Preferential concentration of heavy particles in compressible isotropic turbulence

2016 ◽  
Vol 28 (5) ◽  
pp. 055104 ◽  
Author(s):  
Qingqing Zhang ◽  
Han Liu ◽  
Zongqiang Ma ◽  
Zuoli Xiao
Keyword(s):  
Isotropic Turbulence ◽  
Heavy Particles ◽  
Preferential Concentration

Effect of preferential concentration on the settling velocity of heavy particles in homogeneous isotropic turbulence

2002 ◽  
Vol 468 ◽  
pp. 77-105 ◽  
Author(s):  
A. ALISEDA ◽  
A. CARTELLIER ◽  
F. HAINAUX ◽  
J. C. LASHERAS
Keyword(s):  
Settling Velocity ◽  
Isotropic Turbulence ◽  
Volume Fraction ◽  
Concentration Field ◽  
Temporal Distribution ◽  
Local Concentration ◽  
Heavy Particles ◽  
Flow Measurements ◽  
Preferential Concentration ◽  
Decaying Turbulence

The behaviour of heavy particles in isotropic, homogeneous, decaying turbulence has been experimentally studied. The settling velocity of the particles has been found to be much larger than in a quiescent fluid. It has been determined that the enhancement of the settling velocity depends on the particle loading, increasing as the volume fraction of particles in the flow increases. The spatial and temporal distribution of the particle concentration field is shown to exhibit large inhomogeneities. As the particles interact with the underlying turbulence they concentrate preferentially in certain regions of the flow. A characteristic dimension of these particle clusters is found to be related to the viscous scales of the flow. Measurements of the settling velocity conditioned on the local concentration of particles in the flow have shown that there is a monotonic increase in the settling velocity with the local concentration (the relation being quasi-linear). A simple phenomenological model is proposed to explain this behaviour.

Pair dispersion and preferential concentration of particles in isotropic turbulence

2003 ◽  
Vol 15 (6) ◽  
pp. 1776 ◽  
Author(s):  
Leonid I. Zaichik ◽  
Vladimir M. Alipchenkov
Keyword(s):  
Isotropic Turbulence ◽  
Preferential Concentration

Acceleration of heavy particles in isotropic turbulence

2008 ◽  
Vol 34 (9) ◽  
pp. 865-868 ◽  
Author(s):  
Leonid I. Zaichik ◽  
Vladimir M. Alipchenkov
Keyword(s):  
Isotropic Turbulence ◽  
Heavy Particles

Particle Dispersion in Fine Scales of Homogeneous Isotropic Turbulence

2007 ◽  
Author(s):  
M. Sato ◽  
M. Tanahashi ◽  
T. Miyauchi
Keyword(s):  
Isotropic Turbulence ◽  
Major Axis ◽  
Stokes Number ◽  
High Energy ◽  
Energy Dissipation Rate ◽  
Particle Dispersion ◽  
Fine Scale ◽  
Number Density ◽  
Homogeneous Isotropic Turbulence ◽  
Preferential Concentration

Direct numerical simulations of homogeneous isotropic turbulence laden with particles have been conducted to clarify the relationship between particle dispersion and coherent fine scale eddies in turbulence. Dispersion of 106 particles are analyzed for several particle Stokes numbers. The spatial distributions of particles depend on their Stokes number, and the Stokes number that causes preferential concentration of particles is closely related to the time scale of coherent fine scale eddies in turbulence. On the plane perpendicular to the rotating axes of fine scale eddies, number density of particle with particular Stokes number is low at the center of the fine scale eddy, and high in the regions with high energy dissipation rate around the eddy. The maximum number density can be observed at about 1.5 to 2.0 times the eddy radius on the major axis of the fine scale eddy.

Preferential concentration of heavy particles in a turbulent channel flow

1994 ◽  
Vol 6 (11) ◽  
pp. 3742-3749 ◽  
Author(s):  
John R. Fessler ◽  
Jonathan D. Kulick ◽  
John K. Eaton
Keyword(s):  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Heavy Particles ◽  
Preferential Concentration
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