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Normal fluid velocity profile and transition from T-1 to T-2 state of superfluid turbulence

Lookup NU author(s): Professor Carlo Barenghi


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It has been known for many years that in a circular counterflow pipe there exist two different states of turbulence of helium II: the T-1 state, which appears at low values of heat flux, and the T-2 state, which appears suddenly at higher heat flux and is characterized by a much higher density of quantized vortex lines. Until now the nature of the two turbulent states has been a mystery. To understand this problem we have addressed the issue of the velocity profile of the normal fluid and its stability. The computed critical heat flux of the transition from the T-1 state to the T-2 state is found to be in good agreement with the observations. The result indicates that in the T-1 state the superfluid is turbulent but the normal fluid is still laminar. The T-1 to T-2 transition corresponds to the onset of normal fluid turbulence.

Publication metadata

Author(s): Melotte DJ, Barenghi CF

Publication type: Article

Publication status: Published

Journal: Journal of Low Temperature Physics

Year: 1998

Volume: 113

Issue: 3-4

Pages: 573-578

Print publication date: 01/01/1998

ISSN (print): 0022-2291

ISSN (electronic): 1573-7357

Publisher: Springer


DOI: 10.1023/A:1022537103562


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