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What do you mean by “Impeller flooding”?

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What do you mean by “Impeller flooding”?

(a) The flooding of an impeller

(b) Gas handling is greater than the amount introduced

(c) Gas handling is smaller than the amount introduced

(d) Leakage of the Broth

The question was asked in quiz.

My query is from Oxygen Transfer in Fermenters in chapter Mass Transfer of Bioprocess Engineering

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The correct answer is (c) Gas handling is smaller than the amount introduced

The explanation: Impeller flooding is said to occur; this means that the gas-handling capacity of the stirrer is smaller than the amount introduced. Flooding should be avoided because an impeller surrounded by gas no longer contacts the liquid properly, resulting in poor mixing and gas dispersion.

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