Thermomagnetic and viscomagnetic effects in a dilute gas

V. Vesovic1, R. Hellmann2, E. Bich2 and E. Vogel2

1Department of Earth Science and Engineering, Imperial College London, London, UK
2Institute of Chemistry, University of Rostock, Rostock, Germany

Keywords: thermomagnetic, viscomagnetic
property: thermal conductivity, viscosity
material: fluid

The transport properties of a dilute molecular gas can be related to the microscopic processes by means of kinetic theory, as it is a direct consequence of molecular motion and the resulting exchange of energy between colliding molecules. The unifying kinetic theory for the description of many macroscopic phenomena observed in dilute gases can be formulated in terms of generalized cross sections. These cross sections are determined by the dynamics of the binary collisions in the gas and can, in turn, be related to the intermolecular potential energy hypersurface that describes a particular molecular interaction. Hence generalized cross sections contain all the details of the dynamics of binary encounters with appropriate statistical weighting over energy and internal states. It is now possible to calculate the transport properties of simple molecular gases directly from their intermolecular potential [1]. It will be argued that the methodology and hardware for the performance of such calculations is now in place, and that the accuracy of the calculated transport properties is, in general, commensurate with the best available experimental data. It is well known that in the presence of a magnetic field the transport property coefficients lose their isotropic character. It will be shown that the current calculations agree well with the experimental data on thermomagnetic and viscomagnetic coefficients and that they provide a further validation test for the accuracy of the intermolecular potential. Furthermore, it is now possible for the first time to ascertain how dominant are different angular momentum/velocity polarizations. The magnitude and variation of different polarizations will be discussed in terms of generalized cross sections and their interplay.

  1. R. Hellmann, E. Bich, E. Vogel, A.S. Dickinson, V. Vesovic, J. Chem. Phys. 129, 064302 (2008); ibid 130, 124309 (2009); ibid 131, 014303 (2009) and references therein.

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