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Arabian Journal for Science and Engineering

, Volume 39, Issue 3, pp 2353–2361 | Cite as

Effects of Particles Collision on Separating Gas–Particle Two-Phase Turbulent Flows

  • Sihao Lv
  • Weihua Yang
  • Xiangli LiEmail author
  • Guohui Li
Research Article - Mechanical Engineering
  • 148 Downloads

Abstract

A second-order moment two-phase turbulence model incorporating a particle temperature model based on the kinetic theory of granular flow is applied to investigate the effects of particles collision on separating gas–particle two-phase turbulent flows. In this model, the anisotropy of gas and solid phase two-phase Reynolds stresses and their correlation of velocity fluctuation are fully considered using a presented Reynolds stress model and the transport equation of two-phase stress correlation. Experimental measurements (Xu and Zhou in ASME-FED Summer Meeting, San Francisco, Paper FEDSM99-7909, 1999) are used to validate this model, source codes and prediction results. It showed that the particles collision leads to decrease in the intensity of gas and particle vortices and takes a larger effect on particle turbulent fluctuations. The time-averaged velocity, the fluctuation velocity of gas and particle phase considering particles collision are in good agreement with experimental measurements. Particle kinetic energy is always smaller than gas phase due to energy dissipation from particle collision. Moreover, axial–axial and radial–radial fluctuation velocity correlations have stronger anisotropic behaviors.

Keywords

Second-order moment model Particles collision Separating gas–particle two-phase turbulent flows Kinetic theory of granular flow Numerical simulation 

List of Symbols

D

Diffusion term

G

Source term

k

Kinetic energy

P

Production term

p

Pressure

R

Correlation term

t

Time

V, v

Velocity

Greek Symbols

α

Volume fraction

δ

Kronic-Delta unit tensor

\({\varepsilon}\)

Dissipation term

μ

Dynamic viscosity

ν

Kinematic viscosity

Π

Pressure–strain term

ρ

Density

τ

Stress

Subscripts

ijkl

Coordinates directions

g,p

Gas and particle

l

Laminar

r

Relaxation

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Copyright information

© King Fahd University of Petroleum and Minerals 2013

Authors and Affiliations

  1. 1.College of Chemistry and Environmental EngineeringDongGuan University of TechnologyDongguanChina
  2. 2.College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina
  3. 3.Faculty of Infrastructure EngineeringDalian University of TechnologyDalianChina
  4. 4.School of Electronic and Information EngineeringDalian Jiaotong UniversityDalianChina
  5. 5.Clean Combustion Research CenterKing Abdullah University Science and Technology of Saudi ArabiaThuwalKingdom of Saudi Arabia

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