star shapes
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2021 ◽  
Vol 118 (26) ◽  
pp. e2021691118
Author(s):  
Ambre Bouillant ◽  
Caroline Cohen ◽  
Christophe Clanet ◽  
David Quéré

Volatile liquids (water, alcohol, etc.) poured on hot solids levitate above a layer of vapor. Unexpectedly, these so-called Leidenfrost drops often suddenly start to oscillate with star shapes, a phenomenon first reported about 140 y ago. Similar shapes are known to be triggered when a liquid is subjected to an external periodic forcing, but the unforced Leidenfrost case remains unsolved. We show that the levitating drops are excited by an intrinsic periodic forcing arising from a vibration of the vapor cushion. We discuss the frequency of the vibrations and how they can excite surface standing waves possibly amplified under geometric conditions of resonance—an ensemble of observations that provide a plausible scenario for the origin, mode selection, and sporadic nature of the Leidenfrost stars.


2013 ◽  
Vol 104 (4) ◽  
pp. 521-532 ◽  
Author(s):  
Brigida Rusconi ◽  
Julia Lienard ◽  
Sébastien Aeby ◽  
Antony Croxatto ◽  
Claire Bertelli ◽  
...  
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