Critical parameters for the partial coalescence of a droplet

[en] The partial coalescence of a droplet onto a planar liquid-liquid interface is investigated experimentally by tuning the viscosities of both liquids. The problem mainly depends on four dimensionless parameters: The Bond number (gravity vs surface tension), the Ohnesorge numbers (viscosity in both fluids vs surface tension), and the density relative difference. The ratio between the daughter droplet size and the mother droplet size is investigated as a function of these dimensionless numbers. Global quantities such as the available surface energy of the droplet have been measured during the coalescence. The capillary waves propagation and damping are studied in detail. The relation between these waves and the partial coalescence is discussed. Additional viscous mechanisms are proposed in order to explain the asymmetric role played by both viscosities.

Disciplines :

Physics

Author, co-author :

Gilet, Tristan ; Université de Liège - ULiège > Département de physique > Physique statistique

Mulleners, Karen

Lecomte, Jean-Paul

Vandewalle, Nicolas ; Université de Liège - ULiège > Département de physique > Physique statistique

Dorbolo, Stéphane ; Université de Liège - ULiège > Département de physique > Physique statistique

Language :

English

Title :

Critical parameters for the partial coalescence of a droplet

Alternative titles :

[fr] Paramètres critiques de la coalescence partielle d'une gouttelette

Publication date :

March 2007

Journal title :

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

ISSN :

1539-3755

eISSN :

1550-2376

Publisher :

American Physical Soc, College Pk, United States - Maryland

Volume :

Issue :

3, Pt 2

Pages :

36303

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 30 January 2009

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102

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115

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