The viscosity of pure nitrogen and of three (nitrogen + carbon dioxide) mixtures was measured over the temperature range from (253.15 to 473.15) K with pressures up to 2 MPa utilizing a rotating-body viscometer. The relative combined expanded uncertainty (k = 2) of viscosity was estimated to be between (0.14 and 0.19) % for nitrogen. For the binary mixtures, the uncertainty ranged between (0.19 and 0.39) %. The new data for nitrogen show very good agreement with experimental data from the literature and with recent ab initio calculations. The experimental data for the binary mixtures were compared with an Extended Corresponding States (ECS) model as implemented in the NIST REFPROP 9.1 database. The relative deviations of the data from the model were generally found to increase in magnitude with increasing density and ranged between (−2.1 and 0.4) % near the greatest density studied. The experimental data were correlated using
Viscosity
measurements of pure krypton were carried out in the
temperature range from (253.15 to 473.15) K at pressures up to 2 MPa
utilizing a rotating-body viscometer. Herewith, the viscosity is determined
relative to helium on the basis of the decay rate of a slender cylindrical
body, which is vertically levitated by a magnetic-suspension coupling
that rotates inside a pressure-tight measuring cell. In contrast to
our previous studies, the residual damping value was determined experimentally
within the scope of this work. The obtained values for the residual
damping were validated by a comparison of two re-evaluated data sets
for argon and neon with highly accurate experimental and ab initio
calculated literature values for the viscosity in the limit of zero
density. The relative combined expanded uncertainty (k = 2) of the viscosity measurements of krypton was estimated to be
between (0.17 and 0.28)%. For the purpose of data comparison, a simple
viscosity correlation was fitted to the measured data due to a missing
correlation function. The new experimental data are in very good agreement
with other experimental data from literature at low densities. Furthermore,
the new data show relative deviations <0.2% from recent ab initio
calculations in the limit of zero density.
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