Orientation effects of nanoparticle-modified surfaces with interlaced wettability on condensation heat transfer

• Published in: Applied thermal engineering Vol. 98; pp. 1054 - 1060
• Main Authors: Lee, You-An, Kuo, Long-Sheng, Su, Tsung-Wen, Hsu, Chin-Chi, Chen, Ping-Hei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 05.04.2016
• Subjects: Condensation heat transfer; Interlaced wettability; Nanoparticle-modified surface; Surface orientation; Condensation heat transfer; Nanoparticle-modified surface; Surface orientation; Interlaced wettability
• ISSN: 1359-4311
• DOI: 10.1016/j.applthermaleng.2016.01.003

•The surface with interlaced-wettability can enhance the condensation heat transfer.•Wider superhydrophobic strips increase the heat transfer for horizontal surfaces.•Narrower superhydrophobic strips increase the heat transfer for vertical surfaces. This study investigated the effects of surfaces with superhydrophobicity-based interlaced wettability on condensation heat transfer. Experiments were conducted on various types of surface with different modified strip widths under horizontal and vertical surface orientations. The experimental results revealed that the condensation heat-transfer on surfaces with interlaced wettability could be highly influenced by the surface pattern, surface orientation, and wall subcooling. Opposite trends of heat transfer were observed under different surface orientation. The experimental data of horizontal surfaces showed that the heat transfer can be enhanced when the spacing between the unmodified strips is getting wider, while the narrower spacing would increase the heat transfer more efficiently for vertical surfaces. Such the facts imply that the interlaced surface holds the potential of heat transfer enhancement, especially in the situation without the sweeping of condensates under the gravity force.