Journal ArticleDOI
The effect of small particles on fluid turbulence in a flat‐plate, turbulent boundary layer in air
Chris Rogers,John K. Eaton +1 more
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In this article, the results of both an experimental and an analytical investigation of the response of a two-dimensional, turbulent boundary layer in air to the presence of particles were presented.Abstract:
This paper describes the result of both an experimental and an analytical investigation of the response of a two‐dimensional, turbulent boundary layer in air to the presence of particles. Copper shot, 70 μm in diameter, were uniformly introduced into a vertical boundary layer, at a momentum thickness Reynolds number of about 1000. The particle mass flux was set at 20% of the fluid mass flux, and all measurements were made using a single‐component, forward‐scatter laser Doppler anemometer. The measurements clearly demonstrated that the particles damped fluid turbulence, apparently affecting all scales equally. The measurements further showed a strong correlation between the degree of damping and the particle concentration in the log region of the boundary layer.read more
Citations
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Turbulent Dispersed Multiphase Flow
S. Balachandar,John K. Eaton +1 more
TL;DR: A review of the current state-of-the-art experimental and computational techniques for turbulent dispersed multiphase flows, their strengths and limitations, and opportunities for the future can be found in this paper.
Journal ArticleDOI
Particle response and turbulence modification in fully developed channel flow
TL;DR: In this paper, the interactions between small dense particles and fluid turbulence have been investigated in a downflow fully developed channel in air, at particle mass loadings up to 80% by laser Doppler anemometry.
Journal ArticleDOI
An Euler-Lagrange strategy for simulating particle-laden flows
TL;DR: A strategy capable of simulating polydisperse flows in complex geometries is employed where the fluid transport equations are solved in an Eulerian framework and the dispersed phase is represented as Lagrangian particles.
Journal ArticleDOI
Direct numerical simulation of turbulence modulation by particles in isotropic turbulence
TL;DR: In this article, the effect of particles on the turbulence was included in the Navier-Stokes equations using the point-force approximation in which 963 particles were used in the calculations.
Journal ArticleDOI
Numerical simulation of particle interactions with wall turbulence
Y. Pan,S. Banerjee +1 more
TL;DR: In this paper, the effects of near-neutral density solid particles on turbulent liquid flow in a channel were investigated by using a pseudo-spectral method to calculate the velocity disturbance caused by the particles assuming the flow around them is locally Stokesian.
References
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Journal ArticleDOI
Particle response and turbulence modification in isotropic turbulence
Kyle D. Squires,John K. Eaton +1 more
TL;DR: In this paper, the effect of turbulence on particle concentration fields and the modification of turbulence by particles has been investigated using direct numerical simulations of isotropic turbulence, where the particle motion was computed using Stokes' law of resistance and the particle volume fraction was negligible.
Journal ArticleDOI
LDV measurements of an air-solid two-phase flow in a vertical pipe
TL;DR: In this paper, the authors measured air and solid-particle velocities in a vertical pipe two-phase flow by the use of a laser-Doppler velocimeter (LDV) and found that the smaller the particle size, the flatter the mean air velocity distribution for the same mass flow ratio of solids to air.
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Turbulent Diffusion of Heavy Particles in the Atmosphere
TL;DR: In this article, the authors discuss the likely differences between the diffusion of gaseous and particulate matter in the atmosphere, as would be observed by fixed point instruments (absolute diffusion).
Journal ArticleDOI
A two‐equation turbulence model for two‐phase flows
Said Elghobashi,T. W. Abou-Arab +1 more
TL;DR: In this article, a two-equation turbulence model was developed for predicting two-phase flows, which describes the conservation of turbulence kinetic energy and dissipation rate of that energy for the carrier fluid.
Journal ArticleDOI
LDV measurements of an air–-solid two-phase flow in a horizontal pipe
Yutaka Tsuji,Yoshinobu Morikawa +1 more
TL;DR: In this article, a laser-Doppler velocimeter (LDV) was used to measure air and solid velocities in an air-solid two-phase flow in a horizontal pipe.