Particulate Impact and Erosion in a Turbulent Serpentine Channel

摘要: Surface roughness often arises in consequence of erosion by particulate impact. We have studied particle impact turbulent channel flow direct numerical simulation (DNS). The is S-shaped, with periodicity between inlet and exit; hence, it an infinite serpentine. bend fairly tight: its diameter equal to the width. There a separation bubble downstream bend. A range masses was simulated. Stokes numbers ranged from 0.5 6.0. In straight, flow, eddies are responsible for On Reynolds averaged level, turbophoresis has been given credit literature. curved channel, inertia may be dominant cause However, convection still important. This depends on relative magnitude time-scales. role more complex than turbophoresis. this paper we able only report our empirical findings. Transport serpentine geometry number. Heavier particles create plume that leaves inner flows toward outer wall. Turbulence then spreads away wall, forming region high concentration next surface. used formula compare distribution impacts erosion. Erosion velocity angle. maximum not number impacts. Higher form intense plumes thicker layers Lighter plume, but layer remains thin, reminiscent plane flow.