Reactive wave propagation mechanisms in energetic porous silicon composites

Venkata Sharat Parimi, Srinivas A. Tadigadapa, Richard A. Yetter

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Propagating reactive waves through porous silicon (PS)-sodium perchlorate composites and the generation of shock waves in the gaseous medium above the PS surface were studied using high-speed shadowgraphy. Propagation speeds were varied by changing the PS specific surface area (SSA) and the dopant type and level, and by the addition of organized microstructures along the wave propagation direction. Shadowgraph analysis showed that upstream permeation of hot gaseous combustion products was responsible for a two order of magnitude enhancement in the reactive wave propagation speeds obtained by the presence of organized microscale patterns on PS samples with low SSA ( 300 m2/g), which nominally exhibit baseline speeds of 1 m/s. Shadowgraph analysis and sound speed measurements on PS samples with high SSA ( 700 m2/g), which exhibit fast reactive wave propagations of 1000 m/s, indicated that neither the strong shock over the PS surface nor detonation of the porous layer were the mechanisms by which the wave propagated. Thermal analysis of PS showed that the heat release from exothermic reactions between PS and the oxidizer within the pores shifted to lower temperatures as the SSA of PS increased, which was accompanied by a reduction in the activation energy associated with the lowest temperature exothermic reaction between PS and the oxidizer. The combined experiments indicated that a combination of conductive and convective burning, possibly assisted by fast crack propagation within the silicon/porous silicon substrate, was responsible for the observed difference in propagation speeds and was the mechanism by which the reactive wave propagated with speeds on the order of a km/s within the porous layers.

Original languageEnglish (US)
Pages (from-to)249-268
Number of pages20
JournalCombustion science and technology
Volume187
Issue number1-2
DOIs
StatePublished - Jan 1 2015

Fingerprint

Porous silicon
porous silicon
Wave propagation
wave propagation
composite materials
Composite materials
Specific surface area
shadowgraph photography
Exothermic reactions
exothermic reactions
oxidizers
combustion products
propagation
crack propagation
Detonation
perchlorates
detonation
Permeation
Shock waves
microbalances

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

Parimi, Venkata Sharat ; Tadigadapa, Srinivas A. ; Yetter, Richard A. / Reactive wave propagation mechanisms in energetic porous silicon composites. In: Combustion science and technology. 2015 ; Vol. 187, No. 1-2. pp. 249-268.
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Reactive wave propagation mechanisms in energetic porous silicon composites. / Parimi, Venkata Sharat; Tadigadapa, Srinivas A.; Yetter, Richard A.

In: Combustion science and technology, Vol. 187, No. 1-2, 01.01.2015, p. 249-268.

Research output: Contribution to journalArticle

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