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For an ideal plug flow, Reynolds number should be ____________

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For an ideal plug flow, Reynolds number should be ____________

(a) Low

(b) Variably low

(c) High

(d) Not very high

The question was asked in an online interview.

My question is taken from Sterilisation topic in portion Reactor Engineering of Bioprocess Engineering

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The correct answer is (c) High

To elaborate: Plug flow is approached in pipes at turbulent Reynolds numbers above about 2 × 10^4; operation at high Reynolds numbers minimises fluid mixing and velocity variation.

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