75th Annual Meeting of the APS Division of Fluid Dynamics (November 20, 2022 — November 22, 2022)

V0063: Escape of deformable bubble through a miscible liquid-liquid interface

  • Kyuseong Choi, Seoul National University
  • Hyungmin Park, Seoul National University, Institute of Advanced Machines and Design
DOI: https://doi.org/10.1103/APS.DFD.2022.GFM.V0063

In this video, we show instabilities generated by a deformable bubble (rising velocity = 0.2 - 0.3 m/s) passing through miscible liquids. We used tap water and water-glycerine mixture in upper and lower liquid repectively, and dyed the lower liquid to observe phenomena clearly.

As the volume of the bubble and viscosity of the lower liquid changed, many instabilities such as path instability, Kelvin-Helmholtz instability, and azimuthal instability appeared and disappeared. Also, we observed how Kelvin-Helmholtz instability developed on the interface of the miscible liquid column and when symmetry or asymmetry occurred according to the volume and viscosity.

This work is licensed under the Creative Commons Attribution-NonCommercial 4.0 International License. Any reuse must credit the author(s) and provide a link back to this page.