The evaporation and combustion of nanometric aluminum particles with an oxidizer MoO3 is analyzed. The analysis was performed to correlate individual Al particle gasification rates to macroscopic flame propagation rates observed in flame tube experiments. Examination of various characteristic times relevant to propagation of a deflagration reveals that particles below about 1.7 nm in diameter evaporate before appreciable chemical reactions occur. Experimental studies use Al particles greater than 1.7 nm in diameter such that a diffusion flame model was developed to better understand the combustion dynamics of multiphase Al particles. The results showed that it is unlikely that droplets will fully evaporate before reacting in the gas phase. A droplet evaporation and combustion model was further applied to quantify single droplet reaction velocities in comparison to the bulk flame propagation measurements observed in the literature. The diffusion flame model predicted orders of magnitude slower propagation rates than experimentally observed. These results imply that another reaction mechanism is responsible for promoting reaction propagation or modes other than diffusion play a more dominant role in flame propagation.
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ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels
July 8–12, 2012
Rio Grande, Puerto Rico, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4478-6
PROCEEDINGS PAPER
Deflagration Analysis of Aluminum Droplet Combustion Available to Purchase
Birce Dikici,
Birce Dikici
Embry-Riddle Aeronautical University, Daytona Beach, FL
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M. L. Pantoya,
M. L. Pantoya
Texas Tech University, Lubbock, TX
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B. D. Shaw
B. D. Shaw
University of California, Davis, CA
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Birce Dikici
Embry-Riddle Aeronautical University, Daytona Beach, FL
M. L. Pantoya
Texas Tech University, Lubbock, TX
B. D. Shaw
University of California, Davis, CA
Paper No:
HT2012-58553, pp. 263-271; 9 pages
Published Online:
July 24, 2013
Citation
Dikici, B, Pantoya, ML, & Shaw, BD. "Deflagration Analysis of Aluminum Droplet Combustion." Proceedings of the ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 263-271. ASME. https://doi.org/10.1115/HT2012-58553
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