Particle movement behavior and capture mechanism in a corrugated cooling channel

The cooling channel can capture both the droplets and particles in the industrial waste gas. The flow field and particle motion in the corrugated cooling channel were numerically simulated and the capture mechanism was investigated. Submicron and micron particles are captured under the actions of thermophoresis and inertia, coupling with turbulence, respectively. The capture probability shows a high distribution for particles near the wall, and a low distribution for particles in the central area. The deposition probability density distribution of particles on the channel wall changes periodically along the flow direction. The overall capture efficiency decreases first and then increases with increasing particle size for submicron particles, in the range of 40% to 50%, and it keeps increasing with particle size for micron particles, reaching 77% for 10 μm particles. A corrugated cooling channel performs well in capturing particulate matter with the help of thermophoresis and inertia coupled with turbulence.