Instabilities of drops detaching from a circular capillary tip

  • Talmira Kairaliyeva K.I. Satpayev Kazakh National Technical Research University, Almaty, Kazakhstan; Max Planck Institute of Colloids and Interfaces, 14424 Potsdam/Golm, Germany
  • Mohsen Karbaschi Max Planck Institute of Colloids and Interfaces, 14424 Potsdam/Golm, Germany
  • Mohhammad Taeibi-Rahni Sharif University of Technology, Teheran, Iran; Max Planck Institute of Colloids and Interfaces, 14424 Potsdam/Golm, Germany
  • Samee Faraji Max Planck Institute of Colloids and Interfaces, 14424 Potsdam/Golm, Germany
  • Karl Schano Gamma-Service, Berlin, Germany
  • Michael Born Max Planck Institute of Colloids and Interfaces, 14424 Potsdam/Golm, Germany
  • Saule Aidarova K.I. Satpayev Kazakh National Technical Research University, Almaty, Kazakhstan
  • Reinhard Miller Max Planck Institute of Colloids and Interfaces, 14424 Potsdam/Golm, Germany
DOI: https://doi.org/10.15328/cb887
Keywords: single drop dynamic, drop volume tensiometry, hydrodynamic instabilities, drop size bifurcations, effects of viscosity, effect of surface tension

Abstract

When drops are formed at circular capillaries at high liquid flow rates, the relation between surface tension and drop volume is often not linear but shows irregularities. These volume bifurcations and other more complex pattern of detaching drops for pure liquids depend on the bulk viscosity and the surface tension. In this study, it has been shown that liquids with high surface tensions and low viscosities, such as pure water, show complex pattern of drop times. When the surface tensions are much lower, such as for pure ethanol, and the bulk viscosity is high enough, such as for water:glycerol mixtures with a glycerol content of 75% and more, the bifurcations decrease or disappear.

References

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Published
2017-12-12
How to Cite
Kairaliyeva, T., Karbaschi, M., Taeibi-Rahni, M., Faraji, S., Schano, K., Born, M., Aidarova, S., & Miller, R. (2017). Instabilities of drops detaching from a circular capillary tip. Chemical Bulletin of Kazakh National University, 86(3), 42-47. https://doi.org/https://doi.org/10.15328/cb887
Issue
Vol 86 No 3 (2017): Chemical Bulletin of Kazakh National University
Section
Physical Chemistry and Electrochemistry
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