References of "Brandenbourger, Martin"
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See detailInfluences of electric charges on an isolated drop
Brandenbourger, Martin ULiege

Doctoral thesis (2016)

Research such as the famous Millikan experiment or the studies concerning thunderclouds have shown that droplets can be considerably influenced by an excess of electric charges. Indeed, an excess of ... [more ▼]

Research such as the famous Millikan experiment or the studies concerning thunderclouds have shown that droplets can be considerably influenced by an excess of electric charges. Indeed, an excess of charges can affect the intrinsic properties of a droplet, such as its natural oscillation frequency or its internal pressure. Moreover, the electric charges in excess in droplets can also interact with external electric fields. In this thesis, we investigated the influence of electric charges on millimetric droplets that are electrically isolated. In literature, research on isolated charged droplets are mainly focused on droplets with a micrometric size. The lack of studies concerning millimetric charged droplets is explained by the difficulty storing them while avoiding charge leakage. In order to answer to this issue, we examined three storage systems limiting the charge leakage: the microgravity, the vibrating bath method and the Leidenfrost effect. Through these systems, we studied the influence of electric charges on the droplet physical properties, but also the interaction between the charged droplet and its storage system. Furthermore, we investigated the interaction of charged droplets with external electric fields. More precisely, we studied the interaction between two electrically charged droplets and the interaction between one charged droplet and an external homogeneous electric field. A first set of experiments on electrically charged droplets allowed us modeling the charge migration process in liquids and the charge leakage from a millimetric droplet. In particular, we identified and modeled a new mechanism of charges leakage occurring at a time scale of several minutes. Moreover, we confirmed the influence of the electric charges on the droplet surface energy previously deduced from experiments on micrometric droplets. Concerning the three storage systems, the experiments performed in microgravity allowed us describing the influence of the electric interaction on the impact between two charged droplets. The diverse behaviors observed were compared to the cases of impacts between two neutral drops. On a different note, the study of a charged droplet moving on the surface of a vibrating bath because of the influence of an external electric field gave new insights on the interaction between a bouncing droplet and a viscous liquid bath. For example, we observed a ``go-stop" motion during which the droplet horizontally moves when it bounces away and is stopped during its interaction with the liquid bath. We showed that this motion occurs when large droplets are influenced by a weak electric field. Droplets with this kind of motion move with a constant average speed, which makes them easily manoeuvrable. Therefore, the control of the droplet motion led to the development of a new microfluidic prototype. Via this new setup, basic microfluidic tasks can be performed without polluting droplet via contacts with solids or liquids. With these results in mind, we also examined the interaction between two charged droplets bouncing on the vibrating bath. This study brought new insights on the interaction between two charged droplets. Indeed, we observed that two drops with the same charges tend to remain at an equilibrium distance. Our study showed that this equilibrium distance is due to the compensation of the electric repulsion by capillary attraction at the surface of the vibrating bath. Finally, our study of charged droplet in Leidenfrost state on a liquid bath led to a better understanding of the interaction between charged liquid interfaces. Indeed, we showed that electric charges cause the early coalescence of charged droplet because of an increase in the vapor layer drainage. We conclude from our results that an excess of electric charges influences ostensibly the intrinsic behavior of a droplet and its interaction with the environment. Furthermore, each storage system studied brought answers to specific issues. The study of the impact between charged droplets in microgravity outlines new explanations on the behavior of thunderclouds. The results accumulated on the micromanipulation of charged droplet bouncing on a vibrating bath opens the way to a new kind of microfluidic system. Finally, the study on the charged Leidenfrost droplets describes new ways to investigate the influence of electric charges on liquid interfaces. [less ▲]

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See detailDisplacement of an Electrically Charged Drop on a Vibrating Bath
Brandenbourger, Martin ULiege; Vandewalle, Nicolas ULiege; Dorbolo, Stéphane ULiege

in Physical Review Letters (2016), 116

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See detailLeidenfrost drops: effect of gravity
Maquet, Laurent ULiege; Brandenbourger, Martin ULiege; Sobac, Benjamin et al

in Europhysics Letters (2015), 110

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See detailLeidenfrost drops on liquid baths : experiments
Maquet, Laurent ULiege; Darbois-Texier, Baptiste ULiege; Duchesne, Alexis ULiege et al

Conference (2015)

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See detailAbstract: A36.00003 : Interaction between electrically charged droplets in microgravity
Brandenbourger, Martin ULiege; Caps, Hervé ULiege; hardouin, jerome et al

Conference (2015)

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See detailLeidenfrost drops on liquid baths: theory
sobac, benjamin; rednikov, alexey; Maquet, Laurent ULiege et al

Conference (2015)

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See detailUnraveling expressionism
truscott, tadd; Darbois-Texier, Baptiste ULiege; lovett, benjamin et al

Conference (2015)

Detailed reference viewed: 54 (4 ULiège)
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See detailElectrically charged droplet: Case study of a simple generator
Brandenbourger, Martin ULiege; Dorbolo, Stéphane ULiege

in Canadian Journal of Physics (2014), 92

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See detailInfluence of the gravity on the discharge of a silo
Dorbolo, Stéphane ULiege; Maquet, Laurent ULiege; Brandenbourger, Martin ULiege et al

in Granular Matter (2013), 15

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