Numerical modeling of gas-particle flows in vertical pipes and the particle collision effect

Kartushinskii, A. I.; Michaelides, Efstathios E.; Rudi, Ylo

doi:10.1007/s10697-005-0008-5

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…Several studies suggest to consider the particle collision with the cavity wall; due to the migration of particles towards the wall ( [14,16]). Hence, In this study, we considered hard particle collision with the cavity wall as reported in ( [17,22]). The restitution coefficient is considered as 0.9.…”

Section: Fluid Streamlinesmentioning

confidence: 99%

An improved mathematical model for the sedimentation of microplastic particles in a lid-driven cavity with obstacle

Roy,

Götz,

Wiyaja

et al. 2020

Preprint

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In this paper, we developed a mathematical model for the sedimentation process of small particles in a lid-driven cavity flow with an obstacle to model the transport of microplastic particles in rivers. A stationary incompressible Navier-Stokes simulation at moderate Reynolds-numbers provides the background flow field. Spherical particles are injected into this flow field and their equation of motion is solved to determine the number of particles that sediment on the surface of the obstacle. To capture the effect of typical biological organisms and biofilms on the bottom surface of river beds, the obstacle can exert an attraction force onto the particles. Various simulations and parameter studies are carried out to determine the influence of the obstacle geometry, particle densities, and the attraction force on the sedimentation process.

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Section: Fluid Streamlinesmentioning

confidence: 99%

An improved mathematical model for the sedimentation of microplastic particles in a lid-driven cavity with obstacle

Roy,

Götz,

Wiyaja

et al. 2020

Preprint

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“…El-Behery et al . [16] [17] [18] concluded that wasted gangues, subjected to various types of loading, eventually accelerated to a peak and constant speed, at which the impact load on the suspended buffer was the largest. As a conservative estimation, the peak speed was adopted as the out-of-pipe speed of gangues.…”

Section: Numerical Model For the Dynamic Response Of Suspended Buffmentioning

confidence: 99%

Analysis of the nonlinear dynamic response of guide rails for a suspended buffer

Tai

Guo

et al. 2019

PLoS ONE

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Guide rails’ nonlinear dynamic response to the collision process between gangues and the suspended buffer is the basis for its intensity examination and fatigue prediction. This paper established a numerical model for simulating the dynamic response of buffer’s guide rails using Pro/E and Femap based on an analysis of the basic structural components of the suspended buffer. The effects of the gangues diameter and feeding rate on the guide rails’ dynamic response were investigated, which were mainly revealed by a tension in guide rails. Simulation results showed that the tension in guide rails rapidly increased to a peak value after the suspended buffer was impacted by gangues, followed by a periodic vibration. The peak tension, maximum and minimum tensions within the periodic vibration were exponential functions of the gangues diameter. And they depended linearly on the feeding rate. The vibration frequency of the tension in guide rails was an exponential function of the gangues diameter but did not depend on the feeding rate. Based on the backfilling workface parameters used in D.Ping coal miner’s 15601 working panel, the feeding rate of 500 t/h was selected. The diameter of the crushed gangues was selected to be 50 mm based on the strength of guide rails. Their expected service life is 54.2 years. Finally, an industrial test was performed in D.Ping coal miner’s 15601 working panel and the guide rails operated steadily. The measured vibration parameters of the tension in guide rails agree well with that of numerical predictions, which verified the reliability of the numerical model to some extent.

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“…For specifying the boundary conditions for the rebounding stream (i = 4-6) on the bottom wall (y = 0 in the reference frame for this stream), we use [18]. As in [22], we will find the relation between the linear and angular velocities of the impinging particles (i = 1-3) on the bottom wall (y = h in the reference frame for the impinging stream) and those of the similar rebounding particles (i = 4-6) with account for slip (the velocities of the rebounding particles are denoted by double primes).…”

Section: Equations Of Motion Of the Impinging And Rebounding Streams mentioning

confidence: 99%

“…In this study, the closure of the equations is based on the original interparticle collision model proposed in [11], in which an averaging method was developed and analytical formulas for the pseudoviscous coefficients were obtained. In contrast to [13][14][15][16][17], in which the suppression of turbulence by the particles was described, in [12] both the generation and the dissipation of turbulence due to the presence of the particles were taken into account, and the model was tested by calculating vertical two-phase flows [18].…”

mentioning

confidence: 99%

Modeling of high-concentration gas-particle flow in a horizontal channel

Kartushinskii¹,

Michaelides²,

Rudi³

2006

Fluid Dyn

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A model of the motion of an admixture of polydisperse solid particles in a horizontal plane channel with account for particle deposition on the bottom wall is presented. The dispersed phase, consisting of six particle fractions characterized by the particle size and the mass concentration, is modeled in Eulerian form. Interparticle collisions occur due to the difference in the velocities of average motion of the fractions and to particle velocity fluctuations. It is important to take interparticle collisions into account for flows with a high particle mass loading (in the model, up to 50 kg per kg of gas) and because of the gravity-induced particle accumulation on the bottom wall. To ensure a correct description of the particle-wall collisions, impinging and rebounding particle streams with the corresponding restitution coefficients for the normal and tangential particle velocities and friction are introduced. The calculations are compared with experiments [1]. upper signs of "∓" and "±" refer to the impinging stream and the lower ones to the rebounding stream. Equations (2.1) and (2.2) are the projections of the equation of

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Numerical modeling of gas-particle flows in vertical pipes and the particle collision effect

Cited by 8 publications

References 9 publications

An improved mathematical model for the sedimentation of microplastic particles in a lid-driven cavity with obstacle

An improved mathematical model for the sedimentation of microplastic particles in a lid-driven cavity with obstacle

Analysis of the nonlinear dynamic response of guide rails for a suspended buffer

Modeling of high-concentration gas-particle flow in a horizontal channel

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