Vertical oscillations of droplets in small droplet clusters

Alexander A. Fedorets, Dmitrii N. Gabyshev, Dmitrii Shcherbakov, Edward Bormashenko, Leonid A. Dombrovsky, Michael Nosonovsky

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Small clusters of condensed microdroplets can levitate above a heated water surface. Vertical oscillations of small clusters (one, two, and three droplets) in the frequency range below 90 Hz are studied and compared with recently reported horizontal oscillations. Two reproducible peak frequencies are at 41.6 ± 0.4 Hz and at 49.5 ± 0.2 Hz. These frequencies are much higher than those for horizontal oscillations (between 1.61 Hz and 5.96 Hz); however, corresponding amplitudes are much smaller, which suggests equal energy distributions between the degrees of freedom. The values of effective stiffness constants are obtained from the data on equilibrium height of levitation of droplets of different sizes, and possible sources of oscillations are discussed. The oscillations are caused by aerodynamic forces, and these are same forces which are responsible for the stability of the droplet cluster.

Original languageEnglish
Article number127271
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume628
DOIs
StatePublished - 5 Nov 2021

Keywords

  • Droplet cluster
  • Droplet oscillations
  • Gas flow instability
  • Self-assembly

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