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Dive into the research topics where Alexandre Cohen is active.

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Featured researches published by Alexandre Cohen.


Physics of Fluids | 2014

Two dimensional Leidenfrost droplets in a Hele-Shaw cell

Franck Celestini; Thomas Frisch; Alexandre Cohen; Christophe Raufaste; Laurent Duchemin; Yves Pomeau

We experimentally and theoretically investigate the behavior of Leidenfrost droplets inserted in a Hele-Shaw cell. As a result of the confinement from the two surfaces, the droplet has the shape of a flattened disc and is thermally isolated from the surface by the two evaporating vapor layers. An analysis of the evaporation rate using simple scaling arguments is in agreement with the experimental results. Using the lubrication approximation we numerically determine the shape of the droplets as a function of its radius. We furthermore find that the droplet width tends to zero at its center when the radius reaches a critical value. This prediction is corroborated experimentally by the direct observation of the sudden transition from a flattened disc into an expending torus. Below this critical size, the droplets are also displaying capillary azimuthal oscillating modes reminiscent of a hydrodynamic instability.


Physical Review Letters | 2017

Melde’s Experiment on a Vibrating Liquid Foam Microchannel

Alexandre Cohen; Nathalie Fraysse; Christophe Raufaste

We subject a single Plateau border channel to a transverse harmonic excitation, in an experiment reminiscent of the historical one by Melde on vibrating strings, to study foam stability and wave properties. At low driving amplitudes, the liquid string exhibits regular oscillations. At large ones, a nonlinear regime appears and the acoustic radiation splits the channel into two zones of different cross section area, vibration amplitude, and phase difference with the neighboring soap films. The channel experiences an inertial dilatancy that is accounted for by a new Bernoulli-like relation.


Physical Review Letters | 2014

Inertial Mass Transport and Capillary Hydraulic Jump in a Liquid Foam Microchannel

Alexandre Cohen; Nathalie Fraysse; Jean Rajchenbach; Médéric Argentina; Yann Bouret; Christophe Raufaste


Bulletin of the American Physical Society | 2017

Hydraulic jumps in the liquid foam microchannels

Christophe Raufaste; Alexandre Cohen; Nathalie Fraysse; Jean Rajchenbach; Yann Bouret; Médéric Argentina


Physical Review Fluids | 2016

Solitary-like waves in a liquid foam microchannel

Yann Bouret; Alexandre Cohen; Nathalie Fraysse; Médéric Argentina; Christophe Raufaste


Physical Review E | 2015

Drop coalescence and liquid flow in a single Plateau border.

Alexandre Cohen; Nathalie Fraysse; Christophe Raufaste


Journal of Fluid Mechanics | 2015

One-dimensional capillary jumps

Médéric Argentina; Alexandre Cohen; Yann Bouret; Nathalie Fraysse; Christophe Raufaste


Archive | 2014

Capillary-hydraulic jump in liquid foams

Alexandre Cohen; Nathalie Fraysse; Jean Rajchenbach; Médéric Argentina; Yann Bouret; Christophe Raufaste


eufoam2014 | 2013

CAPILLARY HYDRAULIC JUMP IN A PLATEAU BORDER

Alexandre Cohen; Nathalie Fraysse; Jean Rajchenbach; Médéric Argentina; Yann Bouret; Christophe Raufaste


Réunion annuelle du GdR M&Em (Mousses et Emulsions) | 2013

Bord de Plateau en régime harmonique

Alexandre Cohen; Nathalie Fraysse; Jean Rajchenbach; Christophe Raufaste

Collaboration


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Christophe Raufaste

Centre national de la recherche scientifique

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Nathalie Fraysse

University of Nice Sophia Antipolis

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Jean Rajchenbach

University of Nice Sophia Antipolis

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Médéric Argentina

University of Nice Sophia Antipolis

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Yann Bouret

Centre national de la recherche scientifique

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Thomas Frisch

University of Nice Sophia Antipolis

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Franck Celestini

Centre national de la recherche scientifique

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