Knudsen Corrections for Flow Birefringence in Gases
Open Access
- 1 March 1974
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 29 (3) , 365-372
- https://doi.org/10.1515/zna-1974-0301
Abstract
Differential equations and boundary conditions for the flow velocity and the tensor polarization are solved for a cylindrical Couette-flow apparatus in a magnetic field. The ensuing Knudsen corrections for flow birefringence in gases consist of two contributions: (i) the velocity gradient is reduced by slip of the gas at the walls, (ii) the tensor polarization itself is influenced by gas-wall collisions. As a result, flow birefringence decreases for low pressures. For the gases HD, N2 and CO the relevant surface parameters are already known from Knudsen corrections for the Senftleben- Beenakker effect of viscosity. Thus the explicit pressure dependence of flow birefringence can be predicted for these gases (for zero magnetic field) and for the apparatus used by BaasKeywords
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