Direct Observation of Water Droplet Motion on a Hydrophobic Self-assembled Monolayer Surface under Airflow

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  • HASHIMOTO Ayako
    Kanagawa Academy of Science and Technology
  • SAKAI Munetoshi
    Kanagawa Academy of Science and Technology
  • SONG Jeong-Hwag
    Kanagawa Academy of Science and Technology
  • YOSHIDA Naoya
    Kanagawa Academy of Science and Technology Research Center for Advanced Science and Technology, The University of Tokyo
  • SUZUKI Shunsuke
    Kanagawa Academy of Science and Technology Graduate School of Science and Engineering, Tokyo Institute of Technology
  • KAMESHIMA Yoshikazu
    Kanagawa Academy of Science and Technology Graduate School of Science and Engineering, Tokyo Institute of Technology
  • NAKAJIMA Akira
    Kanagawa Academy of Science and Technology Graduate School of Science and Engineering, Tokyo Institute of Technology

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A wind tunnel to produce a uniform air stream and a high-speed camera system assembled for this study enabled direct and simultaneous measurements of sliding droplets' shape and acceleration. Using this system, wind velocity dependence of deformation and the moving acceleration of a water droplet on an inclined octadecyltrimethoxysilane (ODS) coating were investigated. The motions of a water droplet in an air stream are classifiable into three : sliding, stopping, and climbing. In the sliding zone, the sliding acceleration decreases with increasing wind velocity. During stopping, the droplet shape changes from a forward-bent to backward-bent posture against the surface inclination. In the climbing zone under large wind velocity, water droplets have large climbing acceleration with large shape deformation.

収録刊行物

  • 表面技術

    表面技術 59 (12), 907-907, 2008

    一般社団法人 表面技術協会

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