| Title |
Analysis on Particle Deposition onto a Heated Rotating Disk with Electrostatic Effect |
| Keywords |
Rotating disk ; 회전원판 ; Particle deposition velocity ; 입자침착속도 ; Thermophoresis ; 열열동 ; Electrophoresis ; 정전영동 ; Boltzmann charge distribution ; 볼쯔만 전하분포 ; Approximate deposition velocity model ; 침착속도 근사모델 |
| Abstract |
Numerical analysis has been conducted to characterize deposition rates of aerosol particles onto a heated, rotating disk with electrostatic effect under the laminar flow field. The particle transport mechanisms considered were convection, Brownian diffusion, gravitational settling, thermophoresis and electrophoresis. The aerosol particles were assumed to have a Boltzmann charge distribution. The electric potential distribution needed to calculate local electric fields around the disk was calculated from the Laplace equation. The Coulomb, the image, the dielectrophoretic and the dipole-dipole forces acting on a charged particle near the conducting rotating disk were included in the analysis. The averaged particle deposition velocities and their radial distributions on the upper surface of the disk were calculated from the particle concentration equation in a Eulerian frame of reference, along with a rotation speed of 0～1,000rpm, a temperature difference of 0～5K and a charged disk voltage of 0～1,000V. Finally, an approximate deposition velocity model for the rotating disk was suggested. The present numerical results showed relatively good agreement with the results of the present approximate model and the available experimental data. |