Analysis of collision effects for turbulent gas-particle flow in a horizontal channel. Part II. Integral properties and validation

Sommerfeld, Martin; Kussin, J.

doi:10.1016/s0301-9322(03)00033-8

Cited by 62 publications

(16 citation statements)

References 6 publications

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“…In dilute flow assumptions, the two-way coupling -particles feedback onto the flow field -will also add just quantitative corrections and the weak flow modulation [26,43] will not modify substantially the quality of the physical model [47]. However, for industrial applications, current research lines will have to consider specifically the influence of particle-particle interactions and of accurate models for particle coalescence and collisions [19,61,63,64,69]. S ij is the rate-of-strain tensor and describes the rate at which an infinitesimal control volume of fluid changes shape.…”

Section: Discussionmentioning

confidence: 99%

Particles turbulence interactions in boundary layers

Soldati

2005

Z Angew Math Mech

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Turbulent dispersed flows in boundary layers are crucial in a number of industrial and environmental applications. In most applications, the key information is space distribution of particles which is known to be strongly non-homogeneous. Specifically, inertial particles distribute preferentially avoiding strong vortical regions and segregating into straining regions. The vortical boundary layer structures control momentum, mass, heat, and particle transfer. Coherent structures bring particles toward the wall and away from the wall and favour particle segregation in the viscous region giving rise to nonuniform particle distribution profiles which peak close to the wall. The reason for this behavior is particle inertia, which filters the high frequency turbulence fluctuations. The object of this work is to review the current understanding of turbulent boundary layer dynamics and to examine the mechanisms for particle transfer, segregation, and preferential distribution. The physical mechanisms discussed and proposed are based on Direct Numerical Simulations of turbulence and Lagrangian tracking of inertial particles.

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Section: Discussionmentioning

confidence: 99%

Particles turbulence interactions in boundary layers

Soldati

2005

Z Angew Math Mech

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“…Particles will first be accelerated towards the wall by the gravity and then bounced off to the opposite direction as they touch the wall. After bouncing off, small particles with low momentum may not be able to cross the near wall flow structures and remain in the wall region until being entrained away by the local flow; while large particles with high enough momentum may be bounced off directly to the main flow region (Sommerfeld et al [16,35,36]). That is to say, in a certain wall-normal section, the high inertial particles may move either upward or downward.…”

Section: Turbulence Intensitiesmentioning

confidence: 99%

Experimental investigation on turbulence modification in a horizontal channel flow at relatively low mass loading

Wang

Liu

et al. 2006

ACTA MECH SINICA

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Particle-laden flows in a horizontal channel were investigated by means of a two-phase particle image velocimetry (PIV) technique. Experiments were performed at a Reynolds number of 6 826 and the flow is seeded with polythene beads of two sizes, 60 µm and 110 µm. One was slightly smaller than and the other was larger than the Kolmogorov length scale. The particle loadings were relatively low, with mass loading ratio ranging from 5×10 −4 to 4×10 −2 and volume fractions from 6×10 −7 to 4.8×10 −5 , respectively. The results show that the presence of particles can dramatically modify the turbulence even under the lowest mass loading ratio of 5×10 −4 . The mean flow is attenuated and decreased with increasing particle size and mass loading. The turbulence intensities are enhanced in all the cases concerned. With the increase of the mass loading, the intensities vary in a complicated manner in the case of small particles, indicating complicated particle-turbulence interactions; whereas they increase monotonously in the case of large particles. The particle velocities and concentrations are also given. The particles lag behind the fluid in the center region but lead in the wall region, and this trend is more prominent for the large particles. The streamwise particle fluctuations are larger than the gas fluctuations for both sizes of particles, however their varying trend with the mass loadings is not so clear. The wallnormal fluctuations increase with increasing mass loadings. They are smaller in the 60 µm particle case but larger in the 110 µm particle case than those of the gas phase. It seems that the small particles follow the fluid motion to certain extent while the larger particles are more likely dominated by their own inertia. Finally, remarkable non-uniform distributions of particle concentration are observed, especially for the large

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“…The distribution of the particle velocity and concentration at the surface shows the principle of the Eulerian model capable of prediction the dilute particles which is described by Lagrangian method. The evaluation of pressure 18 on the surface by the parameters predicted directly from the simulation give an efficient engineering tools for the wear of the particle-laden pipelines.…”

Section: Resultsmentioning

confidence: 99%

“…Tsuji et al [14,15,16] used Lagrangian simulation to predict the continuous bounce of particles in a horizontal pipe under the influence of gravity with an abnormal bouncing model and the three-dimensional collision model for a particle of arbitrary shape with a flat wall. Sommerfeld et al [17,18] used a Lagrangian method to analyse the collision between spherical solid particles in a horizontal channel with a rough wall as well as inter-particle collisions. Squires et al [19] studied the effect of wall roughness on dispersed phase properties of particle laden turbulent channel flow using discrete particle simulation for the particulate phase.…”

Section: Introductionmentioning

confidence: 99%