Viscosity measurements of gaseous H2 between 200 K to 300 K with a spinning rotor gauge

TL;DR

This paper presents the first experimental viscosity measurements of gaseous hydrogen isotopologues between 200 K and 300 K using a novel cryogenic measurement apparatus, filling a gap in existing data and improving understanding of quantum effects.

Contribution

Introduction of Cryo-ViMA, a new apparatus for measuring viscosity of hydrogen isotopologues at cryogenic temperatures, providing experimental data where previously only approximations existed.

Findings

Measured viscosity values of hydrogen isotopologues between 200 K and 300 K.

First experimental data for gaseous tritium viscosity in this temperature range.

Demonstrated effectiveness of Cryo-ViMA for cryogenic viscosity measurements.

Abstract

Experimental values for the viscosity of the radioactive hydrogen isotopologue tritium are still unknown in literature. Existing values from ab initio calculations disregard quantum mechanic effects and are therefore only good approximations for room temperature and above. To fill in these missing experimental values, a measurement setup has been designed, to measure the viscosity of gaseous hydrogen and its isotopologues (H$_2$, HD, HT, D$_2$, DT, T$_2$) at cryogenic temperatures. In this paper, the first results with this Cryogenic Viscosity Measurement Apparatus (Cryo-ViMA) of the viscosity of gaseous hydrogen between 200 K to 300 K are presented.