Viscosity of Helium, Argon, and Nitrogen as a Function of Density
Final rept. 1 Sep 1968-30 Apr 1971
MARYLAND UNIV COLLEGE PARK INST FOR MOLECULAR PHYSICS
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The paper presents the results of new, precise measurements of the viscosity of nitrogen, argon, and helium at 25C. The measurements were performed over a nominal range of pressures 1-100 atm and at very closely spaced density intervals. The data were subjected to a stringent statistical analysis in order to determine whether the density expansion consists of a pure polynomial or whether a term of the form 2ln must be included in it. The existence of such a term was discovered theoretically by several investigators. The analysis indicates that if such a term exists, its factor must be very small. This result is interpreted as indicating that correlations which extend over distances of the order of a mean free path are negligible when compared with correlations which extend over distances of the order of the range of molecular interactions.
- Physical Chemistry
- Fluid Mechanics