Heat conductivity of polar-nonpolar gas mixtures in an electric field

The change of the heat conductivity due to an electric field parallel to the temperature gradient, Δλ//( E), has been measured with a hot-wire apparatus for the gaseous systems CHF 3-N 2, CH 3F-N 2 and CH 3CN-N 2 at room temperature. The measurements clearly show the existence of two types of contri...

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Bibliographic Details
Published in:Physica 1971-01, Vol.56 (3), p.388-424
Main Authors: De Groot, J.J., Van Den Broeke, J.W., Martinius, H.J., Van Den Meijdenberg, C.J.N., Beenakker, J.J.M.
Format: Article
Language:English
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Summary:The change of the heat conductivity due to an electric field parallel to the temperature gradient, Δλ//( E), has been measured with a hot-wire apparatus for the gaseous systems CHF 3-N 2, CH 3F-N 2 and CH 3CN-N 2 at room temperature. The measurements clearly show the existence of two types of contributions to Δλ//( E), one giving rise to a positive effect, Δλ//( E) > 0, the other to a negative effect, Δλ//( E) < 0. It is found that the positive contribution is strongly connected to the dipole-dipole interactions. The occurrence of the positive contributions proves that the collision operator in the Waldmann-Snider equation is non-self-adjoint for polar gases. Effective collision cross sections have been calculated and are compared with those obtained by other methods.
ISSN:0031-8914
DOI:10.1016/0031-8914(71)90210-2