References of "Gilet, Tristan"
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See detailCharacterization of EMT-shifted coagulant CTC
Genna, Anthony ULiege; Van Loo, Stéphanie ULiege; Vanwynsberghe, Aline ULiege et al

Poster (2019, February 01)

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See detailCharacterization of EMT-shifted coagulant CTC
Genna, Anthony ULiege; Van Loo, Stéphanie ULiege; Vanwynsberghe, Aline ULiege et al

Poster (2019, January 28)

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See detailAdhesive elastocapillary force on a cantilever beam
Gilet, Tristan ULiege; Gernay, Sophie-Marie ULiege; Aquilante, Lorenzo et al

in Soft Matter (2019), 15

This paper reports an experimental and theoretical investigation of a cantilever beam in contact with an underlying substrate, in the presence of an intervening liquid bridge. The beam is deflected in ... [more ▼]

This paper reports an experimental and theoretical investigation of a cantilever beam in contact with an underlying substrate, in the presence of an intervening liquid bridge. The beam is deflected in response to the adhesive capillary forces generated by the liquid. Three main regimes of contact are observed, similarly to other elastocapillary systems already reported in the literature. We measured both the position of the liquid meniscus and the force at the beam clamp in the direction normal to the substrate, as functions of the distance between the beam clamp and the substrate. The resulting force–displacement curve is not monotonic and it exhibits hysteresis in the second regime that we could attribute to solid–solid friction at the beam tip. In the third regime, the adhesive force measured at the clamp strongly increases as the beam approaches the substrate. A 2-dimensional beam model is proposed to rationalize these measurements. This model involves several non-linearities due to geometrical constraints, and its solution with a minimum of iterations is not trivial. The model correctly reproduces the force–displacement curve under two conditions: friction is considered in the second regime, and the reaction force applied by the substrate on the beam is distributed in the third regime. These results are discussed in the context of the adhesion of setal tips involved in the terrestrial locomotion of beetles. [less ▲]

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See detailEdge effect: Liquid sheet and droplets formed by drop impact close to an edge
Lejeune, Sophie ULiege; Gilet, Tristan ULiege; Bourouiba, Lydia

in Physical Review Fluids (2018), 3

Asymmetric liquid sheet fragmentation is ubiquitous in nature and potentially shapes critical phenomena such as rain-induced propagation of foliar diseases. In this experimental study, we investigate the ... [more ▼]

Asymmetric liquid sheet fragmentation is ubiquitous in nature and potentially shapes critical phenomena such as rain-induced propagation of foliar diseases. In this experimental study, we investigate the formation and fragmentation of a liquid sheet upon impact of a drop close to the edge of a solid substrate. Both the impact Weber number and the offset, the distance from the impact point to the edge, are systematically varied. Their influence on the kinematics of the liquid sheet and the subsequent statistics of droplet ejection are rationalized. Three major asymmetry scenarios are identified and linked to distinct droplet ejection patterns. Scaling laws are proposed to rationalize these scenarios based on impact parameters. [less ▲]

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See detailRaindrop impact and fragmentation at the edge of leafs, in the context of foliar disease transmission
Lejeune, Sophie ULiege; Bourouiba, Lydia; Gilet, Tristan ULiege

Conference (2018, August)

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See detailCombine Dimensional Analysis with Educated Guessing
Gommes, Cédric ULiege; Gilet, Tristan ULiege

in Chemical Engineering Progress (2018), 114(2), 49

Use dimensional analysis and educated guessing to simplify experimentation and simulation, gain physical insight from empirical relationships, and extrapolate data.

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See detailIntroduction to focus issue on hydrodynamic quantum analogs
Bush, John W.M.; Couder, Yves; Milewski, Paul A. et al

in Chaos (2018)

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See detailInteraction of two walkers: Perturbed vertical dynamics as a source of chaos
Tadrist, Loïc ULiege; Sampara, Naresh; Schlagheck, Peter ULiege et al

in Chaos (2018)

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See detailLiquid secretion and setal compliance: the beetle's winning combination for a robust and reversible adhesion
Gilet, Tristan ULiege; Heepe, Lars; Lambert, Pierre et al

in Current Opinion in Insect Science (2018), 30

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See detailFaraday instability and subthreshold Faraday waves: surface waves emitted by walkers
Tadrist, Loïc ULiege; Shim, Jeong -Bo ULiege; Gilet, Tristan ULiege et al

in Journal of Fluid Mechanics (2018), 848

A walker is a fluid entity comprising a bouncing droplet coupled to the waves that it generates at the surface of a vibrated bath. Thanks to this coupling, walkers exhibit a series of wave–particle ... [more ▼]

A walker is a fluid entity comprising a bouncing droplet coupled to the waves that it generates at the surface of a vibrated bath. Thanks to this coupling, walkers exhibit a series of wave–particle features formerly thought to be exclusive to the quantum realm. In this paper, we derive a model of the Faraday surface waves generated by an impact upon a vertically vibrated liquid surface. We then particularise this theoretical framework to the case of forcing slightly below the Faraday instability threshold. Among others, this theory yields a rationale for the cosine dependence of the wave amplitude to the phase shift between impact and forcing, as well as the characteristic time scale and length scale of viscous damping. The theory is validated with experiments of bead impact on a vibrated bath. We finally discuss implications of these results for the analogy between walkers and quantum particles. [less ▲]

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See detailEdge-effect fragmentation in the context of foliar disease transmission
Lejeune, Sophie ULiege; Gilet, Tristan ULiege; Bourouiba, Lydia

Conference (2017, November)

Rain-induced foliar pathogen propagation is inherently linked to raindrop fragmentation upon impact on infected leaves. Close to leaf edges, the outcome of a drop impact is complex and asymmet- ric ... [more ▼]

Rain-induced foliar pathogen propagation is inherently linked to raindrop fragmentation upon impact on infected leaves. Close to leaf edges, the outcome of a drop impact is complex and asymmet- ric. Despite the ubiquitous nature of impacts close to edges, little is known on the role of edges in shaping drop fragmentation (edge-effect fragmentation). To address this gap, we present a series of drop impact experimental results with impact point close to the surface edge. We focus on the liquid sheet expansion in the air and the role of the edge in introducing the asymmetry in such expansion. We link the edge-induced asymmetry of the sheet to the emergence of different families of droplet- producing fragmentation processes. We discuss how our results can help shed light on foliar disease transmission. [less ▲]

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See detailMulti-scale tarsal adhesion kinematics of freely-walking dock beetles
Gernay, Sophie-Marie ULiege; Labousse, S.; Lambert, Pierre et al

in Journal of the Royal Society, Interface (2017), 14(136),

In this experimental study, living dock beetles are observed during their free upside-down walk on a smooth horizontal substrate. Their weight is balanced by the adhesion of hairy structures present on ... [more ▼]

In this experimental study, living dock beetles are observed during their free upside-down walk on a smooth horizontal substrate. Their weight is balanced by the adhesion of hairy structures present on their tarsomeres. The motions involved in the attachment and detachment of these structures were characterized by simultaneously imaging the beetle from the side at the body scale, and from the top at the scale of a single tarsal chain. The observed multi-scale three-dimensional kinematics of the tarsi is qualitatively described, then quantified by image processing and physically modelled. A strong asymmetry is systematically observed between attachment and detachment kinematics, in terms of both timing and directionality. © 2017 The Author(s) Published by the Royal Society. All rights reserved. [less ▲]

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See detailLa physique de la pluie conditionne la propagation des maladies en agriculture
Gilet, Tristan ULiege; Bourouiba, Lydia

Article for general public (2017)

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See detailDroplet formation by squeezing in a microfluidic cross-junction
Van Loo, Stéphanie ULiege; Stoukatch, Serguei ULiege; Kraft, Michael ULiege et al

in Microfluidics and Nanofluidics (2016), 20(10), 1-12

In microfluidics, flow focusing is widely used to produce water-in-oil droplets in microchannels at high frequency. We here report an experimental study of droplet formation in a microfluidic cross ... [more ▼]

In microfluidics, flow focusing is widely used to produce water-in-oil droplets in microchannels at high frequency. We here report an experimental study of droplet formation in a microfluidic cross-junction with a minimum number of geometrical parameters. We mostly focus on the squeezing regime, which is composed of two distinct steps : filling and pinching. The duration of each step (and corresponding volumes of each liquid phase) are analyzed. They vary according to both water and oil flow rates. These variations provide several insights about the fluid flows in both phases. We propose several scaling laws to relate the droplet volume and frequency to the flow rate of both phases. We also discuss the influence of surfactant and channel compliance on droplet formation. [less ▲]

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See detailHow do droplets form?
Van Loo, Stéphanie ULiege; Stoukatch, Serguei ULiege; Kraft, Michael ULiege et al

Poster (2016, September 07)

In microfluidics, flow focusing is widely used to produce water-in-oil droplets in microchannels at high frequency. We here report an experimental study of droplet formation in a microfluidic cross ... [more ▼]

In microfluidics, flow focusing is widely used to produce water-in-oil droplets in microchannels at high frequency. We here report an experimental study of droplet formation in a microfluidic cross-junction with a minimum number of geometrical parameters. We mostly focus on the squeezing regime, which is com- posed of two distinct steps : filling and pinching. The duration of each step (and corresponding volumes of each liquid phase) are analyzed. They vary according to both water and oil flow rates. These variations provide several insights about the fluid flows in both phases. We propose several scaling laws to relate the droplet volume and frequency to the flow rate of both phases. We also discuss the influence of surfactant and channel compliance on droplet formation. [less ▲]

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See detailElastocapillarity in Dock Beetle Adhesion
Gernay, Sophie-Marie ULiege; Federle, Walter; Lambert, Pierre et al

Poster (2016, September)

Miniaturization is currently limited by our ability to manipulate micrometer-sized objects. Insect adhesion is an advantageous bio-inspired solution to this problem, although it is not fully understood ... [more ▼]

Miniaturization is currently limited by our ability to manipulate micrometer-sized objects. Insect adhesion is an advantageous bio-inspired solution to this problem, although it is not fully understood yet. Interference Reflection Microscopy images of the beetle Gastrophysa Viridula adhesive structures in contact with a smooth substrate were analyzed. The results were cross-linked with an analytical model of an elastic beam deflected by a liquid meniscus. By fitting the unknown model parameters to the experimental data, we obtained information about the elastic properties of the structures, the liquid volume in the bridge, and the resulting adhesion levels. [less ▲]

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