Clarkson U. | CRCD | ME 537 | Aerosols | Particle Deposition Mechanisms


Aerosols

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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.