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Green Chemical Engineering
book

Green Chemical Engineering

by S. Suresh, S. Sundaramoorthy
December 2014
Intermediate to advanced content levelIntermediate to advanced
541 pages
17h 38m
English
CRC Press
Content preview from Green Chemical Engineering
220 Green Chemical Engineering
uid. Whereas in an ideal PFR, the tracer material, while it is being carried along by the
bulk uid moving at velocity ū, does not spread in the axial direction. In a PFR with axial
mixing characteristics, the gradual spreading (dispersion) of the tracer material in the axial
direction after a time lapse of θ
1
, θ
2
and θ
3
(θ
3
> θ
2
> θ
1
) from the time of injection of tracer is
depicted in Figure 3.60. The dispersion ux of the tracer material J (kmol/m
2
s) is written as
JD
dC
dz
=−
(3.320)
where dC/dz is the tracer concentration gradient and D is the dispersion coefcient
expressed in the unit m
2
/s. D = 0 for an ideal ...
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Publisher Resources

ISBN: 9781466558830