ME 405
Fall 2006
Professor John M. Cimbala Lecture 42
12/15/2006
This is the last lecture! ☺ Today, we will:
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Continue our discussion of impaction between moving particles (spray chambers,
scrubbers, etc.) in Section 9.3
Discuss filtration in Section 9.4
If time, discuss electrostatic precipitators in Section 9.5
Do Candy Questions for Candy Friday
Section 9.3 – Spray Chambers (continued from the end of the previous lecture):
Collector drop:
diameter = Dc, velocity = vc (downward)
Aerosol particles: diameter = Dp, velocity = vp (upward)
Qa
scrubbing liquid in
cleaned air out
cout = cL
Qs
spray nozzles
Dc, ρc
L
G
vc
c + dc, z + dz
dz
Adz
c, z
G
G
vp = Ua
Dp, ρp
Qs
G
Ua
scrubbing liquid out
Qa
dirty air in
cin = c0
z