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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) 1:2The 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

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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