Numerical modelling of the entrainment of particles in inviscid supersonic flow

Zarei, Z.; Frost, David L.; Timofeev, E.

doi:10.1007/s00193-011-0311-5

Cited by 12 publications

(3 citation statements)

References 16 publications

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“…Details of F L require further refinement, but it is theorized to be dependent on solid material properties and particle morphology. The later particle interaction dynamics occur when the flow becomes dilute, and include particle entrainment and proximal flow [5][6]. Pressure gradients and aerodynamic drag provide sufficient force to maintain the coherent jet structures.…”

Section: Simulation Resultsmentioning

confidence: 99%

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Jetting instabilities of particles from explosive dispersal

Ripley¹,

Donahue²,

Zhang³

2012

AIP Conference Proceedings

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Abstract. The formation of post-detonation 'particle' jets is widely observed in many problems associated with particle dispersal from explosives. This paper analyzes experimental observations to examine the mechanism for formation and growth of such particle jetting instabilities, and to propose a model to address the issues of jetting growth at a macroscopic level. The experiments involve cylindrical charges with a range of central explosive masses for dispersal of dry solid powder, pure liquid, or a hybrid mixture of solid powder and liquid. The results demonstrate that the jets form very early, and that the number of jets is dependent on shock pressure at the charge perimeter, within the range of particle sizes studied. The jetting instabilities may therefore be initiated by shock interaction with the dense solid particle interfaces near the charge surface, followed by early jet growth through transverse particle motion from the interaction of shocked and turbulent wake flow around the particles. From the experiments, a macroscopic model is proposed, in which an edge perturbation on a scale proportional to the number of jets as a function of shock pressure is employed, and the subsequent transverse particle motion is controlled by an attraction function. The model is implemented in the Chinook hydrocode, which is capable of modeling the initiation and growth of particle jetting structures in large-scale dispersal, and the results are validated against experiments.

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Section: Simulation Resultsmentioning

confidence: 99%

“…For liquid dispersal, the number of jets decreases due to aerodynamic breakup and evaporation. In the case of powder, the number of jets decreases because of the transverse motion of particles, such as in proximal flow of supersonic bodies [5][6]. Figure 3 gives the number of jets for hybrid dispersal.…”

Section: Number Of Jet Structuresmentioning

confidence: 99%

Jetting instabilities of particles from explosive dispersal

Ripley¹,

Donahue²,

Zhang³

2012

AIP Conference Proceedings

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“…In compressible dense gas-particle flows, the interparticle interactions and the interactions between particles and the reflected or diffracted waves from neighboring particles become important [10][11][12][13]. Li et al [14] calculated the drag force in a dense gas-particle flow.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Zhang

et al. 2021

Shock and Vibration

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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.

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