74th Annual Meeting of the APS Division of Fluid Dynamics (November 21, 2021 — November 23, 2021)

V0020: Bubble Backflipping

  • Alireza Hooshanginejad, Cornell University
  • Anuj Baskota, Cornell University
  • Sunghwan Jung, Cornell University
DOI: https://doi.org/10.1103/APS.DFD.2021.GFM.V0020

We discover that when bubbles of an intermediate size range (i.e. 0.6-0.75 mm in radius) impact a tilted surface, they exhibit a backward flipping motion. This backflipping behavior is strongly dependent on the angle of the tilted surface. At low angles, the second impact falls behind the first impact. At intermediate angles, the bubble goes backward for a period between the first two impacts, but the second impact falls ahead of the first impact. At large angles, the backflipping stops. We show that an asymmetric circulation around the bouncing bubble yields a lift force that is responsible for the backblipping behavior.

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