The thermal diffusion factors alpha T of the gas mixtures CH 4 -N 2 and CH 4 -CO 2 have been measured as functions of temperature and composition by using the two-bulb method. The data have been analysed to assess the effects of inelastic collisions on thermal diffusion. The results show that for the system CH 4 -CO 2 , the thermal diffusion factor is significantly influenced by inelastic collisions. For CH 4 -N 2 system no definite conclusion can be drawn regarding the influence of such effects.
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Pal et al. (1974) studied this question.
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