AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Numerical Study of Thermophoresis Effects on Particle Dispersion in a Turbulent Channel Flow Using the V2F Turbulence Model
Mohammad Majlesara, Mazyar Salmanzadeh, GOODARZ AHMADI, Shahid Bahonar University of Kerman
Abstract Number: 666 Working Group: Indoor Aerosols
Abstract A computational model for simulating the instantaneous anisotropic velocities in a 2-D turbulent channel flow was developed. The V2F turbulence model of FLUENT code was used for evaluating the mean flow field and the anisotropic turbulence intensities. The Kraichnan method for generating continuous Guassian random field was extended and used for simulating the instantaneous anisotropic velocity fluctuations in the channel. The Lagrangian particle tracking approach was used for analyzing the particle movements. The Stokes drag, lift, Brownian, gravity, and thermophoretic forces were included in the particle equation of motion. The Brownian force was simulated using a white noise stochastic process model. The effect of anisotropic turbulence fluctuations and thermophoresis on the transport and dispersion of particles of different sizes emitted from point sources in the channel was studied. The simulation results showed that, when small particles are sufficiently close to the wall, the thermophoretic force significantly affects the particle motion.