Transport Phenomena in Bioreactors Flashcards
1
Q
Radial and Axial flow
A
Marine impeller → axial flow
Flat Blade → radial flow
2
Q
Effect of baffles in an agitated culture.
A
Baffles inhibit vortex formation
3
Q
Effects of agitation on gas flow pattern
A
Low rates: Gas Controlled Flow Pattern and bubble flow unaffected by agitation
High rates Increase bubble breakup and holdup
4
Q
How does agitation promote O2 transfer
A
By dispersing air in the culture
By delaying escape of air bubbles
By preventing bubble coalescence
By decreasing the thickness of the liquid film
5
Q
Dimensionless number that determines Mixer Power
4 numbers
A
Reynolds Number
Power Number
Nf (Froude Number)
Na (Aeration Number)
Forude for vortex, Aeration when aerated
