Superhydrophobic surfaces exhibit large contact angle and small hysteresis which promote liquid transport and enhance heat transfer. Here, liquid-vapor phase change behavior is reported on superhydrophobic surfaces with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking the surface structure of lotus leaves. Compared to one-tier microtexture which energetically favors the Wenzel state, the two-tier texture with nanoscale roughness favors the Cassie state, the desired superhydrophobic state. During droplet evaporation, the two-tier texture delays the transition from Cassie to Wenzel state. Using two-tier texture with hexadeconethiol coating, continuous dropwise condensation was demonstrated for the first time on engineered superhydrophobic surfaces.
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ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer
June 6–9, 2008
Tainan, Taiwan
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4292-4
PROCEEDINGS PAPER
Evaporation and Condensation on Two-Tier Superhydrophobic Surfaces
Chuan-Hua Chen
,
Chuan-Hua Chen
Teledyne Scientific Company, Camino Dos Rios, CA
Search for other works by this author on:
Qingjun Cai
,
Qingjun Cai
Teledyne Scientific Company, Camino Dos Rios, CA
Search for other works by this author on:
Chung-Lung Chen
Chung-Lung Chen
Teledyne Scientific Company, Camino Dos Rios, CA
Search for other works by this author on:
Chuan-Hua Chen
Teledyne Scientific Company, Camino Dos Rios, CA
Qingjun Cai
Teledyne Scientific Company, Camino Dos Rios, CA
Chung-Lung Chen
Teledyne Scientific Company, Camino Dos Rios, CA
Paper No:
MNHT2008-52355, pp. 1021-1022; 2 pages
Published Online:
June 22, 2009
Citation
Chen, C, Cai, Q, & Chen, C. "Evaporation and Condensation on Two-Tier Superhydrophobic Surfaces." Proceedings of the ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B. Tainan, Taiwan. June 6–9, 2008. pp. 1021-1022. ASME. https://doi.org/10.1115/MNHT2008-52355
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