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| HAL : hal-00724074, version 2 |
| arXiv : 1208.3935 |
| DOI : 10.1140/epjst/e2013-01788-0 |
| Fiche détaillée |  Récupérer au format |
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| European Physical Journal - Special Topics 219 (2013) 131-141 |
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| Versions disponibles : | v1 (17-08-2012) | v2 (20-08-2012) |
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| Droplet actuation induced by coalescence: experimental evidences and phenomenological modeling |
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| Mathieu Sellier 1Volker Nock 2 |
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| (19/03/2013) |
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| This paper considers the interaction between two droplets placed on a substrate in immediate vicinity. We show here that when the two droplets are of different fluids and especially when one of the droplet is highly volatile, a wealth of fascinating phenomena can be observed. In particular, the interaction may result in the actuation of the droplet system, i.e. its displacement over a finite length. In order to control this displacement, we consider droplets confined on a hydrophilic stripe created by plasma-treating a PDMS substrate. This controlled actuation opens up unexplored opportunities in the field of microfluidics. In order to explain the observed actuation phenomenon, we propose a simple phenomenological model based on Newton's second law and a simple balance between the driving force arising from surface energy gradients and the viscous resistive force. This simple model is able to reproduce qualitatively and quantitatively the observed droplet dynamics. |
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| 1 : | Department of Mechanical Engineering |
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University of Canterbury, Christchurch |
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| 2 : | Department of Electrical and Computer Engineering |
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University of Canterbury, Christchurch |
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| 3 : | Ecole Normale Supérieure de Cachan (ENS Cachan) |
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École normale supérieure de Cachan - ENS Cachan |
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| 4 : | Laboratoire Interdisciplinaire de Physique (LIPhy) |
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CNRS : UMR5588 – Université Joseph Fourier - Grenoble I |
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| Domaine | : | Sciences de l'ingénieur/Mécanique/Mécanique des fluides Physique/Mécanique/Mécanique des fluides |
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| droplet – coalescence – actuation – dynamics |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00724074, version 2 | |
| http://hal.archives-ouvertes.fr/hal-00724074 | |
| oai:hal.archives-ouvertes.fr:hal-00724074 | |
| Contributeur : Claude Verdier | |
| Soumis le : Samedi 18 Août 2012, 11:49:28 | |
| Dernière modification le : Mercredi 20 Mars 2013, 08:22:32 | |
