Actions for Viscoelasticity of Xenon near the Critical Point

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Viscoelasticity of Xenon near the Critical Point

Author
Moldover, Michael R.
Published
[1999].
Physical Description
1 electronic document
Additional Creators
Berg, Robert F. and Zimmerli, Gregory A.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
Using a novel, overdamped, oscillator flown aboard the Space Shuttle, we measured the viscosity of xenon near the liquid-vapor critical point in the frequency range 2 Hz less than or equal to f less than or equal to 12 Hz. The measured viscosity divergence is characterized by the exponent z(sub eta) = 0.0690 +/- 0.0006, in agreement with the value z(sub eta) = 0.067 +/- 0.002 calculated from a two-loop perturbation expansion. Viscoelastic behavior was evident when t = (T - T(sub c))/T(sub c) less than 10(exp -5) and dominant when t less than 10(exp -6), further from T(sub c) than predicted. Viscoelastic behavior scales as Af(tau) where tau is the fluctuation decay time. The measured value of A is 2.0 +/- 0.3 times the result of a one-loop calculation. (Uncertainties stated are one standard uncertainty.)
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20000005086.
Terms of Use and Reproduction
No Copyright.
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