, diffusional deposition for small inertial fibres, free-flight deposition for large inertial fibres, and the interception mechanism for very elongated fibres. The fibres are found to exhibit orientation anisotropy at impact, which is strongly dependent on the fibre elongation. An increase in the fibre elongation increases the wall capture efficiency by the interception mechanism. The diffusional deposition mechanism is shown to dominate for fibres with large residence time,

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Numerical simulation on movement behaviours of cylindrical particles in a circulating fluidized bed

Cai

Zhao

et al. 2018

Can J Chem Eng

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The movement behaviours of cylindrical particles in a circulating fluidized bed were studied with a three‐dimensional multi‐way coupled model of cylindrical particle flow. In this model, the translation and rotation of individual cylindrical particles were solved directly by Newton‐Euler dynamics. The interaction between cylindrical particles was handled in line with rigid impact dynamics and the modified Nanbu collision probability method. The coupling algorithm between the motion of cylindrical particles and turbulent flow was disposed using the correlation between Lagrangian time scales and the k−ϵ closure model. Numerical simulation indicates that cylindrical particles in the near‐wall region reach the exit of the riser faster than those in other regions. The majority of collisions between cylindrical particles occur in the annular region between the central and near‐wall regions. In the horizontal direction, the horizontal velocity components of cylindrical particles vary slightly and distribute randomly, whilst the vertical velocity component exhibits produced variation from the near‐wall region to the central region. Further, the rotation of a cylindrical particle around its axis is shown to be significantly weaker than those around the two other orthometric axes. The collisions of cylindrical particles affect the distribution of horizontal velocity components of cylindrical particles more evidently.

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Modelling the motion of cylindrical particles in a nonuniform flow

Cited by 140 publications

References 14 publications

Effect of Shape on Inertial Particle Dynamics in a Channel Flow

Effect of Shape on Inertial Particle Dynamics in a Channel Flow

Large eddy simulation of inertial fiber deposition mechanisms in a vertical downward turbulent channel flow

Numerical simulation on movement behaviours of cylindrical particles in a circulating fluidized bed

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