Abstract
Heterogeneities sensitize an explosive to shock initiation. This is due to hot-spot formation and the sensitivity of chemical reaction rates to temperature. Here, we describe a numerical experiment aimed at elucidating a mechanism for hot-spot formation that occurs when a shock wave passes over a high-density impurity. The simulation performed is motivated by a physical experiment in which glass beads are added to liquid nitromethane. The impedance mismatch between the beads and the nitromethane results in shock reflections. These, in turn, give rise to transverse waves along the lead shock front. Hot spots arise on local portions of the lead front with a higher shock strength, rather than on the reflected shocks behind the beads. Moreover, the interactions generated by reflected waves from neighboring beads can significantly increase the peak hot-spot temperature when the beads are suitably spaced.
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Blais N.C., Engelke R., Sheffield S.A.: Mass spectoscopic study of the chemical reaction zone in detonating liquid nitromethane. J. Phys. Chem. A 101, 8285–8295 (1997)
Dattelbaum, D.M., Sheffield, S.A., Stahl, D.B., Dattelbaum, A.M., Trott, W., Engelke, R.: Influence of hot spot features on the initiation characteristics of heterogeneous nitromethane. In: Fourteenth Symposium (International) on Detonation (2010)
Engelke R.: Effect of a chemical inhomogeneity on steady-state detonation velocity. Phys. Fluids 23, 875–880 (1980)
Engelke R., Earl W.L., Rohlfing M.: Microscopic evidence that the nitromethane aci ion is rate controlling species in the detonation of liquid nitromethane. J. Chem. Phys. 84, 142–146 (1986)
Engelke R., Sheffield S.A., Stacy H.L.: Effect of deuteration on the diameter-effect curve of liquid nitromethane. J. Phys. Chem. A 110, 7744–7748 (2006)
Field J.E., Bourne N.K., Palmer S.J.P., Walley S.M.: Hot-spot ignition mechanisms for explosives and propellants. Phil. Trans. R. Soc. Lond. A 339, 269–283 (1992)
Henderson L.F., Menikoff R.: Triple-shock entropy theorem and its consequences. J. Fluid Mech. 366, 179–210 (1998)
Holian, K.S.: T-4 Handbook of material property data bases. Vol. Ic equations of state. Technical Report LA-10160-MS, Los Alamos National Lab (1984)
Karpenko I.I., Morozov V.G., Chernysheva O.N., Yanilkin Y.V.: Calculations of rate of growth of hot spots during detonation taking into account the turbulent mechanism of energy transfer. Russ. J. Phys. Chem. B 2, 157–161 (2008)
Mader C.L.: Numerical Modeling of Explosives and Propellants, 3rd edn. CRC Press, Boca Raton (2008)
Marsh, S.P. (ed.): LASL Shock Hugoniot Data. University of California Press, Berkeley (1980)
Menikoff, R.: Pore collapse and hot spots in HMX. In: Shock Compression of Condensed Matter 2003, pp. 393–396 (2004)
Menikoff, R.: Empirical equations of state for solids. In: Y. Horie (ed.) Solids I. Shock Wave Science and Technology Reference Library, vol. 2, Chap. 4. Springer-Verlag, Berlin (2007)
Menikoff, R.: On beyond the standard model for high explosives: challenges & obstacles to surmount. In: Shock Compression of Condensed Matter 2009, pp. 18–25 (2009)
Menikoff, R., Shaw, M.S.: Modeling detonation waves in nitromethane. (2010, in preparation)
Radulescu M.I., Sharpe G.J., Law C.K., Lee J.H.S.: The hydrodynamic structure of unstable cellular detonations. J. Fluid Mech. 580, 31–81 (2007)
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Communicated by B. W. Skews.
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Menikoff, R. Hot spot formation from shock reflections. Shock Waves 21, 141–148 (2011). https://doi.org/10.1007/s00193-011-0303-5
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DOI: https://doi.org/10.1007/s00193-011-0303-5