Clarkson U. | CRCD | ME 637 | Aerosols | Particle Deposition Mechanisms


Aerosols

Introduction to Aerosols \| Drag, Lift Forces \| Aerosol Kinetics \| Virtual Mass, Basset Forces & BBO Equation \| Nonspherical Particles \| Brownian Motions \| Particle Deposition Mechanisms \| Electrodynamics \| Aerosol Coagulation \|

Particle Deposition Mechanisms: Impaction

Rebounds

Particles striking a surface at high speed could rebound. It may be shown that for normal impact

. (5)

Figure 2. Variation of the velocity ratio with normal impact velocity for different coefficients of restitution (r=0.9, r=0.9, r=0.8, r=0.8).

When , the particle cannot overcome the surface attractive force. The corresponding critical approach velocity is given by

(6)

For velocities less than , the particle will stick to the surface.