Mass Dependence of Rolling/Slipping Ratio in Sliding Acceleration of Water Droplets on a Smooth Fluoroalkylsilane Coating

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  • SUZUKI Shunsuke
    Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
  • NAKAJIMA Akira
    Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
  • SAKURADA Yuu
    Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • SAKAI Munetoshi
    Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
  • YOSHIDA Naoya
    Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park Research Center for Advanced Science and Technology, The University of Tokyo
  • HASHIMOTO Ayako
    Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
  • KAMESHIMA Yoshikazu
    Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology Kanagawa Academy of Science and Technology, 308 East, Kanagawa Science Park
  • OKADA Kiyoshi
    Department of Metallurgy and Ceramic Science, Graduate School of Science and Engineering, Tokyo Institute of Technology

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Other Title
  • 平滑なフルオロアルキルシランコーティング上での水滴の転落加速度の回転／滑り比に及ぼす水滴質量の影響

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Abstract

Using particle image velocimetry, we directly observed the internal fluidity of water droplets with various masses sliding on a smooth fluoroalkylsilane (FAS-17) coating. The water droplets slid downward with acceleration by a caterpillar-like rotation with slippage on the solid-liquid interface. The sliding acceleration of the advancing contact line was estimated using the combination of the accelerations of each motion. The contribution of rolling motion is large in the sliding acceleration of large droplets, and the smaller droplets slide down mainly with a slipping mechanism.

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