The bifurcation diagram of drops in a sphere/plane geometry: influence of contact angle hysteresis

Riëlle de Ruiter, M. van Gorcum, C. Semprebon, Michael H.G. Duits, M. Brinkmann, Friedrich Gunther Mugele

Research output: Contribution to conferenceAbstract

Abstract

We study liquid drops that are present in a generic geometry, namely the gap in between a sphere and a plane. For the ideal system without contact angle hysteresis, the drop position is solely dependent on the contact angle, drop volume, and sphere/ plane separation distance. Performing a geometric analysis and Surface Evolver calculations, a continuous and fully reversible transition between axisymmetric non-spherical shapes and non-axisymmetric spherical shapes is predicted. We also study these transitions experimentally, varying the contact angle using electrowetting. Then, pinning forces drastically alter the pitchfork bifurcation as the unstable branch gets stabilized, and introduce a history-dependence in the system. As a consequence, the outward movement of drops following pinning can be either continuous or discontinuous, depending on the minimum contact angle that is attained.
Original languageEnglish
Pages-
Publication statusPublished - 23 Nov 2014
Event67th Annual Meeting of the APS Division of Fluid Dynamics, APS-DFD 2014 - San Francisco, United States
Duration: 23 Nov 201425 Nov 2014
Conference number: 67

Conference

Conference67th Annual Meeting of the APS Division of Fluid Dynamics, APS-DFD 2014
Abbreviated titleAPS-DFD
CountryUnited States
CitySan Francisco
Period23/11/1425/11/14

Keywords

  • IR-93809
  • METIS-308390

Fingerprint Dive into the research topics of 'The bifurcation diagram of drops in a sphere/plane geometry: influence of contact angle hysteresis'. Together they form a unique fingerprint.

  • Cite this

    de Ruiter, R., van Gorcum, M., Semprebon, C., Duits, M. H. G., Brinkmann, M., & Mugele, F. G. (2014). The bifurcation diagram of drops in a sphere/plane geometry: influence of contact angle hysteresis. -. Abstract from 67th Annual Meeting of the APS Division of Fluid Dynamics, APS-DFD 2014, San Francisco, United States.