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.
|ホスト出版物のタイトル||Proceedings of the 4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006|
|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 2006 → 6 21 2006
|その他||4th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2006|
|期間||6/19/06 → 6/21/06|
All Science Journal Classification (ASJC) codes