Abstract
Abstract Derivation of the mutual friction force between normal fluid and superfluid flows mediated by vortex lines is formulated on the basis of the kinetic theory for quasiparticle gas (phonons and rotons), in the case where two-fluid hydrodynamics is valid. Correspondence with the phenomenological theory is shown unambiguously, with respect to the issue about the Iordanskii force, the origin of the force on the vortex line due to quasiparticles, and the force balance relation between the Magnus force and the force from the normal fluid.
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