Critical exponent for the viscosity of carbon dioxide and xenon

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.459679· OSTI ID:6718888

Berg, R F; Moldover, M R ^[1]

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1. Thermophysics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (USA)

The viscosities {eta} of carbon dioxide and xenon have been measured near their critical points and the critical exponent {ital y} characterizing the asymptotic divergence, {eta}{similar to}{vert bar}{ital T}{minus}{ital T}{sub {ital c}}{vert bar}{sup {minus}{ital y}}, has been determined. Both fluids yielded exponents in the range {ital y}=0.041{plus minus}0.001 and thus also fell in the range {ital y}=0.042{plus minus}0.002 from our earlier study of four binary liquids. This agreement between experiments is the first evidence that pure fluids and binary liquids are in the same dynamic universality class. A recent theoretical value for {ital y} is 0.032. The 30% discrepancy is much greater than the combined errors from experiment and theory. The torsion oscillator viscometer operated at low frequency and low shear rate to avoid systematic errors caused by critical slowing down. Far from {ital T}{sub {ital c}} the analysis accounted for the crossover from critical to noncritical temperature dependence, where the latter was obtained from previously published correlations. Corrections for gravitational stratification were included close to {ital T}{sub {ital c}}.

• OSTI ID: 6718888
• Journal Information: Journal of Chemical Physics; (USA), Vol. 93:3; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON OXIDES
VISCOSITY
PHASE TRANSFORMATIONS
XENON
CRITICAL TEMPERATURE
MEASURING METHODS
ULTRALOW TEMPERATURE
CARBON COMPOUNDS
CHALCOGENIDES
ELEMENTS
FLUIDS
GASES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE GASES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
360603* - Materials- Properties