Surface wettability effects in heat and fluid flow

研究成果: 著書/レポートタイプへの貢献会議での発言

3 引用 (Scopus)

抄録

Effects of surface wettability on liquid-vapor phase change phenomena and single- and two-phase flow in tube have been studied in wide range of contact angles using superhydrophilic (SH) and super-water-repellent (SWR) surfaces. Heat transfer in falling film evaporation on a TiO2-coated SH surface is tremendously enhanced due to very thin stable film. In pool boiling, critical heat flux (CHF) and minimum heat flux (MHF) increase with the decrease in contact angle. Wetting limit temperature of water drop on heated surface increases with the decrease in contact angle. In pool boiling on SWR surface, bubble nucleation and film boiling occur in extremely small superheating. Drag reduction was observed in water flow in tube with SWR coating in laminar flow region, and on the other hand, in two-phase flow pressure drop for the SH wall is smaller than that for the SWR wall.

元の言語英語
ホスト出版物のタイトルProceedings of the 4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006
ページ1333-1341
ページ数9
2006 B
出版物ステータス出版済み - 2006
イベント4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006 - Limerick, アイルランド
継続期間: 6 19 20066 21 2006

その他

その他4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006
アイルランド
Limerick
期間6/19/066/21/06

Fingerprint

Wetting
Flow of fluids
Heat transfer
Boiling liquids
Contact angle
Water
Two phase flow
Heat flux
Drag reduction
Bubbles (in fluids)
Laminar flow
Pressure drop
Evaporation
Nucleation
Vapors
Coatings
Liquids
Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

これを引用

Takata, Y. (2006). Surface wettability effects in heat and fluid flow. : Proceedings of the 4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006 (巻 2006 B, pp. 1333-1341)

Surface wettability effects in heat and fluid flow. / Takata, Yasuyuki.

Proceedings of the 4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006. 巻 2006 B 2006. p. 1333-1341.

研究成果: 著書/レポートタイプへの貢献会議での発言

Takata, Y 2006, Surface wettability effects in heat and fluid flow. : Proceedings of the 4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006. 巻. 2006 B, pp. 1333-1341, 4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006, Limerick, アイルランド, 6/19/06.
Takata Y. Surface wettability effects in heat and fluid flow. : Proceedings of the 4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006. 巻 2006 B. 2006. p. 1333-1341
Takata, Yasuyuki. / Surface wettability effects in heat and fluid flow. Proceedings of the 4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006. 巻 2006 B 2006. pp. 1333-1341
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AB - Effects of surface wettability on liquid-vapor phase change phenomena and single- and two-phase flow in tube have been studied in wide range of contact angles using superhydrophilic (SH) and super-water-repellent (SWR) surfaces. Heat transfer in falling film evaporation on a TiO2-coated SH surface is tremendously enhanced due to very thin stable film. In pool boiling, critical heat flux (CHF) and minimum heat flux (MHF) increase with the decrease in contact angle. Wetting limit temperature of water drop on heated surface increases with the decrease in contact angle. In pool boiling on SWR surface, bubble nucleation and film boiling occur in extremely small superheating. Drag reduction was observed in water flow in tube with SWR coating in laminar flow region, and on the other hand, in two-phase flow pressure drop for the SH wall is smaller than that for the SWR wall.

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