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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISSN: 2688-7231 (Online)

THERMOCAPILLARY MIGRATION OF WATER DROPLETS ON SUPERHYDROPHILIC SURFACES

Kalichetty Srinivasa Sagar
Department of Mechanical Engineering, IIT Madras, Chennai, India

Daniel Orejon
International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; School of Engineering, The University of Edinburgh, Edinburgh EH9 3FB, Scotland, UK

Alexandros Askounis
International Institute for Carbon Neutral Energy Research, Kyushu University, Fukuoka, Japan; Department of Mechanical Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0375, Japan; School of Engineering, University of East Anglia, Norwich, NR4 7TJ,UK

Sivasankaran Harish
International Institute for Carbon-Neutral Energy Research (WPI - I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Sumitomo Hidaka
Faculty of Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan

Arvind Pattamatta
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai–600036, India

Sundararajan Thirumalachari
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600036, India

Yasuyuki Takata
Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

DOI: 10.1615/IHMTC-2019.1460
pages 871-876

要約

Actuation of water droplets by thermocapillary phenomenon is quite challenging due to typically large contact angles and the associated contact angle hysteresis. The present study demonstrates the migration of water droplets over UV treated TiO2 based superhydrophilic surfaces characterized by near 0° contact angle. This technique has a merit of migrating water droplets with moderate temperature gradients without the need for expensive microfabrication procedures and/or patterned wettability microheaters. The influence of droplet volume on the temporal evolution of the velocity is studied for 2µl and 6µl droplets. The thermocapillary and spreading effects on water droplet migration dynamics are qualitatively explained. Further, fluid flow and heat transfer phenomena inside the droplet during migration are elucidated from emerging thermal patterns captured using infrared (IR) thermography.

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