Explosive dispersal of solid particles

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Authors
  1. Zhang, F.
  2. Frost,, D.L.
  3. Thibault, P.A.
  4. Murray, S.B.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
The rapid dispersal of inert solid particles due to the detonation of a heterogeneous explosive, consisting of a packed bed of steel beads saturated with a liquid explosive, has been investigated experimentally and numerically. Detonation of the spherical charge generates a blast wave followed by a complex supersonic gas-solid flow in which, in some cases, the bends catch up to and penetate the leading shock front. The interplay between the particle dynamics and the blast wave propagation was investigated experimentally as a function of the particle size (100-925 mu m) and charge diameter (8.9-21.2 cm) with flash X-ray radiography and blast wave instrumentation. The flow topology during the dispersal process ranges from a dense granualr flow to a dilute gas-solid flow. Difficulties in the modeling of the high-speed gas-solid flow are discussed, and a heuristic model for the equation of state for the solid flow is developed. This model is incorporated into the Eulerian two-phase fluid model of Baer and Nunziato (1986) and simulations are carried out. The results of htis investigation indicate that the crossing of the particles through the shock front strongly depends on the charge geometry, the charge size and the material density of the particles. Moreover, there exists a particle size limit below which the particles cannot penetrate the shock for the range of charge sizes considered.
Keywords
MPFD (Multiphase fluid dynamic model);Multiphase;Heterogeneous explosive;Multi-phase gas-solid flow
Report Number
DRES-SL-2000-130;DRDC-SUFFIELD-SL-2000-130 — Reprint
Date of publication
26 Jun 2001
Number of Pages
13
Reprinted from
Shock Waves, vol 10, 2001, p 431-443
DSTKIM No
CA010722
CANDIS No
515466
Format(s):
Hardcopy;Document Image stored on Optical Disk

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