Fluid Mechanics
For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

Vs/Dp²
Vs²/Dp³
Vs/Dp³
Vs²/Dp²

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Fluid Mechanics
Turbine impeller

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

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