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See detailWalking droplets above cavities
Filoux, Boris ULiege

Doctoral thesis (2017)

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See detailWalking droplets in linear channels
Filoux, Boris ULiege; Hubert, Maxime ULiege; Schlagheck, Peter ULiege et al

in Physical Review Fluids (2017), 2

When a droplet is placed onto a vertically vibrated bath, it can bounce without coalescing. Upon an increase of the forcing acceleration, the droplet is propelled by the wave it generates and becomes a ... [more ▼]

When a droplet is placed onto a vertically vibrated bath, it can bounce without coalescing. Upon an increase of the forcing acceleration, the droplet is propelled by the wave it generates and becomes a walker with a well-defined speed. We investigate the confinement of a walker in different rectangular cavities, used as waveguides for the Faraday waves emitted by successive droplet bounces. By studying the walker velocities, we discover that one-dimensional confinement is optimal for narrow channels of width of D≃1.5λF. Thereby, the walker follows a quasilinear path. We also propose an analogy with waveguide models based on the observation of the Faraday instability within the channels. [less ▲]

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See detailWalking droplets in confined geometries
Filoux, Boris ULiege; Hubert, Maxime ULiege; Schlagheck, Peter ULiege et al

Poster (2016, October 12)

When gently placing a droplet onto a vertically vibrated bath, under specific conditions, coalescence may be avoided. The drop bounces permanently. Upon increasing the forcing acceleration, the drop ... [more ▼]

When gently placing a droplet onto a vertically vibrated bath, under specific conditions, coalescence may be avoided. The drop bounces permanently. Upon increasing the forcing acceleration, the drop interacts with the wave it generates, and becomes a walker [1,2]. Recently, some 2D confining systems for walking droplets have been developed: cylindrical cavity, harmonic potential or the use of Coriolis force [3,4]. In addition, the interactions between two identical walkers have been studied in a 2D case [5]. Nevertheless, no study focuses on 1D dynamics and their properties. In this work, we show it is possible to confine a walker in a quasi mono-dimensional geometry by using a submerged annular cavity. We focus on the interactions between droplets, and show the interdistance quantization. Then, we study the speed of pairs of walkers and show that the distance between the drops affects the group speed: the closer the drops are, the faster they move. We also propose a numerical model to characterize the distance quantization, and the evolution of the speed of a string of droplets. Finally, we investigate the case of a string of droplets. We discuss the influence of the number of droplets and the distance between droplets on the string speed. 1. Y. Couder, S. Protière, E. Fort, and A. Boudaoud, Nature 437, 208 (2005).
 2. S. Protière, A. Boudaoud, and Y. Couder, J. Fluid Mech. 554, 85 (2006).
 3. S. Perrard, M. Labousse, M. Miskin, E. Fort, and Y. Couder, Nat. Commun. 5, 3219 (2014).
 4. M. Labousse and S. Perrard, Phys. Rev. E 90, 022913 (2014).
 5. C. Borghesi, J. Moukhtar, M. Labousse, A. Eddi, E. Fort, and Y. Couder, Phys. Rev. E 90, 063017 (2014). [less ▲]

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See detailWaveguides for walking droplets
Filoux, Boris ULiege; Hubert, Maxime ULiege; Schlagheck, Peter ULiege et al

E-print/Working paper (2016)

When gently placing a droplet onto a vertically vibrated bath, a drop can bounce without coalescing. Upon increasing the forcing acceleration, the droplet is propelled by the wave it generates and becomes ... [more ▼]

When gently placing a droplet onto a vertically vibrated bath, a drop can bounce without coalescing. Upon increasing the forcing acceleration, the droplet is propelled by the wave it generates and becomes a walker with a well defined speed. We investigate the confinement of a walker in different rectangular cavities, used as waveguides for the Faraday waves emitted by successive droplet bounces. By studying the walker velocities, we discover that 1d confinement is optimal for narrow channels of width of D≃1.5λF. We also propose an analogy with waveguide models based on the observation of the Faraday instability within the channels. [less ▲]

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See detailFollow the guide
Filoux, Boris ULiege; Hubert, Maxime ULiege; Vandewalle, Nicolas ULiege

Poster (2015, May 13)

When gently placing a droplet onto a vertically vibrated bath, under specific conditions, coalescence may be avoided. The drop bounces permanently. Upon increasing the forcing acceleration, the drop ... [more ▼]

When gently placing a droplet onto a vertically vibrated bath, under specific conditions, coalescence may be avoided. The drop bounces permanently. Upon increasing the forcing acceleration, the drop interacts with the wave it generates, and becomes a walker [1,2]. Recently, some 2D confining systems for walking droplets have been developed: cylindrical cavity, harmonic potential or the use of Coriolis force [3,4]. In addition, the interactions between two identical walkers have been studied in a 2D case [5]. Nevertheless, no study focuses on 1D dynamics and their properties. In this work, we show it is possible to confine a walker in a quasi mono-dimensional geometry by using a submerged annular cavity. We focus on the interactions between droplets, and show the interdistance quantization. Then, we study the speed of pairs of walkers and show that the distance between the drops affects the group speed: the closer the drops are, the faster they move. We also propose a numerical model to characterize the distance quantization, and the evolution of the speed of a string of droplets. Finally, we investigate the case of a string of droplets. We discuss the influence of the number of droplets and the distance between droplets on the string speed. 1. Y. Couder, S. Protière, E. Fort, and A. Boudaoud, Nature 437, 208 (2005).
 2. S. Protière, A. Boudaoud, and Y. Couder, J. Fluid Mech. 554, 85 (2006).
 3. S. Perrard, M. Labousse, M. Miskin, E. Fort, and Y. Couder, Nat. Commun. 5, 3219 (2014).
 4. M. Labousse and S. Perrard, Phys. Rev. E 90, 022913 (2014).
 5. C. Borghesi, J. Moukhtar, M. Labousse, A. Eddi, E. Fort, and Y. Couder, Phys. Rev. E 90, 063017 (2014). [less ▲]

Detailed reference viewed: 18 (5 ULiège)
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See detailUn anneau pour les gouverner tous
Filoux, Boris ULiege; Hubert, Maxime ULiege; Vandewalle, Nicolas ULiege

Poster (2015, March)

Lorsqu'on dépose délicatement une goutte sur un bain vibré verticalement, on parvient à éviter le phénomène de coalescence. La goutte rebondit alors de façon permanente. En augmentant l’accélération de ... [more ▼]

Lorsqu'on dépose délicatement une goutte sur un bain vibré verticalement, on parvient à éviter le phénomène de coalescence. La goutte rebondit alors de façon permanente. En augmentant l’accélération de forçage, la goutte interagit avec son propre champ d’ondes. On obtient ainsi un marcheur, avec une vitesse bien définie. Ces dernières années ont vu l’apparition de techniques de confinement de gouttes dans une géométrie bidimensionnelle. D’autre part, les interactions entre deux marcheurs identiques ont également été caractérisées. Au cours de notre exposé, nous verrons qu’il est possible de confiner un marcheur dans une géométrie quasi 1D, en utilisant une cavité annulaire. Nous nous intéresserons aux interactions entre plusieurs gouttes, et montrerons la quantification des distances. Enfin, nous étudierons la vitesse d’une chaîne de gouttes. Nous discuterons de l’influence du nombre de gouttes, mais également de la distance entre ces dernières sur la vitesse d’une chaîne. Nous proposerons un modèle rendant compte de la quantification des distances et de l’évolution des vitesses selon les différents paramètres. Enfin, nous confronterons notre modèle théorique avec nos résultats expérimentaux. [less ▲]

Detailed reference viewed: 38 (5 ULiège)