Adiabatic flow of He II: II Motion of normal fluid component and vortices

Abstract

In order to confirm our thermohydrodynamic description of adiabatic flow of He II with the new-type mutual friction force, NMR technique was applied to obtain the average flow velocity of 3He atoms, v 3, added to the adiabatic flow system. It was found that the observed net mass flow velocity dependence of v 3 shows a close similarity with that of the normal fluid component velocity v n calculated with the new-type mutual friction force. Especially the existence of the characteristic velocity v c2 was confirmed and a good agreement was found in its value. This supports the validity of our thermohydrodynamic description. The results are discussed with the vortex pinning and depinning concepts.