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  • viscosity  (8)
  • Springer  (8)
  • American Physical Society
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  • Springer  (8)
  • American Physical Society
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  • 1
    Electronic Resource
    Electronic Resource
    Discrete hydrodynamics: Numerical results for the soft-sphere viscosity (1979)
    Springer
    Journal of statistical physics 20 (1979), S. 641-655 
    Details
    ISSN: 1572-9613
    Keywords: Molecular dynamics ; transport coefficients ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Numerical calculations have been done of the viscosity of the soft-sphere liquid, using a new molecular dynamics technique. It is based on a formulation of hydrodynamics which is discrete in space and time, and exactly renormalizable. The present data turn out to be sufficient to estimate the viscosity, but determination of the full equations of motion (and therefore renormalization) requires further calculations using a smaller discrete time interval; these are presently under way. The present results indicate that this method is more than 100 times more efficient than previous (Green-Kubo or nonequilibrium molecular dynamics) methods. This suggests that the discrete formulation is the most natural way to approach hydrodynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009515
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  • 2
    Electronic Resource
    Electronic Resource
    Tail shortening by discrete hydrodynamics (1982)
    Springer
    Journal of statistical physics 27 (1982), S. 389-405 
    Details
    ISSN: 1572-9613
    Keywords: Molecular dynamics ; transport coefficients ; viscosity ; time correlation functions ; long-time tails
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A discrete formulation of hydrodynamics was recently introduced, whose most important feature is that it is exactly renormalizable. Previous numerical work has found that it provides a more efficient and rapidly convergent method for calculating transport coefficients than the usual Green-Kubo method. The latter's convergence difficulties are due to the well-known “long-time tail” of the time correlation function which must be integrated over time. The purpose of the present paper is to present additional evidence that these difficulties are really absent in the discrete equation of motion approach. The “memory” terms in the equation of motion are calculated accurately, and shown to decay much more rapidly with time than the equilibrium time correlations do.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008945
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  • 3
    Electronic Resource
    Electronic Resource
    Discrete hydrodynamics: Determination of equations of motion by simulation (1979)
    Springer
    Journal of statistical physics 20 (1979), S. 629-639 
    Details
    ISSN: 1572-9613
    Keywords: Molecular dynamics ; transport coefficients ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A detailed procedure is described for computing discrete equations of motion for a fluid, to implement a new method which turns out to be substantially more efficient than previous methods for calculating transport coefficients. This paper describes the calculations of discrete averages from molecular dynamics data and the numerical extraction of the equation-of-motion coefficients in a way which makes maximum use of the geometric symmetry of the problem. Extrapolation to the infinite-system limit and eventual computation of transport coefficients by renormalization are discussed. The method described in detail here is briefly sketched and applied numerically to computing the viscosity of the soft-sphere liquid in a subsequent paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009514
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  • 4
    Electronic Resource
    Electronic Resource
    The viscosity of R32 and R125 at saturation (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 1131-1143 
    Details
    ISSN: 1572-9567
    Keywords: refrigerants ; R32 ; R125 ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports new measurements of the viscosity of R32 and R125, in both the liquid and the vapor phase, over the temperature range 220 to 343 K near the saturation line. The measurements in both liquid and vapor phases have been carried out with a vibrating-wire viscometer calibrated with respect to standard reference values of viscosity. It is estimated that the uncertainty of the present viscosity data is one of 0.5–1%, being limited partly by the accuracy of the available density data. The experimental data have been represented by polynomial functions of temperature for the purposes of interpolation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503677
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  • 5
    Electronic Resource
    Electronic Resource
    The viscosity of liquid R134a (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 33-44 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; refrigerants ; R134a ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper reports new measurements of the viscosity of liquid R134a over the temperature range 235 to 343 K and pressures up to 50 MPa. The measurements have been carried out in a vibrating-wire viscometer calibrated with respect to the viscosity of several liquid hydrocarbons. It is estimated that the uncertainty in the viscosity data reported is ±0.6%. The data therefore have a lower uncertainty than that of earlier measurements of the viscosity of this environmentally acceptable regrigerant. The viscosity data have been represented as a function of density by means of a formulation based upon the rigid, hard-sphere theory of dense fluids with a maximum deviation of ±0.3%. This representation allows the present body of experimental data to be extended to regions of thermodynamic state not covered by the measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00522659
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  • 6
    Electronic Resource
    Electronic Resource
    Viscosity of R134a, R32, And R125 at Saturation (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 365-373 
    Details
    ISSN: 1572-9567
    Keywords: R134a ; R32 ; R125 ; refrigerants ; vibrating-wire viscometer ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports the results of the measurement of the viscosity of R134a close to the saturation line in the vapor phase. The new measurements were carried out in a vibrating-wire viscometer specially constructed for the purpose, and the results have an accuracy of ±2%. In addition, the opportunity is taken to present a reevaluation of earlier measurements along the saturation line of the viscosity of R32 and R125. Improved equations of state for these fluids are now available and can be employed to generate improved values for the viscosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022640617694
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  • 7
    Electronic Resource
    Electronic Resource
    The viscosity of five liquid hydrocarbons at pressures up to 250 MPa (1992)
    Springer
    International journal of thermophysics 13 (1992), S. 773-790 
    Details
    ISSN: 1572-9567
    Keywords: n-decane ; n-hexane ; n-octane ; n-pentane ; toluene ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports new measurements of the viscosity of toluene, n-pentane, n-hexane, n-octane, and n-decane at pressures up to 250 MPa in the temperature range 303 to 348 K. The measurements were performed with a vibrating-wire viscometer and with a relative method of evaluation. Calibration of the instrument was carried out with respect to reference values of the viscosity of the same liquids at their saturation vapour pressure. The viscosity measurements have a precision of ±0.1% but the accuracy is limited by that of the calibration data to be ±0.5%. The experimental data have been represented by polynomial functions of pressure for the purposes of interpolation. The data are also used as the most precise test yet applied to a representation of the viscosity of liquids based upon hard-sphere theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503906
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  • 8
    Electronic Resource
    Electronic Resource
    The viscosity of R32 and R125 at saturation (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 1131-1143 
    Details
    ISSN: 1572-9567
    Keywords: refrigerants ; R32 ; R125 ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports new measurements of the viscosity of R32 and R125, in both the liquid and the vapor phase, over the temperature range 220 to 343 K near the saturation line. The measurements in both liquid and vapor phases have been carried out with a vibrating-wire viscometer calibrated with respect to standard reference values of viscosity. It is estimated that the uncertainty of the present viscosity data is one of 0.5–1%, being limited partly by the accuracy of the available density data. The experimental data have been represented by polynomial functions of temperature for the purposes of interpolation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02431279
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