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

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Abstract

A two-fluid particle-wall collision model with consideration of wall roughness is proposed. It takes into account the effects of the friction, restitution and in particular the wall roughness, and hence the redistribution of Reynolds stress in different directions, the absorption of turbulent energy from the mean motion and the attenuation of particle motion by the wall. The proposed model is used to simulate sudden-expansion and swirling gas-particle flows and is validated by comparing with expermental results. The results show that the proposed model gives better results than those obtained by the presently used zero-gradient condition. Hence, it is suggested that the proposed model should be used as the wall boundary condition for the particle phase in place of the presently used boundary condition.

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Abbreviations

d :

diameter

e :

restitution coefficient

f :

friction coefficient

n :

number density

R :

radius of flow chamber

r :

radial coordinate

u :

axial velocity

v :

velocity component, normal or radial velocity

w :

tangential velocity

x :

axial coordinate

α′:

virtual wall inclination

1,2:

before and after collision

i:

inner field

in:

inlet value

p:

particle phase

w:

wall value

−:

time-average

′:

turbulent fluctuation

″:

RMS value

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Authors and Affiliations

  1. Department of Engineering Mechanics, State Key Laboratory of Clean Coal Combustion, Tsinghua University, 100084, Beijing, China

    Zhou Lixing & Zhang Xia

Authors
  1. Zhou Lixing
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  2. Zhang Xia
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Additional information

The project supported by the Special Funds for the Major State Basic Research, China (G-1999-0222-08)

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Lixing, Z., Xia, Z. Simulation of sudden-expansion and swirling gas-particle flows using a two-fluid particle-wall collision model with consideration of the wall roughness. Acta Mech Sinica 20, 447–454 (2004). https://doi.org/10.1007/BF02484266

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  • DOI: https://doi.org/10.1007/BF02484266

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