Combustion of nanoscale Al/MoO3 thermite in microchannels

S. F. Son, B. W. Asay, T. J. Foley, Richard A. Yetter, M. H. Wu, Grant Alexander Risha

Research output: Contribution to journalArticle

129 Citations (Scopus)

Abstract

Microscale combustion is of interest in small-volume energy-demanding systems, such as power supplies, actuation, Ignition, and propulsion. Energetic materials can have high burning rates that make these materials advantageous, especially for microscale applications in which the rate of energy release is important or in which air is not available as an oxidizer. In this study we examine the combustion of mixtures of nanoscale aluminum with molybdenum trioxide in microscale channels. Nanoscale composites can have very high burning rates that are much higher than typical materials. Quartz and acrylic tubes are used. Rectangular steel microchannels are also considered. We find that the optimum mixture ratio for the maximum propagation rate is aluminum rich. We use equilibrium calculations to argue that the propagation rate is dominated by a convective process where hot liquids and gases are propelled forward heating the reactants. This is the first study to report the dependence of the propagation rate with a tube diameter for this class of materials. We find that the propagation rate decreases linearly with 1/d. The propagation rate remains high in tubes or channels with dimensions down to the scale of 100 μm, which makes these materials applicable to microcombustion applications.

Original languageEnglish (US)
Pages (from-to)715-721
Number of pages7
JournalJournal of Propulsion and Power
Volume23
Issue number4
DOIs
StatePublished - Jul 1 2007

Fingerprint

thermites
microchannels
Microchannels
combustion
propagation
microbalances
burning rate
tubes
Aluminum
Propulsion
Molybdenum
Acrylics
aluminum
Ignition
Quartz
oxidizers
propulsion
actuation
Heating
power supplies

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Aerospace Engineering
  • Mechanical Engineering
  • Space and Planetary Science

Cite this

Son, S. F. ; Asay, B. W. ; Foley, T. J. ; Yetter, Richard A. ; Wu, M. H. ; Risha, Grant Alexander. / Combustion of nanoscale Al/MoO3 thermite in microchannels. In: Journal of Propulsion and Power. 2007 ; Vol. 23, No. 4. pp. 715-721.
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Combustion of nanoscale Al/MoO3 thermite in microchannels. / Son, S. F.; Asay, B. W.; Foley, T. J.; Yetter, Richard A.; Wu, M. H.; Risha, Grant Alexander.

In: Journal of Propulsion and Power, Vol. 23, No. 4, 01.07.2007, p. 715-721.

Research output: Contribution to journalArticle

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AU - Risha, Grant Alexander

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