To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of_________________?
(A) (1.2)3/2
(B) (1.2)3/5
(C) (1.2)2/3
(D) (1.2)5/3
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