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Fluid Flow - Medical Science

Q1:

Mixing in stirred tank reactors can

A be described as either laminar, transient or turbulent

B achieve turbulent conditions by increasing the stirrer speed

C induce laminar flow conditions by the addition of baffles

D all of the above

ANS:A - be described as either laminar, transient or turbulent

How can it be possible that flow can be laminar in a stirrer tank?