The thermal diffusion factor αT is a particularly useful property for investigating the intermolecular force law because of its enhanced sensitivity to the interaction. Because of this, and because of the lack of experimental data for this property at low temperatures, it was the objective of the present work to measure the composition dependence of αT at several low temperatures and compare the results to several realistic helium intermolecular potentials. An experimental determination of αT is usually made by placing a binary mixture of gases (or isotopes) in a temperature gradient and allowing the slight separation to occur, after which the composition is determined in the hot and cold regions. The process is described by the mass flux equation for a binary mixture in a one-dimensional temperature gradient, which must be in the vertical direction in order to eliminate convection.
Binary Mixture Separation Factor Composition Dependence Equimolar Mixture Copper Disk
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