72th Annual Meeting of the APS Division of Fluid Dynamics (November 23, 2019 — November 26, 2019)

V0065: Splash evolution of a wedge-patterned disk upon water entry

Authors
  • Hyun Jee Kim, Korea Advanced Institute of Science and Technology (KAIST)
  • Taehyun Kim, Korea Advanced Institute of Science and Technology (KAIST)
  • Daegyoum Kim, Korea Advanced Institute of Science and Technology (KAIST)
DOI: https://doi.org/10.1103/APS.DFD.2019.GFM.V0065

Splash is a common fluid behavior accompanied by the water entry of a solid object. When a disk impacts the free surface, dome-shaped splash is formed around the disk. In this video, we show that, by surface-patterning wedges on the bottom of the disk, novel flower-like splash is formed. The N-wedged disk exhibits flower-like splash with 2N petals. Two splashes are ejected from each side of the wedges, and 2(N-1) splashes are explosively generated between the wedges at the moment of full-submersion of the wedges. Shortly before the wedges fully penetrate into the water, the remaining air between the wedges abruptly escapes and breaks the tip of the splash into droplets. We visualized the evolution of flower-like splash by changing the number of wedges.

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