Triple Leidenfrost Effect: Preventing Coalescence of Drops on a Hot Plate

  title={Triple Leidenfrost Effect: Preventing Coalescence of Drops on a Hot Plate},
  author={F. Pacheco-V{\'a}zquez and Ren{\'e} Ledesma-Alonso and J. L. Palacio-Rangel and Florian Moreau},
  journal={Physical Review Letters},
We report on the collision-coalescence dynamics of drops in Leidenfrost state using liquids with different physicochemical properties. Drops of the same liquid deposited on a hot concave surface coalesce practically at contact, but when drops of different liquids collide, they can bounce several times before finally coalescing when the one that evaporates faster reaches a critical size, of the order of the capillary length. The bouncing dynamics is produced because the drops are not only in… 
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