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Power consumption is less in ungassed fluids.

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in Bioprocess Engineering by (80.7k points)
Power consumption is less in ungassed fluids.

(a) True

(b) False

This question was addressed to me by my school teacher while I was bunking the class.

Asked question is from Power Requirements for Mixing topic in portion Fluid Flow and Mixing of Bioprocess Engineering

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The correct option is (b) False

Easy explanation: Liquids into which gas is sparged have reduced power requirements. Gas bubbles decrease the density of the fluid. The presence of bubbles also affects the hydrodynamic behaviour of fluid around the impeller. Large gas-filled cavities develop behind the stirrer blades in aerated liquids; these cavities reduce the resistance to fluid flow and decrease the drag coefficient of the impeller. With sparging, the power consumed could be reduced to as little as half the ungassed value, depending on gas flow rate.

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