Fluid Mechanics
Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.

∂/∂t = constant
∂/∂s = constant
∂/∂s = 0
∂/∂t = 0

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Fluid Mechanics
Turbine impeller

Produces only radial current
Produces only tangential current
Is effective over wide range of viscosities
Does not produce tangential current

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