The pool boiling heat transfer characteristics of smooth single crystal and densely packed cylindrical cavity surfaces were investigated using two highly wetting fluids, perfluoro-n-hexane (FC-72) and n-hexane. Three single crystal copper surfaces and five undoped single crystal silicon surfaces with different plane orientations were considered. In addition, silicon surfaces with densely packed cylindrical cavities with diameters ranging from 9 to 75 μm, depth ranging from 9 to 20 μm, and spacing ranging from 75 to 600 μm were tested for comparison. It is observed that the copper single crystal surfaces show increasing heat transfer coefficient with decreasing atomic planar density. The single crystal silicon surfaces show increasing heat transfer coefficient with increasing atomic planar density. Plausible molecular scale mechanisms are discussed. In contrast, the silicon surfaces seeded with cylindrical cavities having diameters of 27 μm or less generally yield higher heat transfer coefficients than the single crystal silicon surfaces. A decrease in the cavity spacing results in a larger number of cavities on the surface, and the heat transfer coefficient increases as a result. Cavity depths of 6 and 20 μm result in the same heat transfer coefficient irrespective of cavity diameter. The nucleation site density for the cylindrical cavity surfaces is measured and reported at low superheat using a novel imaging technique.
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December 2013
This article was originally published in
Journal of Heat Transfer
Research-Article
An Investigation of Pool Boiling Heat Transfer on Single Crystal Surfaces and a Dense Array of Cylindrical Cavities
James Klausner,
James Klausner
1
e-mail: klaus@ufl.edu
Mechanical and Aerospace Engineering,
Mechanical and Aerospace Engineering,
University of Florida
,Gainesville, FL 32611
1Corresponding author.
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Edward McKenna
Edward McKenna
Materials Science and Engineering,
e-mail: eddie.mckenna@gmail.com
University of Florida
,Gainesville, FL 32611
e-mail: eddie.mckenna@gmail.com
Search for other works by this author on:
Bradley Bon
e-mail: bbonmeng@gmail.com
James Klausner
e-mail: klaus@ufl.edu
Mechanical and Aerospace Engineering,
Mechanical and Aerospace Engineering,
University of Florida
,Gainesville, FL 32611
Edward McKenna
Materials Science and Engineering,
e-mail: eddie.mckenna@gmail.com
University of Florida
,Gainesville, FL 32611
e-mail: eddie.mckenna@gmail.com
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 25, 2012; final manuscript received May 2, 2013; published online September 27, 2013. Assoc. Editor: Bruce L. Drolen.
J. Heat Transfer. Dec 2013, 135(12): 121501 (13 pages)
Published Online: September 27, 2013
Article history
Received:
June 25, 2012
Revision Received:
May 2, 2013
Citation
Bon, B., Klausner, J., and McKenna, E. (September 27, 2013). "An Investigation of Pool Boiling Heat Transfer on Single Crystal Surfaces and a Dense Array of Cylindrical Cavities." ASME. J. Heat Transfer. December 2013; 135(12): 121501. https://doi.org/10.1115/1.4024652
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