The influence of the drop formation rate at spreading over a microstructured surface on the contact angle
- Authors: Kuznetsov G.V.1, Feoktistov D.V.2, Orlova E.G.1, Zykov I.Y.1, Batishcheva K.A.1
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Affiliations:
- Tomsk Polytechnic University
- Kutateladze Institute of Thermophysics SB RAS
- Issue: Vol 25, No 2 (2018)
- Pages: 237-244
- Section: Article
- URL: https://journals.rcsi.science/1531-8699/article/view/217432
- DOI: https://doi.org/10.1134/S0869864318020099
- ID: 217432
Cite item
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).
About the authors
G. V. Kuznetsov
Tomsk Polytechnic University
Email: lafleur@tpu.ru
Russian Federation, Tomsk
D. V. Feoktistov
Kutateladze Institute of Thermophysics SB RAS
Email: lafleur@tpu.ru
Russian Federation, Novosibirsk
E. G. Orlova
Tomsk Polytechnic University
Author for correspondence.
Email: lafleur@tpu.ru
Russian Federation, Tomsk
I. Yu. Zykov
Tomsk Polytechnic University
Email: lafleur@tpu.ru
Russian Federation, Tomsk
K. A. Batishcheva
Tomsk Polytechnic University
Email: lafleur@tpu.ru
Russian Federation, Tomsk