Suspension and turbulence modification effects of solid particulates on a horizontal turbulent channel flow

Kiger, Ken; Pan, Chong

doi:10.1088/1468-5248/3/1/019

Cited by 116 publications

(146 citation statements)

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“…Some thorough reviews and studies on turbulence modulation in particle laden flows are present in the literature (Balachandar & Eaton, 2010;Crowe, Troutt & Chung, 1996;Hosokawa & Tomiyama, 2004;Kiger & Pan, 2002).…”

Section: Turbulence Modulationmentioning

confidence: 99%

Settling Suspensions Flow Modelling: A Review

Silva

Garcı́a

Faia

et al. 2015

KONA

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In spite of the widespread application of settling suspensions, their inherent complexity has yet to be properly predicted by a unified numerical model or empirical correlation, and usually industries still possess customized charts or data for their particular suspension. This is, clearly, rather inefficient and can lead to oversized dimensioning, low energy efficiency and even operation limitations/difficulties. In this manuscript a review of empirical correlations, charts and numerical models that have been employed to predict the behaviour of settling suspensions is briefly described, providing information on the advantages and drawbacks of each method. Their evolution throughout the years: from Durand and Condolios correlations, to empirical models by Wasp, single phase simplifications with mixture properties by Shook and Roco, and to other Euler-Euler or Euler-Lagrangian numerical models, will be presented. Some considerations on recent particle migration and turbulence modification publications will be added. In addition, information about some current CFD application of LatticeBoltzmann and Discrete Element Method (DEM) will be given. Lastly, data from CFD modelling employed by the authors that is able to predict turbulence attenuation in settling flows with medium sized particles for different concentrations is reported.

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Section: Turbulence Modulationmentioning

confidence: 99%

Settling Suspensions Flow Modelling: A Review

Silva

Garcı́a

Faia

et al. 2015

KONA

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“…Accurate three-dimensional, time-dependent simulations together with precise experiments are required to gain physical insights on the effect of the flow on particles distribution and of particles on the flow field. The simplest computational approach to investigate on dispersed flows is to consider particles as passive species under the one-way coupling assumption, which is valid for dilute flows characterized by volume fraction Φ V < 10 −3 and mass fraction Φ M < 10 −3 [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…When particles segregate in specific flow regions, the dilute flow assumption is no longer valid locally. In particular, if particles are heavy (solid/liquid in gas), their overall volume may be negligible, yet the momentum coupling with the fluid may be such to induce significant modifications in the flow field [2,15,16,17]. These effects will modify flow transport properties which eventually will change particle distribution.…”

Section: Introductionmentioning

confidence: 99%

Turbulence Modulation by Micro-Particles in Boundary Layers

Picciotto

Giusti

Marchioli

et al.

Fluid Mechanics and Its Applications

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Summary. Turbulent dispersed flows over boundary layers are crucial in a number of industrial and environmental applications. In most applications, the key information is the spatial distribution of inertial particles, which is known to be highly non-homogeneous and may exhibit a complex pattern driven by the structures of the turbulent flow field. Theoretical and experimental evidence shows that fluid motions in turbulent boundary layers are intermittent and have a strongly organized and coherent nature represented by the large scale structures. These structures control the transport of the dispersed species in such a way that the overall distribution will resemble not at all those given by methods in which these motions are ignored.In this paper, we study from a statistical viewpoint turbulence modulation produced by different-size dispersed particles and we examine how particle wall accumulation is modified due to the action of particles themselves in modulating turbulence. The physical mechanisms and the statistics proposed are based on Direct Numerical Simulation of turbulence and Lagrangian particle tracking, considering a two-way coupling between particles and fluid.

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“…It is noteworthy that most of the available experimental knowledge on the interaction between a turbulent flow and a suspension of solid particles comes either from measurements of the liquid phase in water channel or pipe flows or from measurements of the distribution of solid particles in a nearly homogeneous turbulent air flows. A few exceptions regard the cases in which solid particles were tracked simultaneously with the fluid phase ( PTV combined with PIV measurements in water channel flows, Kiger & Pan, 2002) and the case of the study of particle settling velocity in oscillating grid turbulence in water (e.g. Yang & Shy 2003).…”

Section: Introductionmentioning

confidence: 99%

Particle-Laden Flow

Geurts¹,

Clercx²,

Uijttewaal³

2007

ERCOFTAC Series

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PrefaceThe dispersion of particles in a flow is of central importance in various geophysical and environmental problems. The spreading of aerosols and soot in the air, the growth and dispersion of plankton blooms in seas and oceans, or the transport of sediment in rivers, estuaries and coastal regions are striking examples.These problems are characterized by strong nonlinear coupling between several dynamical mechanisms such as convective sweeping, rotation, buoyancy, bio-physical influences and interactions between particles and fluid. As a result, processes on widely different length and time scales are simultaneously of importance. These range from Kolmogorov scales at which the flow at particle-scales is central, to much larger-scale structures that can be appreciated best via satellite observations. The multiscale nature of this challenging field motivated this colloquium that was organized by the recently established Dutch Platform for Geophysical and Environmental Fluid-mechanics (PGEF). The meeting took place at the University of Twente (the Netherlands), June 21-23, 2006. In total 55 participants from 13 different countries and 4 different continents contributed to the colloquium. The six keynote speakers provided reviews and recent research findings of areas that were central to the theme of the colloquium. These keynote lectures constituted the framework for the rest of the program, which contained 33 contributed papers, several of which are collected in this book.Issues related to the large-scale environmental aspects of particle-laden flows were addressed by considering turbulence modulation arising in high density clay-laden flows, and by focussing on transport processes in the stratosphere and its relevance to climate and weather predictions. Fundamental aspects of transport of particles formed the topic of the second day of the colloquium. Insights from experimental and computational research were combined to understand the distortion of flow in the neighborhood of embedded particles. Aspects of Lagrangian statistics in turbulence were discussed at length, addressing the dispersion of embedded point particles. Bridging the environ-VI Preface mental and the fundamental aspects of particle-laden flows was the topic of the final day of the colloquium. The Lagrangian dispersion of particles in the context of their environmental setting was presented. The closing lecture provided a synopsis of transport processes in particle-laden flow in which possibilities of multi-resolution, multi-physics modeling and monitoring were discussed.The colloquium on particle-laden flow was organized under the auspices of EUROMECH, the European Mechanics Society, and the Universities of Technology of Delft, Eindhoven and Twente. It was supported financially by a number of institutions: ERCOFTAC (European Research Council On Flow, Turbulence and Combustion), COST Action P20 'LES-AID' (COoperation in the field of Science and Technology), the Netherlands foundation for fundamental research of matter (FOM), the Netherland...

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Suspension and turbulence modification effects of solid particulates on a horizontal turbulent channel flow

Cited by 116 publications

References 19 publications

Settling Suspensions Flow Modelling: A Review

Settling Suspensions Flow Modelling: A Review

Turbulence Modulation by Micro-Particles in Boundary Layers

Particle-Laden Flow

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