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Agitation and Aeration

Q1: The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that

A a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime

B as the stirrer speed increases, the liquid will continue to circulate and then become turbulent

C as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.

D A vortex will form at low stirrer speeds. As the stirrer speed increases the liquid will start to circulate

ANS:C - as the stirrer speed increases, the liquid will continue to circulate. Eventually a vortex will form.

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