Particulate deposition from turbulent parallel streams

Abstract

Abstract A theory is developed for the rate of particulate deposition from turbulent gas streams onto surfaces. Three characteristic times—the particle relaxation time, the turbulent fluctuation time, and the particle residence time—control the deposition mode. Two phenomena are primarily responsible for transport of the particles across the laminar sublayer and deposition: (1) the momentum imparted to the particle by the fluid turbulence; and (2) the thermospheresis caused by the temperature gradient near the wall. Interaction of the three characteristic times with these two phenomena is analyzed, and the particle deposition rate in turbulent pipe flow is computed. The findings are found to be in close agreement with available experimental data.