The occurrence of thermal oscillations in a wedge-shaped Bénard cell containing water-methanol mixtures is described and evidence is presented to suggest that the oscillations arise from an instability in the roll-cell convection produced by the wedge shape. Steady oscillations observed recently in a Benard cell containing water-ethanol mixtures have been attributed to the Soret effect and this suggestion is critically discussed.
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Hurle et al. (1973) studied this question.
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