The effect of added Al2O3 on the propagation behavior of an Al/CuO nanoscale thermite

J. Y. Malchi, Richard A. Yetter, T. J. Foley, S. F. Son

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Three types of experiments were performed on an Al/CuO nanoscale thermite to understand the effect of adding a diluent (40nm Al2O3 particles) to the mixture: the constant volume pressure cell, the unconfined burn tray, and the instrumented burn tube. The addition of Al2O3 decreased the pressure output and reaction velocity in all three experiments. Burn tube measurements showed three reaction velocity regimes: constant velocity observed when 0% (633m/s) and 5% (570m/s) of the total weight is Al2O3, constant acceleration observed at 10% (146m/s to 544m/s over a distance of 6cm) and 15% (69m/s to 112m/s over a distance of 6cm) Al2O3, and an unstable, spiraling combustion wave at 20% Al2O3. The pressure measurements correlated to these three regimes showing a dropoff in peak pressure as Al2O3 was added to the system, with relatively no pressure increase observed when 20% of the total weight was Al2O3. Equilibrium calculations showed that the addition of Al2O3 to an Al/CuO mixture lowered the flame temperature, reducing the amount of combustion products in the gas phase, thus, hindering the presumed primary mode of forward heat transfer, convection.

Original languageEnglish (US)
Pages (from-to)1278-1294
Number of pages17
JournalCombustion science and technology
Volume180
Issue number7
DOIs
StatePublished - Jul 1 2008

Fingerprint

thermites
propagation
trays
tubes
Heat convection
combustion products
flame temperature
diluents
flame propagation
pressure measurement
Pressure measurement
convection
Gases
Experiments
heat transfer
vapor phases
output
cells
Temperature

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Engineering (miscellaneous)
  • Fluid Flow and Transfer Processes

Cite this

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abstract = "Three types of experiments were performed on an Al/CuO nanoscale thermite to understand the effect of adding a diluent (40nm Al2O3 particles) to the mixture: the constant volume pressure cell, the unconfined burn tray, and the instrumented burn tube. The addition of Al2O3 decreased the pressure output and reaction velocity in all three experiments. Burn tube measurements showed three reaction velocity regimes: constant velocity observed when 0{\%} (633m/s) and 5{\%} (570m/s) of the total weight is Al2O3, constant acceleration observed at 10{\%} (146m/s to 544m/s over a distance of 6cm) and 15{\%} (69m/s to 112m/s over a distance of 6cm) Al2O3, and an unstable, spiraling combustion wave at 20{\%} Al2O3. The pressure measurements correlated to these three regimes showing a dropoff in peak pressure as Al2O3 was added to the system, with relatively no pressure increase observed when 20{\%} of the total weight was Al2O3. Equilibrium calculations showed that the addition of Al2O3 to an Al/CuO mixture lowered the flame temperature, reducing the amount of combustion products in the gas phase, thus, hindering the presumed primary mode of forward heat transfer, convection.",
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The effect of added Al2O3 on the propagation behavior of an Al/CuO nanoscale thermite. / Malchi, J. Y.; Yetter, Richard A.; Foley, T. J.; Son, S. F.

In: Combustion science and technology, Vol. 180, No. 7, 01.07.2008, p. 1278-1294.

Research output: Contribution to journalArticle

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