[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
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