L3 Two-Phase Gas-Solid Flow

Sommerfeld, Martin; Wirth, Karl‐Ernst; Muschelknautz, Ulrich

doi:10.1007/978-3-540-77877-6_85

Cited by 4 publications

(2 citation statements)

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“…The acceleration, velocity, and location of a discrete particle are calculated at each time step by numerical integration of Equation (3). The general form of the drag force F D acting on a particle developed for a wide range of Reynolds numbers is expressed in terms of a drag coefficient C D , which is [23]:…”

Section: Mathematical Modelsmentioning

confidence: 99%

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Effect of Surface Topography on Particle Deposition from Liquid Suspensions in Channel Flow

Zaw¹,

Zhu²,

Ma³

2020

Fluids

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A Eulerian—Lagrangian model has been developed to simulate particle attachment to surfaces with arc-shaped ribs in a two-dimensional channel flow at low Reynolds numbers. Numerical simulation has been performed to improve the quantitative understanding of how rib geometries enhance shear rates and particle-surface interact for various particle sizes and flow velocities. The enhanced shear rate is attributed to the wavy flows that develop over the ribbed surface and the weak vortices that form between adjacent ribs. Varying pitch-to-height ratio can alter the amplitude of the wavy flow and the angle of attack of the fluid on the ribs. In the presence of these two competing factors, the rib geometry with a pitch-to-height ratio of two demonstrates the greatest shear rate and the lowest fraction of particle attachment. However, the ribbed surfaces have negligible effects on small particles at low velocities. A force analysis identifies a threshold shear rate to reduce particle attachment. The simulated particle distributions over the ribbed surfaces are highly non-uniform for larger particles at higher velocities. The understanding of the effect of surface topography on particle attachment will benefit the design of surface textures for mitigating particulate fouling in a wide range of applications.

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Section: Mathematical Modelsmentioning

confidence: 99%

“…where ρ p is the density of the particle. The pressure gradient force resulted from local pressure change is important for solid particles suspended in liquid [23]:…”

Section: Mathematical Modelsmentioning

confidence: 99%