Thermal diffusion and convective stability. Experimental study of the carbon tetrachloride + chlorobenzene system
- 1 January 1975
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 71, 42-51
- https://doi.org/10.1039/f19757100042
Abstract
The thermal diffusion behaviour of carbon tetrachloride + chlorobenzene mixtures has been studied (at a mean temperature of 25°C) in horizontal liquid films confined between two rigid, thermally conducting, surfaces 0.923 mm apart. The heavier component (CCl4) migrated to the cold wall for all mixtures studied. Soret coefficients, thermal diffusion factors and heats of transport have been calculated from experiments where the upper plate was heated with respect to the lower one and also from experiments where the direction of the thermal gradient was reversed. Provided that the gradient in the second group of experiments was below a critical limit the results from the two sets of experiments were in good agreement. When the lower surface was heated with respect to the upper one, there was a critical limit to the applied temperature interval above which the apparent Soret coefficient decreased. The observed critical limits agree quite well with the predictions of a recent linear stability analysis. The type of convection which sets in above this limit has not hitherto been directly demonstrated because it does not contribute to the total heat flux across the liquid layer.Keywords
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