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LARGE EDDY SIMULATION OF FINE PARTICLE DEPOSITION IN THERMALLY STRATIFIED TURBULENT CHANNEL FLOW

Yu-Hong Dong
Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China

Yimin Tang
Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China

Lin-Feng Chen
Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China

Abstrakt

The dispersion and thermophoresis sedimentation of small inertial particles in a stably stratified turbulent channel flow are studied by means of large eddy simulation. The Lagrangian tracking approach is used to describe the dynamics of particles. Numerical results show that the thermophoresis strengthens the deposition of particles near the cold wall while it weakens the deposition near the hot wall. With the Richardson number increases, the particle mean velocity increases regularly in the core of the channel, and the particle fluctuations intensities decrease under the effect of the buoyancy flux. The magnitude of the thermophoretic forces on particles decreases in the stable thermally stratified flow, which results in smaller deposition rate with increasing the Richardson number.