How merging droplets jump off a superhydrophobic surface: Measurements and model

Timothé Mouterde, Thanh Vinh Nguyen, Hidetoshi Takahashi, Christophe Clanet, Isao Shimoyama, David Quéré

研究成果: Article査読

20 被引用数 (Scopus)

抄録

We investigate how drops merging on a nonwettable surface jump off this surface, for both symmetric and asymmetric coalescences. For this purpose, we design and build a microelectromechanical system sensor able to quantify forces down to the micro-Newton scale at a high acquisition rate (200 kHz). Using this device, we perform direct force measurements of self-propelled droplets coupled to high-speed imaging. Experimental data show that the total momentum of the drop after coalescence mainly depends on the size of the smaller drop. Exploiting this finding, we quantitatively predict the takeoff speed of jumping drop pairs and show how to correct the usual argument based on energy conservation.

本文言語English
論文番号114303
ジャーナルPhysical Review Fluids
2
11
DOI
出版ステータスPublished - 2017 11
外部発表はい

ASJC Scopus subject areas

  • Computational Mechanics
  • Modelling and Simulation
  • Fluid Flow and Transfer Processes

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