In this study, we investigated the dynamic behavior of a water droplet near the Leidenfrost point (LFP) of bare and modified zirconium alloy surfaces with bundles of nanotubes (∼10–100 nm) or micro mountain-like structures using high-speed photography. A deionized water droplet (6 μL) was dropped onto the sample surfaces (20 × 25 × 0.7 mm) that were heated to temperatures ranging from 250°C to the LFP. The modified zirconium alloy surfaces showed complete wetting and well-spread features at room temperature due to strong liquid spreading by the structure. The meniscus of the liquid droplet on the structured surface experienced more vigorous dynamics with intensive nucleate boiling, compared with the clean, bare surface. The cutback phenomenon was observed on the bare surface; however, the structured surfaces showed a water droplet “burst”. We observed that the LFPs were 449°C, 522°C, and 570°C, corresponding to the bare, micro-, and nano-structures, respectively.
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ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting
July 8–12, 2012
Rio Grande, Puerto Rico, USA
Conference Sponsors:
- Heat Transfer Division
- Fluids Engineering Division
ISBN:
978-0-7918-4479-3
PROCEEDINGS PAPER
Dynamics of a Water Droplet on the Heated Surface of Nano- and Micro-Structures Available to Purchase
Seol Ha Kim,
Seol Ha Kim
POSTECH, Pohang, Kyung-buk, Korea
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Ho Seon Ahn,
Ho Seon Ahn
POSTECH, Pohang, Kyung-buk, Korea
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Joonwon Kim,
Joonwon Kim
POSTECH, Pohang, Kyung-buk, Korea
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Moo Hwan Kim
Moo Hwan Kim
POSTECH, Pohang, Kyung-buk, Korea
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Seol Ha Kim
POSTECH, Pohang, Kyung-buk, Korea
Ho Seon Ahn
POSTECH, Pohang, Kyung-buk, Korea
Joonwon Kim
POSTECH, Pohang, Kyung-buk, Korea
Moo Hwan Kim
POSTECH, Pohang, Kyung-buk, Korea
Paper No:
ICNMM2012-73316, pp. 751-760; 10 pages
Published Online:
July 22, 2013
Citation
Kim, SH, Ahn, HS, Kim, J, & Kim, MH. "Dynamics of a Water Droplet on the Heated Surface of Nano- and Micro-Structures." Proceedings of the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 751-760. ASME. https://doi.org/10.1115/ICNMM2012-73316
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