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Poster De Conférence Année : 2019

Cooperative breakups induced by drop-to-drop interactions in one dimensional flows of drops against micro obstacles

Louis Salkin
  • Fonction : Auteur
  • PersonId : 944722
Alexandre Schmit
  • Fonction : Auteur
  • PersonId : 983099
Laurent Courbin
Pascal Panizza

Résumé

The fragmentation of drops into smaller ones, when impacting a surface, is a phenomenon which occurs in Nature as well as in Industry. Examples include splashes of drops, essential for pesticide deposition, spray painting or ink-jet printing, as well as geometrically mediated drop breakup phenomena occurring in microfluidic devices. When addressing this topic, two key issues are to understand the necessary conditions to observe fragmentation and to predict the final droplet size distribution resulting from this process. Although,the breakup of single drops has drawn much attention for over a century, the parallel problem of the fragmentation of several drops in a sequence, yet essential for various applications, has become a topic of investigation only recently. Here, we study the fragmentation of a train of monodisperse drops flowing through a narrow conduct where a post is placed and against which the successive drops may break up into two daughter droplets or not. By changing the distance separating two consecutive drops, this system offers a unique opportunity to probe the influence of hydrodynamic interactions between successive drops at the scale of an individual fragmentation event. The complexity herein lies in the fact that the possible presence of fluid/fluid interfaces in the two channels on both sides of the obstacle alters the hydrodynamic resistance of these channels. This creates time-delayed feedback effects, whereby the breakups of preceding droplets influence the behavior of the subsequent droplets reaching the obstacle. We show that such effects may lead to sequences of breakup events in which the size of the daughter drops created upon breaking mother ones becomes a periodic function of time. We demonstrate the existence of numerous bifurcations between periodic breakup regimes and we establish diagrams mapping the possible breakup dynamics as a function of the governing physical parameters.
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Dates et versions

hal-02330427 , version 1 (24-10-2019)

Identifiants

  • HAL Id : hal-02330427 , version 1

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Louis Salkin, Alexandre Schmit, Laurent Courbin, Pascal Panizza. Cooperative breakups induced by drop-to-drop interactions in one dimensional flows of drops against micro obstacles. Annual European Rheology Conference, Apr 2019, Portoroz, Slovenia. ⟨hal-02330427⟩
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