Intrinsic fluctuations of the vortex-line density in superfluid turbulence

1987 ◽  
Vol 35 (7) ◽  
pp. 3149-3161 ◽  
Author(s):  
D. Griswold ◽  
C. P. Lorenson ◽  
J. T. Tough
Keyword(s):  
Vortex Line ◽  
Line Density ◽  
Superfluid Turbulence ◽  
Intrinsic Fluctuations

The vortex line density in nonuniform superfluid turbulence

1994 ◽  
Vol 194-196 ◽  
pp. 717-718 ◽  
Author(s):  
J.F. Kafkalidis ◽  
G. Klinich ◽  
J.T. Tough
Keyword(s):  
Vortex Line ◽  
Line Density ◽  
Superfluid Turbulence

scholarly journals Inhomogeneous vortex tangles in counterflow superfluid turbulence: flow in convergent channels

2016 ◽  
Vol 7 (2) ◽  
pp. 130-149 ◽  
Author(s):  
Lidia Saluto ◽  
Maria Stella Mongioví
Keyword(s):  
Evolution Equation ◽  
Dimensional Analysis ◽  
Unit Volume ◽  
Vortex Formation ◽  
Second Order ◽  
Line Density ◽  
Superfluid Turbulence ◽  
Turbulence Flow ◽  
Vortex Diffusion

Abstract We investigate the evolution equation for the average vortex length per unit volume L of superfluid turbulence in inhomogeneous flows. Inhomogeneities in line density L andincounterflowvelocity V may contribute to vortex diffusion, vortex formation and vortex destruction. We explore two different families of contributions: those arising from asecondorder expansionofthe Vinenequationitself, andthose whichare notrelated to the original Vinen equation but must be stated by adding to it second-order terms obtained from dimensional analysis or other physical arguments.

Evolution of superfluid vortex line density behind a heat (second-sound) pulse in helium II

1989 ◽  
Vol 63 (1) ◽  
pp. 39-42 ◽  
Author(s):  
M. v. Schwerdtner ◽  
G. Stamm ◽  
D. W. Schmidt
Keyword(s):  
Vortex Line ◽  
Sound Pulse ◽  
Second Sound ◽  
Line Density ◽  
Helium Ii

scholarly journals Dynamics of the vortex line density in superfluid counterflow turbulence

2018 ◽  
Vol 97 (1) ◽  
Author(s):  
D. Khomenko ◽  
V. S. L'vov ◽  
A. Pomyalov ◽  
I. Procaccia
Keyword(s):  
Vortex Line ◽  
Line Density

Steady-State Vortex-Line Density in Turbulent He II Counterflow

1978 ◽  
Vol 41 (16) ◽  
pp. 1123-1126 ◽  
Author(s):  
R. M. Ostermeier ◽  
M. W. Cromar ◽  
P. Kittel ◽  
R. J. Donnelly
Keyword(s):  
Steady State ◽  
Vortex Line ◽  
Line Density

scholarly journals Vortex line density of superfluid suction vortex

2021 ◽  
Vol 6 (6) ◽  
Author(s):  
Ken Obara ◽  
Itsuki Matsumura ◽  
Naoya Tajima ◽  
Katsuyoshi Ohyama ◽  
Hideo Yano ◽  
...  
Keyword(s):  
Vortex Line ◽  
Line Density

Mutual friction in a heat current in liquid heliumn. II. IV. Critical heat currents in wide channels

1958 ◽  
Vol 243 (1234) ◽  
pp. 400-413 ◽  
Keyword(s):  
Vortex Line ◽  
Unit Volume ◽  
Critical Value ◽  
Channel Width ◽  
Heat Current ◽  
Mutual Friction ◽  
Superfluid Turbulence ◽  
Wide Channel ◽  
Vortex Lines ◽  
Single Term

Experiments are described in which a heat current in a wide channel is suddenly increased from a small value W 1 to a large value W 2 ; the time characterizing the build-up of the Gorter-Mellink mutual friction to its equilibrium value in the heat current W 2 is studied as a function of W 1 . Interpretation of the results on the basis of the idea that the mutual friction is associated with turbulence (in the form of vortex lines) in the superfluid shows that some mutual friction exists in the heat current W 1 even when the latter is less than the critical value described in parts I and II, and that, as the channel width is increased or the temperature raised, the magnitude of the subcritical mutual friction increases until the critical heat current ceases to exist. It is shown that these observations on mutual friction in small heat currents can be described semi-quantitatively if a single term is added to the expression obtained in part III for the length of vortex line per unit volume in a heat current in a channel of infinite width, and that this term can probably arise either from an annihilation of vortex lines at the walls of the channel or from interference by the walls with the mechanisms of growth and decay of superfluid turbulence discussed in part III. Finally, an explanation is suggested of some of the results described in part II on the decay of mutual friction in the presence of a subcritical heat current.

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