In the present work, the effect of surface features and wettability on the Leidenfrost temperature are experimentally investigated. The surface features were fabricated on a 304 stainless steel surface using a femtosecond laser. This technique allows for a wide variety of surface microstructures (spikes, mounds, holes, and pyramids) to be created, ranging in size, shape, and spacing. Changing the fluence and shots of the laser produce different micro/nano textured surfaces. A smooth surface sample was fabricated as a reference surface with a measured Leidenfrost temperature as a benchmark. The droplet lifetime experimental method was employed to determine the Leidenfrost temperature for both the smooth and the textured surfaces. A precision dropper was used to control the droplet size to 4.2 microliters (diameter of 2.0mm) while surface temperatures were measured by means of an embedded thermocouple. In comparison to the smooth stainless steel surface, a shift in the Leidenfrost temperature, as high as 55 °C, was observed with the textured surface. The textured surface hasa high emissivity, compared to the smooth surface. As a result, in addition to the shift in the Leidenfrost temperature, significant enhancement of the film boiling heat transfer coefficients were also observed.
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ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology
July 14–19, 2013
Minneapolis, Minnesota, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-5548-5
PROCEEDINGS PAPER
Controlling the Leidenfrost Temperature Through Laser-Assisted Surface Micro/Nano Texturing
Corey Kruse,
Corey Kruse
University of Nebraska-Lincoln, Lincoln, NE
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Troy Anderson,
Troy Anderson
University of Nebraska-Lincoln, Lincoln, NE
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Dennis Alexander,
Dennis Alexander
University of Nebraska-Lincoln, Lincoln, NE
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George Gogos,
George Gogos
University of Nebraska-Lincoln, Lincoln, NE
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Sidy Ndao
Sidy Ndao
University of Nebraska-Lincoln, Lincoln, NE
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Corey Kruse
University of Nebraska-Lincoln, Lincoln, NE
Troy Anderson
University of Nebraska-Lincoln, Lincoln, NE
Dennis Alexander
University of Nebraska-Lincoln, Lincoln, NE
George Gogos
University of Nebraska-Lincoln, Lincoln, NE
Sidy Ndao
University of Nebraska-Lincoln, Lincoln, NE
Paper No:
HT2013-17771, V002T07A025; 7 pages
Published Online:
December 21, 2013
Citation
Kruse, C, Anderson, T, Alexander, D, Gogos, G, & Ndao, S. "Controlling the Leidenfrost Temperature Through Laser-Assisted Surface Micro/Nano Texturing." Proceedings of the ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer in Multiphase Systems; Heat and Mass Transfer in Biotechnology. Minneapolis, Minnesota, USA. July 14–19, 2013. V002T07A025. ASME. https://doi.org/10.1115/HT2013-17771
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