Numerical Simulation of Particulate Motion in Turbulent Gas-Solid Channel Flow

Peskin, Richard L.; Kau, C.J.

doi:10.1115/1.3448969

Cited by 9 publications

(1 citation statement)

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“…More exact numerical simulations of dispersed flows are beginning to appear which avoid the approximations and empiricism of turbulence models, cf. Peskin and Kau, 42 Moore and Davis, 43 and Davis et al 44 However, these methods are currently limited to relatively simple, idealized problems due to limitations of computation time and costs; therefore, they do not offer a viable approach for most practical dispersedflow problems or for evaluation using existing experimental results.…”

Section: Analysis Of Turbulencementioning

confidence: 99%

Mixing, transport and combustion in sprays

Faeth

1987

Progress in Energy and Combustion Science

352

161

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Al~traet-Recent advances concerning analysis of sprays and drop/turbulence interactions are reviewed. Consideration is given to dilute sprays and related dilute dispersed flows, which contain well-defined dispersed-phase elements (e.g. spherical drops) and have dispersed-phase volume fractions less than 1%; and to the near-injector, dense spray region, having irregularly-shaped liquid elements and relatively-high liquid fractions. Early analysis of dilute sprays and other dispersed flows assumed either locally-homogeneous flow (LHF), implying infinitely-fast interphase transport rates, or deterministic separated flow (DSF) where finite interphase transport rates are considered, but interactions between dispersed-phase elements and turbulence are ignored. These limits are useful in some instances; however, recent evidence shows that both methods are deficient for quantitative estimates of the structure of most practical dispersed flows, including sprays. As a result, stochastic separated flow (SSF) methods have been developed, which treat both finite interphase transport rates and dispersed phase (drop)/turbulence interactions using random-walk computations for the dispersed phase. Evaluation of SSF methods for particle-laden jets; nonevaporating, evaporating and combusting sprays; and noncondensing and condensing bubbly jets has been encouraging, suggesting capabilities of current SSF methods to treat a variety of interphase processes. However, current methods are relatively ad hoc and many fundamental problems must still be resolved for dilute flows, e.g. effects of anisotropic turbulence, modification of continuous-phase turbulence properties by the dispersed phase (turbulence modulation), effects of turbulence on interphase transport rates, and drop shattering, among others. Dense sprays have received less attention and are poorly understood due to substantial theoretical and experimental difficulties, e.g. the idealization of spherical drops is not realistic, effects of liquid breakup and collisions are difficult to describe, spatial resolution is limited and the flow is opaque to optical diagnostics which have been helpful for studies of dilute sprays. Limited progress thus far, however, suggests that LHF analysis may provide a useful first-approximation of the structure and mixing properties of dense sprays near pressure-atomizing injectors. Since dense-spray processes fix initial conditions needed to rationally analyze dilute sprays, more research is this area is clearly warranted. CONTENTS Nomenclature 294 Yuu et al. 25 : round 0.0008~0.004t 11,000-56,000 Air particle-laden jet McComb and Salih 2~' 27 : Small* 5,000-15,000 Air round particle-laden jet Laats and Frishman28'29: 0.3-1.4' 66,000-137,000 Air round particle-laden jet Levy and Lockwood3°: 1.14 3.50* 20,000 Air round particle-laden jet Shuen et a/.31:

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Section: Analysis Of Turbulencementioning

confidence: 99%

Mixing, transport and combustion in sprays

Faeth

1987

Progress in Energy and Combustion Science

352

161

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Zur Bewegung feiner Partikeln, die in turbulent strömenden Medien suspendiert sind

Ebert¹

1983

Chemie Ingenieur Technik

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Motion of fine grained particles, suspended in turbulent flow.This article considers the motion of particles, suspended in turbulent flow. Iftheparticlesaresufficiently small to respond t o turbulence, their motion includes stochastic components. Concerning processes like air classification or separation of fine powders the stochastic contribution -characterized by the conception of a particle diffusivity -the particle motion exhibits a detrimental influence. Sharpness of cut and separation efficiency are reduced. The paper aims to present the state of the art in particle diffusion. First, theoretical investigations are reported, attention being focused on the equation of motion of the particle which is the link between the motion of the fluid and the motion of the particle. Then, experimental results are reviewed. The following tendencies can be seen : Particles which response t o turbulence of fluid flow show increasing diffusivity with increasing inertia. Field forces like gravity or electrical field forces exhibit a damping effect on diffusivity.

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A transition state model for predicting the rate of erosive wear of ductile materials by solid particles

Humphrey

1980

Wear

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Numerical Simulation of Particulate Motion in Turbulent Gas-Solid Channel Flow

Cited by 9 publications

References 0 publications

Mixing, transport and combustion in sprays

Mixing, transport and combustion in sprays

Zur Bewegung feiner Partikeln, die in turbulent strömenden Medien suspendiert sind

A transition state model for predicting the rate of erosive wear of ductile materials by solid particles

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