Initial Moving Mechanism of Densely-Packed Particles Driven by a Planar Shock Wave

The initial moving mechanism of densely packed particles driven by shock waves is unclear but vital for the next accurate calculation of the problem. Here, the initial motion details are investigated experimentally and numerically. We found that before particles show notable motion, shock waves comp...

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Bibliographic Details
Published inShock and vibration Vol. 2021; no. 1
Main Authors Lv, Hua, Wang, Zhongqi, Zhang, Yunming, Li, Jianping
Format Journal Article
LanguageEnglish
Published Cairo Hindawi 2021
John Wiley & Sons, Inc
Hindawi Limited
Subjects
Axial stress
Experiments
Gas fields
Gas flow
Shock waves
Simulation
Stress waves
Velocity
Wave propagation
Wave reflection
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Summary:The initial moving mechanism of densely packed particles driven by shock waves is unclear but vital for the next accurate calculation of the problem. Here, the initial motion details are investigated experimentally and numerically. We found that before particles show notable motion, shock waves complete reflection and transmission, and stress waves propagate downstream on particle skeleton. Due to the particle stress wave, particles successively accelerate and obtain an axial velocity of 6–8 m/s. Then, the blocked gas pushes the upstream particles integrally to move downstream, while the gas flow in the pores drags the downstream particles to separate dramatically and accelerate to the velocity of 60–70 m/s. This gas push-drag dual mechanism transforms densely packed particles into a dense gas-particle cloud, which behaves as the expansion phenomena of the dense particles.
ISSN:1070-9622
1875-9203
DOI:10.1155/2021/8867615