Effect of turbulence on particle and bubble slip velocity

Ghatage, Swapnil V.; Sathe, Mayur J.; Doroodchi, Elham; Joshi, Jyeshtharaj B.; Evans, Geoffrey M.

doi:10.1016/j.ces.2013.03.031

Cited by 22 publications

(3 citation statements)

References 62 publications

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“…At the higher Reynolds number, the diminution in solid shear and the increase in particle collisions dominate, increasing the relative velocity with concentration. Such a complex relationship involving relative velocity, Reynolds number and concentration, as well as particle properties, has been well noted in the literature (Brucato, Grisafi & Montante 1998;Ghatage et al 2013).…”

Section: Effects Of the Solids Concentrationmentioning

confidence: 68%

Experimental data for solid–liquid flows at intermediate and high Stokes numbers

Mena

Curtis

2019

J. Fluid Mech.

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Section: Effects Of the Solids Concentrationmentioning

confidence: 68%

Experimental data for solid–liquid flows at intermediate and high Stokes numbers

Mena

Curtis

2019

J. Fluid Mech.

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“…No clear picture concerning the effect of background turbulence in the liquid phase has emerged yet. The literature that is available, however, suggests that the drag coefficient should rather increase, which means the rise velocity will decrease (see, for example, Okawa et al [60], Ghatage et al [61]).…”

Section: Critical Assessment Of the Drag Force Modellingmentioning

confidence: 99%

Baseline Model for Bubbly Flows: Simulation of Monodisperse Flow in Pipes of Different Diameters

Kriebitzsch

Rzehak

2016

Fluids

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CFD simulations of the multiphase flow in technical equipment are feasible within the framework of interpenetrating continua, the so-called two-fluid modelling. Predictions with multiphase CFD are only possible if a fixed set of closures for the interfacial exchange terms is available that has been validated for a wide range of flow conditions and can therefore reliably be used also for unknown flow problems. To this end, a baseline model, which is applicable for adiabatic bubbly flow, has been specified recently and has been implemented in OpenFOAM. In this work, we compare simulation results obtained using the baseline model with three different sets of experimental data for dispersed gas-liquid pipe flow. Air and water under similar flow conditions have been used in the different experiments, so that the main difference between the experiments is the variation of the pipe diameter from 25 mm to 200 mm. Gas fraction and liquid velocity are reasonably well reproduced, in particular in the bulk of the flow. Discrepancies can be seen in the turbulent kinetic energy, the gas velocity and in the wall peaks of the gas fraction. These can partly be explained by the simplified modelling, but to some extent must be attributed to uncertainty in the experimental data. The need for improved near-wall modelling, turbulence modelling and modelling of the bubble size distribution is highlighted.

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“…On the above basis, some formulas have been provided for describing the momentum exchange coefficient between liquid and solid phases, based on the hypothesis of a pseudo-fluid for the solids [24][25][26][27]. Other empirical equations have also been studied for predicting the settling velocity of particles in suspension [28][29][30][31][32]. All of these investigations are for the purpose of exploring the laws governing multiphase flow motion and can provide some reference for TBS study.…”

Section: Introductionmentioning

confidence: 99%

Numerical Studies on Teeter Bed Separator for Particle Separation

et al. 2020

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Teeter Bed Separators (TBS) are liquid–solid fluidized beds that are widely used in separation of coarse particles in coal mining industry. The coal particles settle in the self-generating medium bed resulting in separation according to density. Due to the existence of self-generating medium beds, it is difficult to study the sedimentation of particles in TBS through experiments and detection methods. In the present research, a model was built to investigate the bed expansion characteristics with water velocity based on the Euler–Euler approach, and to investigate the settling of foreign particles through bed based on the Euler–Lagrange approach in TBS. Results show that the separation of in TBS should be carried out at low water velocity under the condition of stable fluidized bed. Large particles have a high slip velocity, and they are easily flowing through the bed into the light product leading to a mismatch. The importance of self-generating bed on separation of particle with narrow size ranges are clarified. The model provides a way for investigating the separation of particles in a liquid–solid fluidized bed and provides suggestions for the selection of operation conditions in TBS application.

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Effect of turbulence on particle and bubble slip velocity

Cited by 22 publications

References 62 publications

Experimental data for solid–liquid flows at intermediate and high Stokes numbers

Experimental data for solid–liquid flows at intermediate and high Stokes numbers

Baseline Model for Bubbly Flows: Simulation of Monodisperse Flow in Pipes of Different Diameters

Numerical Studies on Teeter Bed Separator for Particle Separation

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