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What is the ratio of tank diameter to impeller diameter for Newtonian fluids?

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What is the ratio of tank diameter to impeller diameter for Newtonian fluids?

(a) 3:1

(b) 2:1

(c) 1:3

(d) 1:2

The question was posed to me in an internship interview.

The origin of the question is Mixing in portion Fluid Flow and Mixing of Bioprocess Engineering

1 Answer

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Best answer
The correct option is (a) 3:1

Best explanation: Mixing is achieved using an impeller mounted in the tank; for use with Newtonian fluids, the ratio of tank diameter to impeller diameter is normally about 3:1. The impeller is usually positioned overhead on a centrally-located stirrer shaft. For efficient mixing with a single impeller, the depth of liquid in the tank should be no more than 1.0-1.25 times the tank diameter.

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