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