Christophe Josserand

LadHyX, CNRS & Ecole Polytechnique (Paris)

Freezing droplets

Fluids and Materials Seminar

3rd October 2019, 2:00 pm – 3:00 pm
Fry Building, G.13

When a water drops is put in contact with a very cold substrates, it freezes, exhibiting striking structures such as pointy drops for instance.
I will discuss the coupling between this (slow) solidification dynamics with the (rapid) dynamics of drop impacts. The solidification can be
described using a "simple" 1D diffusion model that accounts for the heat transfer with the ice and the substrate.
The different structures observed experimentally will be characterized using the balance between surface flows and solidification.
The results will reveal the complex wetting properties of the water on ice. Finally I will discuss the formation of a ice rivulet where the
balance between solidification and dynamics is controlled by a confined thermal boundary layer.

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