Convection-driven pattern formation in phase-separating binary fluids

CM Pooley*, O Kuksenok, AC Balazs

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Using a thermal-lattice Boltzmann model, we examine the rich phase behavior that develops when partially miscible fluids evolve in the presence of a vertical temperature gradient, which encompasses the critical temperature T-c of the mixture. In particular, a binary AB fluid is confined between two plates in a gravitational field. The upper plate is fixed below T-c and hence, the nearby fluid phase separates into A-rich and B-rich domains. The lower plate is fixed above the temperature T-c, and the surrounding fluid is in the homogeneous phase. A coupling between convection (driven by the temperature gradient) and phase separation gives rise to unique pattern formation. A number of regimes are identified: regularly spaced stripes, convective steady-state columns, the periodic disturbance of these columns, and finally, chaotic dripping from the upper surface. These results highlight dynamical behavior in partially miscible mixtures.

Original languageEnglish
Article number030501
Number of pages4
JournalPhysical Review E - Statistical, Nonlinear and Soft Matter Physics
Volume71
Issue number3
DOIs
Publication statusPublished - Mar 2005

Keywords

  • MIXTURE

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