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Maximum rate of oxygen transfer occurs when?

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Maximum rate of oxygen transfer occurs when?

(a) CAL = 0

(b) CAL < 0

(c) CAL >= 1

(d) CAL > 1

This question was posed to me in class test.

I would like to ask this question from Oxygen Uptake in Cell Cultures topic in portion Mass Transfer of Bioprocess Engineering

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The correct option is (a) CAL = 0

Easiest explanation: First, let us estimate the maximum cell concentration that can be supported by the fermenter’s oxygen-transfer system. For a given set of operating conditions, the maximum rate of oxygen transfer occurs when the concentration-difference driving force (C*AL – CAL) is highest, i.e. when the concentration of dissolved oxygen CAL is zero.

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