Viscosity of nitrogen and certain gaseous mixtures at low temperatures
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 72, 645-653
- https://doi.org/10.1039/f19767200645
Abstract
The viscosity of nitrogen has been measured at temperatures in the range 120–320 K using a capillary flow technique. These results, together with previous data, are used to define a new standard for low-temperature viscosity determinations. In addition, the viscosities of the binary gas mixtures He + Ar, Ar + Kr and CH4+ CF4 have been measured in this temperature range using the same apparatus. Agreement to within 1% is found with the mixture data of previous workers at room temperature, and there is good agreement for the pure component viscosities over the entire temperature range. The mixture viscosities are analysed in terms of the so-called interaction viscosities η12, which are related to unlike pair potential energy functions. The interaction viscosities for He + Ar are combined with previous high-temperature results and are used to obtain a potential energy function in the repulsive region.Keywords
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