Starting from the fountain-pressure result that condensed helium atoms move at constant entropy, the author re-derives the two-fluid equations and argues that Osborne's rotating-bucket measurement implies the superfluid has vorticity, contradicting Landau's irrotational principle.
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The Two-Fluid Theory for Superfluid Hydrodynamics and Rotational Motion
Starting from the fountain-pressure result that condensed helium atoms move at constant entropy, the author re-derives the two-fluid equations and argues that Osborne's rotating-bucket measurement implies the superfluid has vorticity, contradicting Landau's irrotational principle.