Wettability-driven water condensation at the micron and submicron scale

Yutaka Yamada, Akira Kusaba, Tatsuya Ikuta, Takashi Nishiyama, Koji Takahashi, Yasuyuki Takata

研究成果: Contribution to conferencePaper査読

1 被引用数 (Scopus)

抄録

Water condensation on a graphite surface was investigated at the micron and submicron scale by environmental scanning electron microscopy. The graphite comprised a hydrophobic terrace and hydrophilic step edges, of which the nanoscale structure was precisely measured by atomic force microscopy prior to the condensation experiments. The condensed droplets were preferentially aligned parallel to the step edges with a step height of 1 nm. The droplets featured a diameter of 150-300 nm at intervals greater than 150 nm. Shorter droplet intervals were realized by narrower terraces and higher steps. The current findings extend beyond the nucleation theory, whereby the effect of adsorbed water molecules on hydrophilic step edges was considered. The contact angle (i.e., 10°) of the nucleated droplet at its initial stage (with diameter in the nanoscale) was determined from the extended theory, and was consistent with direct observation of slightly grown droplets. The growth mechanism of the submicrometer-sized droplets was also investigated; under this scale regime, the three-phase contact line does not recede during coalescence.

本文言語英語
DOI
出版ステータス出版済み - 2014
イベント15th International Heat Transfer Conference, IHTC 2014 - Kyoto, 日本
継続期間: 8 10 20148 15 2014

その他

その他15th International Heat Transfer Conference, IHTC 2014
国/地域日本
CityKyoto
Period8/10/148/15/14

All Science Journal Classification (ASJC) codes

  • 機械工学
  • 凝縮系物理学

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