Study of condensation on hydrophobic surface with nanoscale hydrophilic regions
Water condensation on a hydrophobic surface with nanoscale hydrophilic regions was investigated to reveal the condensation mechanism of submicron-scale droplets. This feature was found on the graphite step-terrace structured surface; step surfaces are more wettable relative to terrace surfaces, and...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2015-02-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/81/823/81_14-00495/_pdf/-char/en |
| _version_ | 1811225131919343616 |
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| author | Yutaka YAMADA Akira KUSABA Tatsuya IKUTA Takashi NISHIYAMA Koji TAKAHASHI Yasuyuki TAKATA |
| author_facet | Yutaka YAMADA Akira KUSABA Tatsuya IKUTA Takashi NISHIYAMA Koji TAKAHASHI Yasuyuki TAKATA |
| author_sort | Yutaka YAMADA |
| collection | DOAJ |
| description | Water condensation on a hydrophobic surface with nanoscale hydrophilic regions was investigated to reveal the condensation mechanism of submicron-scale droplets. This feature was found on the graphite step-terrace structured surface; step surfaces are more wettable relative to terrace surfaces, and it was precisely characterized using an atomic force microscope. Condensation experiments were conducted using an environmental scanning electron microscope and droplets were observed to line up on preferentially along the graphite steps. Observed droplets ranged from 150 to 300 nm in diameter and the droplet interval depends on the width of hydrophobic region. The heterogeneous nucleation theory was extended to consider attracted water molecules on hydrophilic step surface, which enable us to explain the current observed result under unsaturated condition. As a result, proposed theory shows qualitatively that narrower hydrophobic region induces short droplet interval. Our suggestion for design the hybrid hydrophilic-hydrophobic surface would enable the development of surface that will perform high heat transfer at dropwise condensation. |
| first_indexed | 2024-04-12T09:01:45Z |
| format | Article |
| id | doaj.art-9992a8e811634e7eab48171a192d4023 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T09:01:45Z |
| publishDate | 2015-02-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-9992a8e811634e7eab48171a192d40232022-12-22T03:39:13ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612015-02-018182314-0049514-0049510.1299/transjsme.14-00495transjsmeStudy of condensation on hydrophobic surface with nanoscale hydrophilic regionsYutaka YAMADA0Akira KUSABA1Tatsuya IKUTA2Takashi NISHIYAMA3Koji TAKAHASHI4Yasuyuki TAKATA5Department of Aeronautics and Astronautics, Kyushu UniversityDepartment of Aeronautics and Astronautics, Kyushu UniversityDepartment of Aeronautics and Astronautics, Kyushu UniversityDepartment of Aeronautics and Astronautics, Kyushu UniversityDepartment of Aeronautics and Astronautics, Kyushu UniversityDepartment of Mechanical Engineering, Kyushu UniversityWater condensation on a hydrophobic surface with nanoscale hydrophilic regions was investigated to reveal the condensation mechanism of submicron-scale droplets. This feature was found on the graphite step-terrace structured surface; step surfaces are more wettable relative to terrace surfaces, and it was precisely characterized using an atomic force microscope. Condensation experiments were conducted using an environmental scanning electron microscope and droplets were observed to line up on preferentially along the graphite steps. Observed droplets ranged from 150 to 300 nm in diameter and the droplet interval depends on the width of hydrophobic region. The heterogeneous nucleation theory was extended to consider attracted water molecules on hydrophilic step surface, which enable us to explain the current observed result under unsaturated condition. As a result, proposed theory shows qualitatively that narrower hydrophobic region induces short droplet interval. Our suggestion for design the hybrid hydrophilic-hydrophobic surface would enable the development of surface that will perform high heat transfer at dropwise condensation.https://www.jstage.jst.go.jp/article/transjsme/81/823/81_14-00495/_pdf/-char/endropwise condensationhydrophilic-hydrophobic combined surfacegraphiteheterogeneous nucleation theory |
| spellingShingle | Yutaka YAMADA Akira KUSABA Tatsuya IKUTA Takashi NISHIYAMA Koji TAKAHASHI Yasuyuki TAKATA Study of condensation on hydrophobic surface with nanoscale hydrophilic regions Nihon Kikai Gakkai ronbunshu dropwise condensation hydrophilic-hydrophobic combined surface graphite heterogeneous nucleation theory |
| title | Study of condensation on hydrophobic surface with nanoscale hydrophilic regions |
| title_full | Study of condensation on hydrophobic surface with nanoscale hydrophilic regions |
| title_fullStr | Study of condensation on hydrophobic surface with nanoscale hydrophilic regions |
| title_full_unstemmed | Study of condensation on hydrophobic surface with nanoscale hydrophilic regions |
| title_short | Study of condensation on hydrophobic surface with nanoscale hydrophilic regions |
| title_sort | study of condensation on hydrophobic surface with nanoscale hydrophilic regions |
| topic | dropwise condensation hydrophilic-hydrophobic combined surface graphite heterogeneous nucleation theory |
| url | https://www.jstage.jst.go.jp/article/transjsme/81/823/81_14-00495/_pdf/-char/en |
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