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It is shown that bulk thermodynamic effects, in addition to surface tension effects, can play a crucial role in thermocapillary phenomena (e.g., bubble or droplet thermomigration and phase separation in multi-phase systems subjected to an imposed temperature gradient) due to asymmetric thermodynamic properties of the underlying coexisting phases. The resultant new phenomena are elucidated in a representative model of diffusive systems with a conserved order parameter.
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Bhagavatula et al. (1996) studied this question.
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