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Recalcitrant bubbles

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Original languageEnglish
Article number4727
Number of pages9
JournalScientific Reports
Volume4
DOIs
Publication statusPublished - 17 Apr 2014

Abstract

We demonstrate that thermocapillary forces may drive bubbles against liquid flow in 'anomalous' mixtures. Unlike 'ordinary' liquids, in which bubbles migrate towards higher temperatures, we have observed vapour bubbles migrating towards lower temperatures, therefore against the flow. This unusual behaviour may be explained by the temperature dependence of surface tension of these binary mixtures. Bubbles migrating towards their equilibrium position follow an exponential trend. They finally settle in a stationary position just 'downstream' of the minimum in surface tension. The exponential trend for bubbles in 'anomalous' mixtures and the linear trend in pure liquids can be explained by a simple model. For larger bubbles, oscillations were observed. These oscillations can be reasonably explained by including an inertial term in the equation of motion (neglected for smaller bubbles).

    Research areas

  • THERMOCAPILLARY MIGRATION, TEMPERATURE-GRADIENT, POLYGONAL TUBES, SURFACE-TENSION, LONG BUBBLES, MOTION, MINIMUM

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