ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Sensors and Materials,
Volume 30, Number 6(1) (2018)

Copyright(C) MYU K.K. All Rights Reserved.
pp. 1307-1318
S&M1586
https://doi.org/10.18494/SAM.2018.1944
Published: June 14, 2018

Effect of Superhydrophobic/Hydrophilic Surfaces on Dynamic Radius of Water Droplet Impact [PDF]

Masaki Yamaguchi, Shunsuke Tamura, and Tetsuhiro Sakata

(Received March 22, 2018; Accepted May 15, 2018)

Keywords: droplet impact, dynamic contact angle, interfacial tension, numerical analysis, superhydrophobic surface

In this research, we aim to investigate the dynamic contact angle between water droplets and three different surfaces from the hydrophilic (<90°) to the superhydrophobic region (≅150° in ambient air. The dynamic contact angle and the triple line velocity were experimentally determined from a two-dimensional projection recorded with a high-speed camera in a backlighting setup. The findings from the experiment were used to determine the model parameters of an empirical dynamic contact angle model, which was subsequently used in three-dimensional (3D) numerical simulations. The focus of this work is on the advancing and receding contact angles over the triple line velocity, which is approximated by the model used. The behaviors on the different surfaces were analyzed in detail using the capillary number, and different regimes were identified. It was demonstrated that with the adjusted model, the simulation results regarding the droplet diameter were improved compared with the simulations using static (equilibrium) contact angle models. Thus, it was clarified that the contact angle at the reversal point should be taken and not the static contact angle. Additionally, it was concluded that only one contact angle is needed for a super-hydrophobic system.

Corresponding author: Masaki Yamaguchi


Cite this article
Masaki Yamaguchi, Shunsuke Tamura, and Tetsuhiro Sakata, Effect of Superhydrophobic/Hydrophilic Surfaces on Dynamic Radius of Water Droplet Impact, Sens. Mater., Vol. 30, No. 6, 2018, p. 1307-1318.


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