Hot spot formation from shock reflections |
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Authors: | R Menikoff |
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Institution: | (1) Applied Research Associates Inc., 4300 San Mateo Blvd, Ste A-220, Albuquerque, NM 87110, USA |
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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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