The combustion behavior of nanometer-scale energetic materials is much different than micron size or larger materials. Burning rates up to 950 m∕s have been reported for a thermite composition of nanosized aluminum and molybdenum trioxide. The energy transport mechanisms in the reactive wave are still uncertain. The relative contribution of radiation has not yet been quantified. To do so analytically requires dependent scattering theory, which has not yet been fully developed. Radiative properties for nanoaluminum and nanomolybdenum-trioxide were obtained experimentally by comparing light scattering measurements on a one-dimensional slab of powder with multiple-scattering simulations using Monte Carlo and discrete ordinate methods. The equivalent isotropic-scattering extinction coefficient for close-packed molybdenum trioxide (MoO3) nanopowder was found to be ; the equivalent isotropic-scattering albedo was . Aluminum (Al), which proved to be more difficult to work with, had an albedo of 0.35 and 0.38 from two tests. The radiative conductivity based on the MoO3 results is two orders of magnitude less than the diffusive thermal conductivity, indicating that radiation is not a dominant heat transfer mode for the reactive wave propagation of nanothermites under optically thick conditions.
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Research Papers
Radiative Properties of and Al Nanopowders From Light-Scattering Measurements
S. M. Begley,
S. M. Begley
Mechanical Science and Engineering Department,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
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M. Q. Brewster
M. Q. Brewster
Mechanical Science and Engineering Department,
e-mail: Brewster@uiuc.edu
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
Search for other works by this author on:
S. M. Begley
Mechanical Science and Engineering Department,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801
M. Q. Brewster
Mechanical Science and Engineering Department,
University of Illinois at Urbana-Champaign
, Urbana, IL 61801e-mail: Brewster@uiuc.edu
J. Heat Transfer. May 2007, 129(5): 624-633 (10 pages)
Published Online: June 28, 2006
Article history
Received:
June 15, 2005
Revised:
June 28, 2006
Citation
Begley, S. M., and Brewster, M. Q. (June 28, 2006). "Radiative Properties of and Al Nanopowders From Light-Scattering Measurements." ASME. J. Heat Transfer. May 2007; 129(5): 624–633. https://doi.org/10.1115/1.2712476
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