A small team of researchers from Benemérita Universidad and Universidad de las Américas Puebla, in Mexico and Université de Poitiers, in France, has found a “triple Leidenfrost effect” in dissimilar drops in a hot pan. In their paper published in the journal Physical Review Letters, the group describes a type of “bouncing” they observed with different types of drops hovering over a hot surface.
Prior research has shown that the reason drops of water zip around in a hot pan, is because water at the bottom of the drops is vaporized—thus, the drops hover like air-hockey pucks. This phenomenon has come to be known as the Leidenfrost effect. In this new effort, the researchers have found another drop behavior associated with the Leidenfrost effect.
The work involved dropping two types of liquid onto a hot surface and then tilting the surface to force the drops to run into each other. They wanted to know if the two drops would merge. Instead they found that sometimes one of the drops would start bouncing off of the other.
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