On the influence of near-wall forces in particle-laden channel flows

Arcen, Boris; Tanière, Anne; Oesterlé, B.

doi:10.1016/j.ijmultiphaseflow.2006.06.009

Cited by 64 publications

(31 citation statements)

References 19 publications

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“…Arcen et al 33 showed that wall-correction forces ͑drag and lift͒ have negligible effect on the statistics of spherical particles for response times of the order considered in the present paper.…”

Section: ͑25͒mentioning

confidence: 54%

Dynamics of prolate ellipsoidal particles in a turbulent channel flow

Mortensen¹,

Andersson²,

Gillissen³

et al. 2008

Physics of Fluids

159

122

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The dynamical behavior of tiny elongated particles in a directly simulated turbulent flow field is investigated. The ellipsoidal particles are affected both by inertia and hydrodynamic forces and torques. The time evolution of the particle orientation and translational and rotational motions in a statistically steady channel flow is obtained for six different particle classes. The focus is on the influence of particle aspect ratio and the particle response time on the particle dynamics, i.e., distribution, orientation, translation, and rotation. Both ellipsoidal and spherical particles tend to accumulate in the viscous sublayer and preferentially concentrate in regions of low-speed fluid velocity. The translational motion is practically unaffected by the aspect ratio, whereas both mean and fluctuating spin components depend crucially on . The ellipsoids tend to align themselves with the mean flow direction and this tendency becomes more pronounced in the wall proximity when the lateral tilting of the elongated particles is suppressed.

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Section: ͑25͒mentioning

confidence: 54%

Dynamics of prolate ellipsoidal particles in a turbulent channel flow

Mortensen¹,

Andersson²,

Gillissen³

et al. 2008

Physics of Fluids

159

122

View full text Add to dashboard Cite

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“…Inclusion of additional forces such as gravity and lift 44,45 or incorporation of two-way coupling effects would just add quantitative corrections within the range of parameters examined-particle dimension (see Table I for details), density, and concentration-and would not modify the quality of the model. 24 …”

Section: B Equations For the Dispersed Phase And Lagrangian Particlementioning

confidence: 99%

Anisotropy in pair dispersion of inertial particles in turbulent channel flow

et al. 2012

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The rate at which two particles separate in turbulent flows is of central importance to predict the inhomogeneities of particle spatial distribution and to characterize mixing. Pair separation is analyzed for the specific case of small, inertial particles in turbulent channel flow to examine the role of mean shear and small-scale turbulent velocity fluctuations. To this aim an Eulerian-Lagrangian approach based on pseudo-spectral direct numerical simulation (DNS) of fully developed gas-solid flow at shear Reynolds number Re τ = 150 is used. Pair separation statistics have been computed for particles with different inertia (and for inertialess tracers) released from different regions of the channel. Results confirm that shear-induced effects predominate when the pair separation distance becomes comparable to the largest scale of the flow. Results also reveal the fundamental role played by particles-turbulence interaction at the small scales in triggering separation during the initial stages of pair dispersion. These findings are discussed examining Lagrangian observables, including the mean square separation, which provide prima facie evidence that pair dispersion in non-homogeneous anisotropic turbulence has a superdiffusive nature and may generate non-Gaussian number density distributions of both particles and tracers. These features appear to persist even when the effects of shear dispersion are filtered out, and exhibit strong dependency on particle inertia. Application of present results is discussed in the context of modelling approaches for particle dispersion in wall-bounded turbulent flows. C 2012 American Institute of Physics. [http://dx

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“…Lubrication negligibly affects the deposition of aerosols. 19 However, it may significantly reduce the deposition of hydrosols as the dynamic viscosity of liquids is orders of magnitude larger than the dynamic viscosity of gases.…”

Section: Introductionmentioning

confidence: 99%

Analysis of non‐Brownian particle deposition from turbulent liquid‐flow

et al. 2015

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International audienceThe deposition of non-Brownian particles from turbulent liquid-flow onto channel walls is numerically analyzed. Theapproach combines Lagrangian particle tracking with a kinematic model of the near-wall shear layer. For nonbuoyantparticles, direct interception is the main deposition mechanism and the deposition velocity scales as the particle diameter(in wall units) to the power of 1.7. When wall/particle hydrodynamic interactions are taken into account, the depositionvelocity is significantly reduced and the correction factor scales as the cubic root of the wall roughness to particlediameter ratio. For buoyant particles, sedimentation is usually the predominant deposition mechanism and the hydrodynamicinteractions significantly affect the deposition velocity when the drainage characteristic time driven by buoyancyis of the order of the particle residence time close to the wall. Last, a wall-function for the suspended particles is proposed

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On the influence of near-wall forces in particle-laden channel flows

Cited by 64 publications

References 19 publications

Dynamics of prolate ellipsoidal particles in a turbulent channel flow

Dynamics of prolate ellipsoidal particles in a turbulent channel flow

Anisotropy in pair dispersion of inertial particles in turbulent channel flow

Analysis of non‐Brownian particle deposition from turbulent liquid‐flow

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