Thermocapillary manipulation of microfluidic droplets: Theory and applications
| hal.structure.identifier | Laboratoire Jean Alexandre Dieudonné [JAD] | |
| dc.contributor.author | GALLAIRE, François | |
| hal.structure.identifier | Laboratoire d'hydrodynamique [LadHyX] | |
| dc.contributor.author | BAROUD, Charles | |
| hal.structure.identifier | Centre de physique moléculaire optique et hertzienne [CPMOH] | |
| dc.contributor.author | DELVILLE, Jean-Pierre | |
| dc.date.created | 2007-09-12 | |
| dc.date.issued | 2008 | |
| dc.identifier.issn | 0392-8764 | |
| dc.description.abstractEn | It was recently demonstrated by our group that a focused laser beam could be used to produce a net force on a moving microfluidic drop. The aim of the paper is to establish a scaling law for this net force by a examining the closely related but simpler situation of a very thin stationary circular drop of fixed shape submitted to a thermocapillary (Marangoni) stress. This leads us to recall the depth-averaged model for a microfluidic pancake-like undeformable drop submitted to a thermocapillary forcing. Our numerical method to solve the associated equations is then introduced and validated. In the case of a localized heating and for an ‘inverse' Marangoni effect (i.e. the surface tension increases with temperature) mimicking the experimental situation of a focused laser beam impinging on a surfactant laden water-oil interface, the flow field is computed and compared to experimental observations. The viscous shear stresses (normal and tangential) and the pressure force are then computed on the interface, yielding a simple expression for the total force acting on the droplet. Further numerical investigations are conducted and enable us to propose a scaling law for the net force combining all pertinent parameters. | |
| dc.language.iso | en | |
| dc.publisher | International Information and Engineering Technology Association | |
| dc.title.en | Thermocapillary manipulation of microfluidic droplets: Theory and applications | |
| dc.type | Article de revue | |
| dc.subject.hal | Physique [physics]/Physique [physics]/Dynamique des Fluides [physics.flu-dyn] | |
| bordeaux.journal | International Journal of Heat and Technology | |
| bordeaux.page | 161-166 | |
| bordeaux.volume | 26 | |
| bordeaux.issue | 1 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00384745 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00384745v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=International%20Journal%20of%20Heat%20and%20Technology&rft.date=2008&rft.volume=26&rft.issue=1&rft.spage=161-166&rft.epage=161-166&rft.eissn=0392-8764&rft.issn=0392-8764&rft.au=GALLAIRE,%20Fran%C3%A7ois&BAROUD,%20Charles&DELVILLE,%20Jean-Pierre&rft.genre=article |
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