Fluid Mechanics
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

Q/16
Q/4
Q/2
Q/8

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Fluid Mechanics
A stream line is

A line connecting the mid points of flow cross-section
Always the path of particle
Fixed in space in steady flow
Drawn normal to the velocity vector at every point

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Fluid Mechanics
Turbine impeller

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

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