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. $${\left( {1.2} \right)^{\frac{3}{2}}}$$
B. $${\left( {1.2} \right)^{\frac{3}{5}}}$$
C. $${\left( {1.2} \right)^{\frac{2}{3}}}$$
D. $${\left( {1.2} \right)^{\frac{5}{3}}}$$
Answer: Option D
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