It has recently been suggested that the accommodation coefficient of nano-aluminum/alumina particles may be significantly smaller than previously assumed. This result has significant implications on the heat transfer and performance of the nanoparticles in combustion environments. Currently, the accommodation coefficient has been deduced only after assuming a combustion model for the nano-aluminum particle and changing the accommodation coefficient to fit experimental temperature data. Direct measurement is needed in order to decouple the accommodation coefficient from the assumed combustion mechanism. Time-resolved laser-induced incandescence (TiRe-LII) measurements were performed to measure the accommodation coefficient of nano-alumina particles in various gaseous environments. The accommodation coefficient was found to be 0.03, 0.07, and 0.15 in helium, nitrogen, and argon, respectively, at 300 K and 2 atm in each environment. These values represent upper limits for the accommodation coefficient as it is expected to decrease with increasing ambient temperature. The values are similar to what has been seen for other metallic nanoparticles and significantly smaller than values used in soot measurements. The results will allow for additional modeling of the accommodation coefficient extended to other environments and support previous measurements of high combustion temperatures during nano-aluminum combustion.
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November 2016
This article was originally published in
Journal of Heat Transfer
Research-Article
Nano-Alumina Accommodation Coefficient Measurement Using Time-Resolved Laser-Induced Incandescence
David Allen,
David Allen
Department of Mechanical Engineering,
University of Illinois Urbana—Champaign,
Champaign, IL 61801
e-mail: djallen2@illinois.edu
University of Illinois Urbana—Champaign,
Champaign, IL 61801
e-mail: djallen2@illinois.edu
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Herman Krier,
Herman Krier
Department of Mechanical Engineering,
University of Illinois Urbana—Champaign,
Champaign, IL 61801
University of Illinois Urbana—Champaign,
Champaign, IL 61801
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Nick Glumac
Nick Glumac
Department of Mechanical Engineering,
University of Illinois Urbana—Champaign,
Champaign, IL 61801
University of Illinois Urbana—Champaign,
Champaign, IL 61801
Search for other works by this author on:
David Allen
Department of Mechanical Engineering,
University of Illinois Urbana—Champaign,
Champaign, IL 61801
e-mail: djallen2@illinois.edu
University of Illinois Urbana—Champaign,
Champaign, IL 61801
e-mail: djallen2@illinois.edu
Herman Krier
Department of Mechanical Engineering,
University of Illinois Urbana—Champaign,
Champaign, IL 61801
University of Illinois Urbana—Champaign,
Champaign, IL 61801
Nick Glumac
Department of Mechanical Engineering,
University of Illinois Urbana—Champaign,
Champaign, IL 61801
University of Illinois Urbana—Champaign,
Champaign, IL 61801
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 1, 2014; final manuscript received May 15, 2016; published online July 19, 2016. Assoc. Editor: Robert D. Tzou.
J. Heat Transfer. Nov 2016, 138(11): 112401 (8 pages)
Published Online: July 19, 2016
Article history
Received:
October 1, 2014
Revised:
May 15, 2016
Citation
Allen, D., Krier, H., and Glumac, N. (July 19, 2016). "Nano-Alumina Accommodation Coefficient Measurement Using Time-Resolved Laser-Induced Incandescence." ASME. J. Heat Transfer. November 2016; 138(11): 112401. https://doi.org/10.1115/1.4033642
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