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Open AccessArticle

Pinned Droplet Size on a Superhydrophobic Surface in Shear Flow

Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
Frontier Technology Development Unit, Research and Development Div., Nippon Paint Surf Chemicals Co., LTD, Shinagawa, Tokyo 140-8675, Japan
Department of Mechanical Engineering, Kanagawa Institute of Technology, Atsugi, Kanagawa 243-0292, Japan
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Aerospace 2020, 7(3), 34;
Received: 1 February 2020 / Revised: 17 March 2020 / Accepted: 18 March 2020 / Published: 21 March 2020
(This article belongs to the Special Issue Deicing and Anti-Icing of Aircraft)
The recent development of a superhydrophobic surface enhances the droplet shedding under a shear flow. The present study gives insights into the effects of shear flow on a pinned droplet over a superhydrophobic surface. To experimentally simulate the change in the size of a sessile droplet on an aerodynamic surface, the volume of the pinned droplet is expanded by water supplied through a pore. Under a continuous airflow that provides a shear flow over the superhydrophobic surface, the size of a pinned water droplet shed from the surface is experimentally characterized. The air velocity ranges from 8 to 61 m/s, and the size of pinned droplets shed at a given air velocity is measured using an instantaneous snapshot captured with a high-speed camera. It is found that the size of the shedding pinned droplet decreases as air velocity increases. At higher air velocities, shedding pinned droplets are fully immersed in the boundary layer. The present findings give a correlation between critical air velocity and the size of pinned droplets shed from the pore over the superhydrophobic surface. View Full-Text
Keywords: droplet shedding; shear flow; superhydrophobic surface droplet shedding; shear flow; superhydrophobic surface
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MDPI and ACS Style

Hasegawa, M.; Morita, K.; Sakaue, H.; Kimura, S. Pinned Droplet Size on a Superhydrophobic Surface in Shear Flow. Aerospace 2020, 7, 34.

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