Numerical analysis on flow field and particle deposition on a heated spinning disk

Abstract

Numerical analysis was conducted to characterize the flow field and particle deposition on a horizontal spinning disk with thermophoretic effect under the laminar flow field. The particle transport mechanism considered were convection, Brownian diffusion, gravitational settling and thermophoresis. The averaged particle deposition velocities and their radial distributions for the upper surface of the disk were calculated from the particle concentration equation in an Eulerian frame of reference for the spinning speeds of 0–1000 rpm and the temperature differences of 0–5 K. It was observed from the numerical results that the rotation effect of disk increased the averaged deposition velocities, and enhanced the uniformity of local deposition velocities on the upper surface compared with those of the stationary disk. It was also shown that the heating of the disk with Δ T = 5 K decreased deposition velocity over a fairly broad range of particle sizes. Finally, an approximate deposition velocity model for the spinning disk was suggested. The comparison of the present numerical results with those of the approximate model and the available experimental results showed relatively good agreement between them.