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  • Fluid Mechanics and Heat Transfer  (1)
  • INORGANIC AND PHYSICAL CHEMISTRY  (1)
  • 1
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    Internal Waves in CVX (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Near the liquid-vapor critical point, density stratification supports internal gravity waves which affect 1-g viscosity measurements in the CVX (Critical Viscosity of Xenon) experiment. Two internal-wave modes were seen in the horizontal viscometer. The frequencies of the two modes had different temperature dependences: with decreasing temperature, the higher frequency increased monotonically from 0.7 to 2.8 Hz, but the lower frequency varied non-monotonically, with a maximum of 1.0 Hz at 20 mK above the critical temperature. The measured frequencies agree with independently calculated frequencies to within 15%.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: Third Microgravity Fluid Physics Conference; 29-34; NASA-CP-3338
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Quantitative characterization of the viscosity of a microemulsion (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The viscosity of the three-component microemulsion water/decane/AOT has been measured as a function of temperature and droplet volume fraction. At temperatures well below the phase-separation temperature the viscosity is described by treating the droplets as hard spheres suspended in decane. Upon approaching the two-phase region from low temperature, there is a large (as much as a factor of four) smooth increase of the viscosity which may be related to the percolation-like transition observed in the electrical conductivity. This increase in viscosity is not completely consistent with either a naive electroviscous model or a simple clustering model. The divergence of the viscosity near the critical point (39 C) is superimposed upon the smooth increase. The magnitude and temperature dependence of the critical divergence are similar to that seen near the critical points of binary liquid mixtures.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Chemical Physics (ISSN 0021-9606); 87; 3687-369
    Format: text
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    NASA TECHNICAL REPORTS
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