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Enhanced convective heat transfer in nongas generating nanoparticle thermites / S. W. Dean in Journal of heat transfer, Vol. 132 N° 11 (Novembre 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 11 (Novembre 2010) . - pp.[111201-1/7] Titre : Enhanced convective heat transfer in nongas generating nanoparticle thermites Type de document : texte imprimé Auteurs : S. W. Dean, Auteur ; M. L. Pantoya, Auteur ; A. E. Gash, Auteur Année de publication : 2010 Article en page(s) : pp.[111201-1/7] Note générale : Physique Langues : Anglais (eng) Mots-clés : Nanocomposites  Enhanced  convection  reaction  mechanisms  Nano-alumium  Thermites  CuO  NiO  Peak  pressures  Flame  speeds  Flame  speeds  DSC  TGA  XRD  Gas  generation  Flame  propagation Index. décimale : 536 Chaleur. Thermodynamique Résumé : Flame propagation and peak pressure measurements were taken of two nanoscaled thermites using aluminum (Al) fuel and copper oxide (CuO) or nickel oxide (NiO) oxidizers in a confined flame tube apparatus. Thermal equilibrium simulations predict that the Al+CuO reaction exhibits high gas generation and, thus, high convective flame propagation rates while the Al+NiO reaction produces little to no gas and, therefore, should exhibit much lower flame propagation rates. Results show flame propagation rates ranged between 200 m/s and 600 m/s and peak pressures ranged between 1.7 MPa and 3.7 MPa for both composites. These results were significantly higher than expected for the Al+NiO, which generates virtually no gas. For nanometric Al particles, oxidation has recently been described by a melt-dispersion oxidation mechanism that involves a dispersion of high velocity alumina shell fragments and molten Al droplets that promote a pressure build-up by inducing a bulk movement of fluid. This mechanism unique to nanoparticle reaction may promote convection without the need for additional gas generation. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Enhanced convective heat transfer in nongas generating nanoparticle thermites [texte imprimé] / S. W. Dean, Auteur ; M. L. Pantoya, Auteur ; A. E. Gash, Auteur . - 2010 . - pp.[111201-1/7]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 11 (Novembre 2010) . - pp.[111201-1/7] Mots-clés : Nanocomposites  Enhanced  convection  reaction  mechanisms  Nano-alumium  Thermites  CuO  NiO  Peak  pressures  Flame  speeds  Flame  speeds  DSC  TGA  XRD  Gas  generation  Flame  propagation Index. décimale : 536 Chaleur. Thermodynamique Résumé : Flame propagation and peak pressure measurements were taken of two nanoscaled thermites using aluminum (Al) fuel and copper oxide (CuO) or nickel oxide (NiO) oxidizers in a confined flame tube apparatus. Thermal equilibrium simulations predict that the Al+CuO reaction exhibits high gas generation and, thus, high convective flame propagation rates while the Al+NiO reaction produces little to no gas and, therefore, should exhibit much lower flame propagation rates. Results show flame propagation rates ranged between 200 m/s and 600 m/s and peak pressures ranged between 1.7 MPa and 3.7 MPa for both composites. These results were significantly higher than expected for the Al+NiO, which generates virtually no gas. For nanometric Al particles, oxidation has recently been described by a melt-dispersion oxidation mechanism that involves a dispersion of high velocity alumina shell fragments and molten Al droplets that promote a pressure build-up by inducing a bulk movement of fluid. This mechanism unique to nanoparticle reaction may promote convection without the need for additional gas generation. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]