Fluid Mechanics
The hydrodynamic and thermal boundary layers will merge, when

Nusselt number tends to infinity
Prandtl number is one
Schmidt number tends to infinity
Archimedes number is greater than 10000

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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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