Non-isothermal bubble rise dynamics in a self-rewetting fluid

ORAL

Abstract

The motion of a gas bubble in a square channel with linearly-increasing temperature in the vertical direction is investigated via three-dimensional numerical simulations. The channel contains a so-called “self-rewetting” fluid whose surface tension exhibits a parabolic dependence on temperature with a well-defined minimum. An open-source finite-volume fluid flow solver (Basilisk) is used with a dynamic adaptive grid refinement technique. We find that in contrast to `ordinary' fluids with linear dependence of surface tension on temperature, the buoyancy-induced upward motion of the bubble may be enhanced or retarded by a thermocapillary-driven flow depending on the location of the bubble with respect to the position where the surface tension becomes minimum. These phenomena are observed at sufficiently small Bond numbers.

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Authors

  • MANOJ TRIPATHI

    • Indian Institute of Science Education and Research Bhopal
    • Indian Institute of Science Education and Research Bhopal, India

  • Premlata Amarnath Ram

    • Indian Institute of Technology Hyderabad, india
    • Indian Institute of Technology Hyderabad, India
    • Indian Institute of Technology Hyderabad

  • George Karapetsas

    • University of Patras
    • Department of Chemical Engineering, University of Patras, Greece
    • Dept. of Mechanical Engineering, University of Thessaly, Volos 38334, Greece
    • School of Chemical Engineering, Aristotle University of Thessaloniki

  • KIRTI SAHU

    • Indian Institute of Tech Hyderabad
    • Indian Institute of Technology Hyderabad, india
    • Indian Institute of Technology Hyderabad, India

  • Omar Matar

    • Imperial College London
    • Imperial College
    • Department of Chemical Engineering, Imperial College London