What Factors Influence Power Requirements and Tip Speed in Bioreactors?

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nuruk1234
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Homework Statement



1. Why does the power requirement for a bioreactor increase when flooding ( when the cavities in the bioreactor hae merge together and beome large) occurs to the bioreactor?
2. Why is tip speed of the agitator related to having the highest shear force in a bioreactor?

Homework Equations


not sure there are any as these are theory questions

The Attempt at a Solution


All i know is that for
1. Shouldn't it have a lower power requirement since the agitators are practically spinning air and air much is less dense than liquid.
2. Really have no clue.[/B]
 
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Discussion

ok thank you nidum, but how do the equations help to answer quest 1 or 2?