The influence of the drop formation rate at spreading over a microstructured surface on the contact angle

G. V. Kuznetsov, D. V. Feoktistov, E. G. Orlova, I. Yu Zykov, K. A. Batishcheva

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The article presents the experimental dependences of a macro-contact angle and the diameter of a distilled water drop spreading over solid microstructured surface on surface average roughness (Ra) and fluid flow rate (G). It has been found that at changing G from 0.005 to 0.02 ml/s, the contact angle decreases, and at a liquid flow rate over 0.02 ml/s, it increases. With small values of G (0.005−0.01 ml/s), the drop diameter grows throughout the spreading process. In the range of G from 0.02 to 0.16 ml/s at the final stage of spreading, the contact line pinning, i.e., the diam-eter constancy, has been detected. The hypothesis about the mechanism of the pinning process has been formulated: it is due to the zero sum of all forces acting on the drop (inertia, viscosity, friction, gravity, and surface tension).

Original languageEnglish
Pages (from-to)237-244
Number of pages8
JournalThermophysics and Aeromechanics
Volume25
Issue number2
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • macro-contact angle
  • microstructured surface
  • pinning
  • the drop formation rate

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics

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