Investigations on inward flow between two stationary parallel disks

Singh, Achhaibar; Vyas, B. D.; Powle, U. S.

doi:10.1016/s0142-727x(98)10058-9

Cited by 27 publications

(13 citation statements)

References 21 publications

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“…Equations (8) and (9) in dimensionless form are also obtained using the scales of the velocity U 0 and the length H. By integrating system (11), we determined he particle velocity components and found the trajectory of a test particle in accordance with Eq. (10).…”

Section: Modeling Of Nonstationary Motion Of Particles and The Procesmentioning

confidence: 99%

“…Then, knowing the probability of a particle of each ith initial powder fraction falling into the small fraction, we can construct a probability Tromp separation curve using both deterministic and stochastic methods for calculating the separation of particles by size. (4); curves refer to the calculation results, and points refer to the experimental data [9].…”

Section: Modeling Of Nonstationary Motion Of Particles and The Procesmentioning

confidence: 99%

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Effects of gas flow and turbulent diffusion on the centrifugal classification of fine particles

Shvab

Sadretdinov

Brendakov

2012

J Appl Mech Tech Phy

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Tthe mass movement of fine particles and changes in their trajectories under the effect of centrifugal, gravitational, and aerodynamic forces is studied by numerical modeling of turbulent swirling flow. The effect of turbulent migration of solid particles due to pulsating gas flow velocities on the aerodynamics of particles and, consequently, on the efficiency of the process of separation of particles by size is analyzed. The studies revealed the behavior laws of probability curve of separation of particles by size and showed the effect of regime and geometric parameters on the process of classification of fine powders.There are various methods of separating finely dispersed media, the most promising of which are centrifugal pneumatic methods, allowing a significant improvement in production intensity and a reduction of energy consumption and making the process of producing powder products more environmentally friendly.Centrifugal air separation of particles is a very complex process that depends on a number of physical, structural, and operational characteristics. In general, the motion of an ensemble of polydisperse particles is determined by the force interaction of the particles with gas flow, the exchange of momentum in collisions of particles with each other, the effect of the geometry and walls of the device, the effect of pulsations of the carrier medium due to turbulence, and other physicomechanical phenomena. It is known that such motion of two-phase flow is both deterministic and random in nature.The most important parameter affecting the process of centrifugal separation of particles by size is the volume concentration of the solid phase in the gas flow. Experimental and theoretical studies have shown that high efficiency of size separation of particles can be achieved only at small volume concentrations of the solid phase. This allows one to simplify the mathematical formulation of the problem under study. Indeed, the interaction of solid particles and the force effect of the particles on the carrier flow can be neglected at small concentrations of the solid phase [1]. At the same time, fine particles are involved in the pulsating motion of the gas phase in turbulent swirling flow. This phenomenon of turbulent migration of particles violates the deterministic nature of their motion and causes a stochastic distribution of particles in the vortex chamber, thereby reducing the efficiency of their separation by size [2]. Therefore, these effects should be taken into account when constructing a mathematical model for the centrifugal separation of fine solid particles. PHYSICAL FORMULATION OF THE PROBLEMThe process of separation of particles by size can be described by Tromp's separation curve, which characterizes the probability of particles falling into the fine or coarse fractions. The critical particle size δ * , which controls

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Section: Modeling Of Nonstationary Motion Of Particles and The Procesmentioning

confidence: 99%

Section: Modeling Of Nonstationary Motion Of Particles and The Procesmentioning

confidence: 99%

Effects of gas flow and turbulent diffusion on the centrifugal classification of fine particles

Shvab

Sadretdinov

Brendakov

2012

J Appl Mech Tech Phy

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Section: Calculationmentioning

confidence: 99%

“…The reliability and efficiency of the method developed was verified through test and numerical calculations [10] and also through comparisons with the experimental data [11] for a turbulent flow between plane-parallel disks in the direction from the periphery toward the axis. The experimental data [11] are compared in Fig. 3 with the calculated dependence of the dimensionless radial velocity component u r /U 0 (U 0 is the constant value of the radial velocity at the entrance to the spatial area between the disks) on the dimensionless coordinate z/H at r 0 /H = 10, Re = U 0 H/ν 0 = 1269, and different values of the radius.…”

Section: Calculationmentioning

confidence: 99%

“…The rotor velocity is additionally monitored by a stroboscope and recorded by a ChZ-33 frequency meter. The mass flow of air is measured by the method proposed in [4] (1), dispenser for the initial material (2), dustseparation system consisting of a cyclone collector (3) and a filter (4), control unit (5), injection device (6), swiveling nozzles (7), differential manometer (8), cylindrical probe (9), inclined differential manometer (10), and traversing gear (11). registered by a differential manometer.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of a swirled turbulent flow in the separation zone of a centrifugal air separator

Shvab

Zyatikov

Sadretdinov

et al. 2010

J Appl Mech Tech Phy

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A mathematical model of a swirled turbulent flow in the separation zone of a pneumatic centrifugal device is presented. The model is based on the known k-ω model of turbulence proposed by Wilcox. The influence of rotation of the separation-zone walls, input swirl of the gas flow, and other characteristic parameters on the mean velocity field is demonstrated. A comparison of parameters is performed, which reveals good agreement between the numerical and experimental results for a turbulent fluid flow between parallel disks.

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On near‐wall jets in a disc‐like gas vortex unit

et al. 2016

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in Wiley Online Library (wileyonlinelibrary.com) To clarify the three-dimensional (3D) structure of near-wall jets observed in disc-like gas vortex units (GVUs), experimental and numerical studies are performed. The experimental results are obtained using stereoscopic particle image velocimetry (PIV), laser doppler anemometry, pressure probes and surface oil flow visualization techniques. The first three techniques have been used to investigate the bulk flow hydrodynamics of the vortex unit. Surface oil flow visualization is adopted to visualize streamlines near the end-walls of the vortex unit. The surface streamlines help to determine the azimuthal and radial velocity components of the radial near-wall jets. Simulations of the vortex unit using FLUENT V R v.14a are simultaneously performed, computationally resolving the near-wall jet regions in the axial direction. The simulation results together with the surface oil flow visualization establish the 3D structure of the near-wall jets in GVUs for the first time in literature. It is also conjectured that the near-wall jets develop due to the combined effect of bulk flow acceleration and swirl. The centrifugal force diminishes in the vicinity of the end-walls. The radially inward pressure gradient in these regions, no longer balanced by the centrifugal force, pushes gas radially inward thus developing the near-wall jets.

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Investigations on inward flow between two stationary parallel disks

Cited by 27 publications

References 21 publications

Effects of gas flow and turbulent diffusion on the centrifugal classification of fine particles

Effects of gas flow and turbulent diffusion on the centrifugal classification of fine particles

Numerical study of a swirled turbulent flow in the separation zone of a centrifugal air separator

On near‐wall jets in a disc‐like gas vortex unit

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