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Deposition, Adhesion, and Release of Bioaerosols

  • H. Hollis Wickman

Abstract

Bioaerosols typically consist of a range of particle sizes and shapes. Further, each particle, even if it is a single, “simple” bacterium, may have a complex surface morphology. The degree of hydration as well as the size of the particle or cluster often changes with time after the aerosol is generated. This can lead to significant changes in its mechanical, elastic, or surface properties. For such reasons, it is not possible to provide a detailed picture of all types of bioaerosol-surface interactions. To approximate the situation, it is necessary to introduce several simplifying assumptions, which are guided by knowledge of less complex aerosol systems.

Keywords

Aerosol Particle Aerosol Deposition Brownian Diffusion Hamaker Constant Contact Deformation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Symbols Used

A

Hamaker constant

A(t)

random force

a, b

ellipse axes

Cs

Cunningham slip correction factor

D

particle surface distance

DE

Einstein diffusion coefficient

d

particle diameter

Eg

gravitational energy

Ei

collector efficiency

ET

thermal energy

Fr

Froude number

Fp.o.

pull-off force

fg

gravitational force

fv

friction force

fs

LvdW force

g

gravitational constant

h

characteristic distance

kB

Boltzmann constant

LvdW

London-van der Waals

m

particle mass

Ng

gravity number

Pe

Peclet number

p

pressure

P0

equilibrium liquid vapor pressure

Q

electric charge

qe

electron charge

R

gas constant

Re

Reynolds number

r

particle radius

rm

mean radius of curvature

St

Stokes number

T

temperature

t

time

U

contact potential

U0

free-stream velocity

V

volume

v

particle velocity

vc

critical capture velocity

vg

deposition velocity

vs

terminal velocity

xs

stopping distance

x2

mean square particle displacement

Y

compressibility modulus

yc

critical parameter for impaction on spherical collector

α

dynamical shape constant

γ

surface tension, or surface energy

0

permittivity of free space

η

air viscosity

ν

kinematic viscosity

ρ

particle mass density

σ

Schmidt number

τ

relaxation time

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© Chapman & Hall, Inc. 1994

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  • H. Hollis Wickman

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