Effect of particle concentration on fluctuating velocity of the disperse phase for turbulent pipe flow

Varaksin, A. Yu.; Polezhaev, Yu. V.; Polyakov, A. F.

doi:10.1016/s0142-727x(00)00045-x

Cited by 40 publications

(9 citation statements)

References 12 publications

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“…For the radial and theta fluctuations, their magnitudes are less than the single-phase fluctuations and decrease with increasing particle size. Lower solid radial fluctuating velocities were also measured in other works in the intermediate and inertia-dominated regime (Hardalupas et al 1989;Alajbegović et al 1994;Kulick et al 1994;Varaksin et al 2000). However, Shokri et al (2017) measured radial particle fluctuations that were higher than their single-phase fluctuations.…”

Section: Velocity Profilesmentioning

confidence: 69%

“…The x-axis is the log of the solids concentration (% v/v) and the y-axis is the Stokes number. Elghobashi 1983;Hardalupas et al 1989;Mostafa et al 1989;Kulick et al 1994;Varaksin, Polezhaev & Polyakov 2000;Caraman et al 2003;Boree & Caraman 2005;Hadinoto et al 2005), but at higher concentrations there are only a few references to the authors' knowledge (Alajbegović et al 1994;Kussin & Sommerfeld 2002;Hosokawa & Tomiyama 2004;Chemloul & Benmedjedi 2010;Shokri et al 2017). Notwithstanding their value, these datasets are limited to concentrations below 0.8 % v/v (Kussin & Sommerfeld 2002;Shokri et al 2017), or are incomplete as they lack information from the single phase (Alajbegović et al 1994) or one of the phases (Hosokawa & Tomiyama 2004;Chemloul & Benmedjedi 2010).…”

Section: Introductionmentioning

confidence: 99%

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

Mena

Curtis

2019

J. Fluid Mech.

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Section: Velocity Profilesmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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

Mena

Curtis

2019

J. Fluid Mech.

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“…Consequently, the gas flow does not significantly affect the shearing of particles to the wall. In this case, considering v = const, c p0 = const, the differential equation (4) has the following general solution:…”

Section: Methodsmentioning

confidence: 99%

“…The effect of particle concentration on fluctuating velocity of the disperse phase for turbulent pipe flow was investigated in the paper [4]. As a result, experimental investigations of the fluctuation velocity distributions of solid particles were presented for the gas turbulent pipe flow.…”

Section: Literature Reviewmentioning

confidence: 99%

Solving the Nonstationary Problem of the Disperse Phase Concentration during the Pneumoclassification Process of Mechanical Mixtures

Pavlenko¹,

Yukhymenko²,

Lytvynenko³

et al. 2019

JES

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The article dials with studying of the gas-dispersed systems classification process in gravitation pneumoclassifiers of prismatic shape. The aim of the research is to determine operating parameters of the investigated process. Recent research is based on the previously developed mathematical model of hydrodynamics for a gasdispersed flow in a vertical channel with variable cross-section. As a development of this study, a physical model based on the process of kinetic removal from the mixture was used. This process is caused by the removal of fine particles from the weighed layer in the case of theirs low velocities in comparison with the average gas flow velocity. This model also considers the inertial effect due to the kinetic energy of fine particles removed from the surface of the weighted later. The first order linear nonhomogeneous partial differential equation describing the unsteady process of changing the dispersed phase concentration in the gas-mechanical mixture by channel height was solved by mathematical modeling using the combination of direct and inverse Laplace transforms. As a result, for the first time the general solution was obtained for for non-trivial boundary and initial conditions. This fact allowed developing the mathematical model of the nonstationary problem for the disperse phase concentration during the pneumoclassification process of mechanical mixtures in pneumoclassifiers. The model allows determining the concentration of fine fraction of the gas-dispersed mixture by channel height in operating volume of the device, as well as evaluating time of the pneumoclassification process. Particularly, it was found that the dispersed phase concentration decreases by the height of the apparatus with respect to time. This fact proves the possibility of effective separation of components in gas-mechanical mixtures. Finally, the achieved results allow proposing the engineering technique for calculations of vertial-type gravitation pneumoclassifiers.

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“…Features of the dynamic slip of solid particles in the pulsation motion were revealed in [9][10][11]. The value of the indicated slip is determined by the particle iner tia with respect to the turbulence characteristic time scale (Stokes number in the pulsation motion).…”

Section: Introductionmentioning

confidence: 99%

About choice of particle parameters for visualization and diagnostics of free concentrated air vortices

2014

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The problem of the choice of parameters (density, size) of particle inertia for visualization and diagnostics of free vortices of various intensities (characteristic velocity, vortex funnel diameter) is considered. The dimensionless criterion (Stokes number) is used, which determines the peculiarities of solid particles behavior in concentrated vortex structures. An example of the choice of particle parameters for visualization of a laboratory simulated air vortex funnel and debris cloud is described.

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Effect of particle concentration on fluctuating velocity of the disperse phase for turbulent pipe flow

Cited by 40 publications

References 12 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

Solving the Nonstationary Problem of the Disperse Phase Concentration during the Pneumoclassification Process of Mechanical Mixtures

About choice of particle parameters for visualization and diagnostics of free concentrated air vortices

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