Shock wave diffraction by a square cavity filled with dusty gas

By, Wang; QS, Wu; C(王春), Wang; Igra, O.; Falcovitz, Joseph

doi:10.1007/pl00004061

Cited by 23 publications

(10 citation statements)

References 17 publications

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“…In the dusty regime, the effects of particle collisions are considered negligible (Rudinger 1980), and a relation exists for the particle drag coefficient (Igra and Ben-Dor 1988) that has been validated experimentally (Aizik et al 1995). Furthermore, simulations and theoretical analysis have been applied to predict shock attenuation (Rudinger and Chang 1964;Miura and Glass 1985;Wang et al 2001). For randomly packed particles, where u p is greater than about 50%, the flow regime is said to be granular.…”

Section: Introductionmentioning

confidence: 99%

A multiphase shock tube for shock wave interactions with dense particle fields

et al. 2012

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Currently there is a substantial lack of data for interactions of shock waves with particle fields having volume fractions residing between the dilute and granular regimes. To close this gap, a novel multiphase shock tube has been constructed to drive a planar shock wave into a dense gas-solid field of particles. A nearly spatially isotropic field of particles is generated in the test section by a gravity-fed method that results in a spanwise curtain of spherical 100-micron particles having a volume fraction of about 20%. Interactions with incident shock Mach numbers of 1.66, 1.92, and 2.02 are reported. High-speed schlieren imaging simultaneous with high-frequency wall pressure measurements are used to reveal the complex wave structure associated with the interaction. Following incident shock impingement, transmitted and reflected shocks are observed, which lead to differences in particle drag across the streamwise dimension of the curtain. Shortly thereafter, the particle field begins to propagate downstream and spread. For all three Mach numbers tested, the energy and momentum fluxes in the induced flow far downstream are reduced about 30-40% by the presence of the particle field.

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Section: Introductionmentioning

confidence: 99%

A multiphase shock tube for shock wave interactions with dense particle fields

et al. 2012

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“…In the dusty gas-solid flow regime, accepted expressions exist for the Nusselt number and the particle drag coefficient [3], which have been validated experimentally [4]. The expressions are used frequently in dilute gas flow simulations to model shock attenuation [5][6][7]. For gas-solid flows where the particles are randomly packed (φ p greater than about 50%) the flow regime is said to be "granular."…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental characterization of energetic material dynamics for multiphase blast simulation.

Beresh¹,

Wagner²,

Kearney³

et al. 2011

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Currently there is a substantial lack of data for interactions of shock waves with particle fields having volume fractions residing between the dilute and granular regimes, which creates one of the largest sources of uncertainty in the simulation of energetic material detonation. To close this gap, a novel Multiphase Shock Tube has been constructed to drive a planar shock wave into a dense gassolid field of particles. A nearly spatially isotropic field of particles is generated in the test section by a gravity-fed method that results in a spanwise curtain of spherical 100-micron particles having a volume fraction of about 19%. Interactions with incident shock Mach numbers of 1.66, 1.92, and 2.02 were achieved. High-speed schlieren imaging simultaneous with high-frequency wall pressure measurements are used to reveal the complex wave structure associated with the interaction. Following incident shock impingement, transmitted and reflected shocks are observed, which lead to differences in particle drag across the streamwise dimension of the curtain. Shortly thereafter, the particle field begins to propagate downstream and spread. For all three Mach numbers tested, the energy and momentum fluxes in the induced flow far downstream are reduced about 30-40% by the presence of the particle field. X-Ray diagnostics have been developed to penetrate the opacity of the flow, revealing the concentrations throughout the particle field as it expands and spreads downstream with time. Furthermore, an X-Ray particle tracking velocimetry diagnostic has been demonstrated to be feasible for this flow, which can be used to follow the trajectory of tracer particles seeded into the curtain. Additional experiments on single spherical particles accelerated behind an incident shock 4 wave have shown that elevated particle drag coefficients can be attributed to increased compressibility rather than flow unsteadiness, clarifying confusing results from the historical database of shock tube experiments. The development of the Multiphase Shock Tube and associated diagnostic capabilities offers experimental capability to a previously inaccessible regime, which can provide unprecedented data concerning particle dynamics of dense gas-solid flows. 5

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“…Wang et al [4] solved the problem of propagation of a plane SW above a square cavity filled by a motionless gas suspension numerically. They found that the shock waves in the cavity become attenuated with increasing load factor of particles and transform to compression waves.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of shock-wave diffraction in variable-section channels in gas suspensions

Федоров

Kratova

Khmel

2008

Combust Explos Shock Waves

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The problem of shock-wave transition past a backward-facing step in a gas suspension is solved. The calculation method is tested on a similar problem for a pure gas, and good agreement with available experimental and numerical results is reached. The effect of shock-wave intensity, mass load factor of particles in the mixture, and particle size on the flow structure in the gas suspension is determined. It is shown that the greatest difference between the flow pattern in a two-phase mixture and the corresponding flow in a pure gas is observed in the range of times when the characteristic sizes of the structures being formed are commensurable with the scale of the relaxation zones.

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Shock wave diffraction by a square cavity filled with dusty gas

Cited by 23 publications

References 17 publications

A multiphase shock tube for shock wave interactions with dense particle fields

A multiphase shock tube for shock wave interactions with dense particle fields

Experimental characterization of energetic material dynamics for multiphase blast simulation.

Numerical study of shock-wave diffraction in variable-section channels in gas suspensions

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