Séminaire PMMH – Stéphane Dorbolo (U. Liège)

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13 février 11:00 » 12:00 — Salle réunion PMMH 1

Droplet in Hostile Territory

A volatile liquid placed near a heat source generates vapor. This vapor forms a thin film that dramatically reduces heat transfer between the surface and the droplet. As a result, the droplet does not boil. This phenomenon, known as the Leidenfrost effect, can be observed when a water droplet is deposited on a hot pan.

We will explore several unusual manifestations of the Leidenfrost effect.
(i) Instead of a solid plate, the hot substrate is replaced by a granular material. Under specific conditions, the droplet begins to dig into the granular bed.
(ii) Returning to a solid surface, we investigate flammable droplets in the Leidenfrost state. The influence of the flame on the droplet’s lifetime is measured and rationalized.

Finally, as an appetizer, we describe the interaction between a droplet and cotton candy, focusing in particular on its interaction with sugar fibers.





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