Transport properties in molecular Knudsen gases can be influenced by an external magnetic field. The dependence of such effects upon field orientation directly reflects the shape of the underlying angular momentum polarizations. A relation between the orientational dependence of the saturated field effect and the polarization is established.

Orientational dependence of magnetic field effects in a molecular Knudsen gas

The cross effect between heat and particle flux in a molecular Knudsen gas is investigated by observing a magnetic field induced pressure difference perpendicular to an applied temperature difference. Data are given for N2, HD and CH4. The effect results from molecular angular momentum polarization produced in molecule-surface interaction. The theory for these phenomena is worked out and compared with the experimental data. Signs and magnitudes of matrix element produces describing the production of polarizations are determined. It is found that polarizations are produced from heat flux and particle flux with roughly the same efficiency.

R. Horne

Papers

Experimental verification of a cross effect between heat and momentum transport in a molecular Knudsen gas