Simulation of sudden-expansion and swirling gas-particle flows using a two-fluid particle-wall collision model with consideration of the wall roughness

2004 ◽  
Vol 20 (5) ◽  
pp. 447-454 ◽  
Author(s):  
Zhou Lixing ◽  
Zhang Xia
Keyword(s):  
Fluid Particle ◽  
Sudden Expansion ◽  
Wall Roughness ◽  
Collision Model ◽  
Particle Flows ◽  
Wall Collision ◽  
Two Fluid

Simulation of Gas-Particle Channel Flows Using a Two-Fluid Particle-Wall Collision Model Accounting for Wall Roughness

2003 ◽  
Author(s):  
X. Zhang ◽  
L. X. Zhou
Keyword(s):  
Kinetic Energy ◽  
Channel Flows ◽  
Fluid Particle ◽  
Wall Friction ◽  
Wall Roughness ◽  
Reynolds Stresses ◽  
Collision Model ◽  
Wall Collision ◽  
Pdpa Measurement ◽  
Two Fluid

A two-fluid particle-wall collision model accounting for wall roughness is proposed. It accounts for the effects of wall friction, restitution, in particular the wall roughness, and hence the redistribution of particle Reynolds stresses in different directions at the wall, the absorption of turbulent kinetic energy from the kinetic energy of mean motion at the wall and the attenuation of particle motion by the wall. It gives the effect of wall roughness on the particle turbulence. The proposed model is applied to simulate gas-particle horizontal channel flows and is validated using PDPA measurement results. It is shown that presently used zero-gradient boundary conditions and other collision models of particle phase might give false results.

A quadrature-based moment method for dilute fluid-particle flows

2008 ◽  
Vol 227 (4) ◽  
pp. 2514-2539 ◽  
Author(s):  
O. Desjardins ◽  
R.O. Fox ◽  
P. Villedieu
Keyword(s):  
Moment Method ◽  
Fluid Particle ◽  
Particle Flows

Verification of filtered two-fluid models for gas-particle flows in risers

AIChE Journal ◽  
2010 ◽  
Vol 57 (10) ◽  
pp. 2691-2707 ◽  
Author(s):  
Yesim Igci ◽  
Sankaran Sundaresan
Keyword(s):  
Fluid Models ◽  
Particle Flows ◽  
Two Fluid

Three-Dimensional Simulation of Cross-Flow Microfilter Fouling in Tortuous Pore Profiles With Semisynthetic Metalworking Fluids

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Bingyi Yu ◽  
Shiv G. Kapoor ◽  
Richard E. DeVor
Keyword(s):  
Colloidal Particles ◽  
Three Dimensional ◽  
Particle Trapping ◽  
Collision Model ◽  
Flux Decline ◽  
Cake Layer ◽  
Trapping Model ◽  
Wall Collision ◽  
Dimensional Simulation ◽  
Layer Development

Fouling mechanisms and models for flux decline are investigated with a three-dimensional simulation of the tortuous, verisimilar geometry of an α-alumina microfilter. Reconstruction of the three-dimensional geometry was accomplished from two-dimensional cross-sectional cuts. A wall collision model and a particle trapping model are developed for the investigation of fouling mechanisms. The reconstructed geometry and the two models were used in computational fluid dynamics to simulate metalworking colloidal particles travelling through and becoming trapped in the tortuous pore paths of a microfilter. Results reveal sharp flux decline initiating from partial pore blocking and subdued flux decline transitioning to cake layer development with steady-state flow. This flow behavior is in agreement with experimental data from earlier studies. The inclusion of the wall collision model and particle trapping model enabled the revelation of cake layer development as a fouling mechanism. Additional simulations of microfilters at different particle size distributions were conducted and discussed.

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