73th Annual Meeting of the APS Division of Fluid Dynamics (November 22, 2020 — November 24, 2020)

V0014: Streaming motions created by a dynamic free-slip surface

  • Cong Wang, Caltech
  • Morteza Gharib, Caltech
DOI: https://doi.org/10.1103/APS.DFD.2020.GFM.V0014

Flow motions at the interface of air and water widely exist in nature and engineering applications. In this work, we modulate the dynamic oscillation of a 8-mm circular air-water interface and therefore create a dynamic free-slip surface. The dynamic free surface induces various large-scale coherent motions, such as vortices and streaming jets, depending on the selection of several control parameters. These amazing flow phenomena are shown in this video. In addition to demonstrate the beauty of fluid dynamics, the current discovery can be applied to address many engineer challenges, such as controlling wall turbulence and facilating mass and heat transfer process.

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