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

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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, v3, added to the adiabatic flow system. It was found that the observed net mass flow velocity dependence of v3 shows a close similarity with that of the normal fluid component velocity vn calculated with the new-type mutual friction force. Especially the existence of the characteristic velocity vc2 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.

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Present address: Sumitomo Heavy Industries, Ltd., Tanashi-shi, Tokyo 188, Japan.

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