We here present a simple fitting-parameter-free theory of the Leidenfrost effect (droplet levitation above superheated plate) covering full range stable shapes, i.e., from small quasispherical droplets to larger puddles floating on pocketlike vapor film. The geometry this film is found be in excellent quantitative agreement with interferometric measurements Burton et al. [Phys. Rev. Lett. 109, 074301 (2012)]. also obtain new scalings generalizing classical ones derived by Biance Fluids 15,...

Low viscosity ($<100\text{ }\text{ }\mathrm{cSt}$) silicon oil droplets are placed on a high (1000 cSt) bath that vibrates vertically. The difference ensures the droplet is more deformed than interface. Droplets bounce periodically when acceleration of its sinusoidal motion larger threshold value. minimum for particular frequency excitation: and motions in resonance. bouncing has been modeled by considering deformation lubrication force exerted air layer between bath. Threshold values...

An antibubble is a spherical air film that immersed in surfactant mixture and drains under the action of hydrostatic pressure. A dynamical model this proposed accounts for surface shear viscosity effects case purely viscous interfaces, which applies surfactants whose adsorption rate much larger than advection at concentration above critical micelle concentration. Our shows lifetime antibubbles increases with viscosity, denoted ε, value measured independently, all agreement experimental...

The crater formation due to the impact of a water droplet onto granular bed has been experimentally investigated. Three parameters were tuned: velocity, size droplet, and grains. aim is determine influence kinetic energy on pattern. shape depends at moment starts bed. spreading recession liquid during carefully analyzed from dynamical point view, using image analysis high-speed video recordings. different observed regimes are characterized by balance between impregnation time capillary...

Droplets bouncing on a vibrated liquid bath open ways to methods of manipulating droplets, creating double emulsion, and performing pilot wave model experiments. In this work, we focus the role droplet deformations in vertical dynamics by neglecting deformation surface bath. To be under favorable condition, low viscous oil droplets are dropped over highly that is vibrated. These bounce vertically exhibit many periodic trajectories resonant modes when tuning forcing parameters, i.e.,...

When an oil droplet is placed on a quiescent bath, it eventually collapses into the bath due to gravity. The resulting coalescence may be eliminated when vertically vibrated. bounces periodically and air layer between replenished at each bounce. This sustained bouncing motion achieved forcing acceleration higher than threshold value. has sufficiently low viscosity, significantly deforms: spherical harmonic Yℓm modes are excited, in resonant effects curve. Indeed, lower needed ℓ with m=0...

This Rapid Communication presents an analytical study of the bouncing a completely inelastic ball on vertically vibrated plate. The interplay saddle-node and period-doubling bifurcations leads to intricate structure bifurcation diagram with uncommon properties, such as infinity cascades in finite range control parameter $\ensuremath{\Gamma}$. A pseudochaotic behavior, consisting arbitrarily long complex periodic sequences, is observed through this generic system.

While the physics of equilibrium systems composed many particles is well known, interplay between small-scale and global properties still a mystery for athermal systems. Non-trivial patterns metastable states are often reached in those We explored various arrangements adopted by magnetic beads along chains rings. Here, we show that it possible to create mechanically stable defects dipole keeping memory frustration. Such defects, nicknamed "ghost junctions", seem act as macroscopic monopoles,...

We report acoustic measurements of popping bubbles during the collapsing aqueous foams. The sound pattern is analyzed using classical methods statistical physics. It found that membrane rupture concerns a wide variety situations: small and large membranes at air/foam interface. Avalanches are put into evidence. Time durations in between successive pops seem to be distributed on universal power law.

When a droplet is gently laid onto the surface of same liquid, it stays at rest for moment before coalescence. The coalescence can be delayed and sometimes inhibited by injecting fresh air under droplet. This happen when bath oscillates vertically. In this case basically bounces on interface. lifetime has been studied with respect to amplitude frequency excitation. decreases acceleration increases. thickness film between investigated using interference fringes obtained system illuminated...

The bouncing of air bubbles about 1 mm in diameter on an air/oil interface is reported. We compare the behavior bubble when at rest or it vibrated. results obtained for allowed extracting key parameter responsible outcome collision, i.e. bounce coalescence (bubble rupture). This deformation bubble. When sufficient (according to oil viscosity and velocity size), bounces because intervening film has a large radius bubble–interface contact time much shorter than needed drainage its critical...

We theoretically investigate the behavior of Leidenfrost drops on a flat substrate submitted to horizontal thermal gradient and highlight that they are able self-propel in preferential direction. Namely, found travel towards colder parts substrate, as if were trying maximize their lifetime. In particular, centimetric water drop can reach velocities order cm/s for gradients few K/mm. general, presented model, based upon lubrication approximation vapor cushion work Sobac et al. [“Leidenfrost...

Antibubbles are unusual fluid objects consisting of a thin spherical air shell surrounding liquid globule. Here we study and analyze the aging these inverted bubbles. The lifetime is found to be distributed along an exponential law. Moreover, breakdown film observed analogue dewetting by spinodal decomposition. We interpret long antibubbles as resulting from slow drainage until reaches critical thickness. Then, van der Waals forces act, leading collapse film.

We report observations of wave turbulence on the surface a ferrofluid submitted to magnetic field parallel fluid surface. The shows several differences compared normal case reported recently. inertial zone regime is notably found be strongly increased with respect case, and well described by our theoretical predictions. dispersion relation linear waves also measured differs from due absence Rosensweig instability.

We study experimentally how the bouncing dynamics of a hollow ball on vibrating plate is modified when it partially filled with liquid or grains. Whereas empty and liquid-filled balls display dominant chaotic dynamics, grains exhibits rich variety stationary states, determined by grain size filling volume. In collisional regime, i.e., energy injected to system mainly dissipated interparticle collisions, an unexpected period-1 orbit appears independently vibration conditions, over wide range....

We present an experimental study of the motion a circular disk spun onto table. With help high speed video system, temporal evolution (i) inclination angle $\ensuremath{\alpha}$, (ii) angular velocity $\ensuremath{\omega}$, and (iii) precession rate $\ensuremath{\Omega}$ are studied. The influence mass as well friction between supporting surface considered. Both observed to decrease according power law. also show that diverges stops. Measurements performed very near collapse on long range...

We have experimentally investigated the interactions between floating magnetic spheres which are submitted to a vertical field, ensuring tunable repulsion, while capillary forces induce attraction. emphasize complex arrangements of bodies. The equilibrium distance particles exhibits hysteresis when applied field is modified. Irreversible processes evidenced. Symmetry breaking also found for three identical bodies strength repulsion tuned. propose Dejarguin-Landau-Verwey-Overbeek (DLVO)--like...

A specific experimental set-up has been installed in a large centrifuge facility order to study different aspects of Leidenfrost drops under high-gravity conditions (5, 10, 15 and 20 times the Earth gravity). In particular, drop lifetime more precisely variations diameter vs. time have shown be good agreement with previous experiments scaling analysis (Biance A.-L. et al., Phys. Fluids, (2003) 1632). Moreover, so-called chimneys are expectedly observed puddles, distance between two depending...