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  • 1
    Electronic Resource
    Electronic Resource
    Thermal excitation of waves on quantized vortices (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 498-504 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We consider the problem of the thermal excitation of vortex waves on quantized vortex lines and rings. We discover that this problem, which has been largely neglected in the past, apparently presents a "free energy catastrophe'' above about 1.85 K; that is, if one naively proceeds to compute the thermally induced vortex waves on rings or lines, the entropy of the waves becomes so large that the free energy of vortices is driven negative, and superfluidity could not exist. Various mechanisms for eliminating this problem are considered; it appears to be necessary to consider the relevant system to be the vortex plus the bath in order to avoid double counting of states. We comment on the relevance of this calculation to the problem of thermally induced nucleation of vortices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865113
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Equation for Self-Consistent Superfluid Vortex Line Dynamics (2000)
    Springer
    Journal of low temperature physics 120 (2000), S. 269-280 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Turbulence in helium II takes the form of a disordered tangle of quantised vortex line. The existing equation of vortex dynamics used by Schwarz and others to model the evolution of the vortex tangle does not distinguish between the large scale normal fluid velocity and the local variation of the normal fluid velocity introduced by the presence of quantised vortex lines. We derive a new vortex dynamics equation which allows the local normal fluid velocity to be determined by a modified Navier–Stokes equation. Together, the two equations form a self-consistent model to determine the coupled evolution of the normal fluid and quantised vortices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004641912850
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Friction on quantized vortices in helium II. A review (1983)
    Springer
    Journal of low temperature physics 52 (1983), S. 189-247 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an analysis of recent data on friction and drag on quantized vortices in helium II. From these data, we deduce values of the phenomenological and microscopic coefficients of friction on vortex lines and rings over a wide range of temperatures at the saturated vapor pressure. We demonstrate that the microscopic parameters are unusually sensitive to the input data. We include brief discussions of the vortex core parameter, and present the results of precision fits of a number of thermodynamic and transport properties of He II which are used in mutual friction calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682247
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cubic spline fits to thermodynamic and transport parameters of liquid 4He above the λ transition (1981)
    Springer
    Journal of low temperature physics 44 (1981), S. 491-504 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: A survey has been made of the more recent experimental measurements of the viscosity, density, thermal expansion coefficient, thermal conductivity, and specific heat of liquid 4He from the λ region up to 4.2 K. Cubic spline fits to these data are provided using a mean squares approach. The fits are used to plot the temperature dependence of the kinematic viscosity, the thermal diffusivity, and the Prandtl number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117840
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Cubic spline fit to the 19584He scale of temperatures (1983)
    Springer
    Journal of low temperature physics 51 (1983), S. 319-327 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a fit to the T58 scale of temperatures using a cubic spline representation of the vapor pressure as a function of temperature. A discussion of the use and accuracy of the fit is included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683559
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Reply to Edward's comment (1984)
    Springer
    Journal of low temperature physics 55 (1984), S. 191-192 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683660
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    Paper (German National Licenses)
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