Interaction of a planar shock with a dense field of particles

Wagner, Justin L.; Beresh, Steven J.; Kearney, Sean P.; Trott, Wayne M.; Castañeda, Jaime N.; Pruett, Brian Owen Matthew; Baer, M.R.

doi:10.1063/1.3686604

Cited by 3 publications

(10 citation statements)

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“…This thesis reports on shock tube experiments investigating the acceleration and dispersion of 100 micron-sized aluminum oxide particles [5]. By pure coincidence the experimental conditions are very similar to those of the Wagner et al [12] experiment, i.e., similar shock tube cross-section dimensions, shock wave strength, and particle size. The main difference between the experiments is in the initial particle cloud volume density.…”

Section: Introductionmentioning

confidence: 64%

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Dense particle cloud dispersion by a shock wave

et al. 2013

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High-speed particle dispersion research is motivated by the energy release enhancement of explosives containing solid particles. In the initial explosive dispersal, a dense gas-solid flow can exist where the physics of phase interactions are not well understood. A dense particle flow is generated by the interaction of a shock wave with an initially stationary packed granular bed. The initial packed granular bed is produced by compressing loose aluminum oxide powder into a 6.35 mm thick wafer with a particle volume fraction of 0.48. The wafer is positioned inside the shock tube, uniformly filling the entire cross-section. This results in a clean experiment where no flow obstructing support structures are present. Through high-speed shadowgraph imaging and pressure measurements along the length of the channel, detailed information about the particleshock interaction was obtained. Due to the limited strength of the Mach 2 incident shock wave, no transmitted shock wave is produced. The initial "solid-like" response of the particle wafer acceleration forms a series of compression waves that coalesce to form a shock wave. Breakup is initiated along the periphery of the wafer as the result of shear that forms due to the fixed boundary condition. Particle break-up starts at local failure sites that result in the formation of particle jets that extend ahead of the accelerating, largely intact, wafer core. In a circular tube the failure sites are uniformly distributed along the wafer circumference. In a square channel, the failure sites, and the subsequent particle jets, initially form at the corners due to the enhanced shear. The wafer breakup subsequently spreads to the edges forming a highly non-uniform particle cloud.

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Section: Introductionmentioning

confidence: 64%

“…Similarly, Anilkumar [11] used a vertical tube and a lofting method to introduce particles. Recently, shock tube experiments were carried out by Wagner et al [12] looking at the interaction of a shock wave and a gravity-fed particle "curtain".…”

Section: Introductionmentioning

confidence: 99%

Dense particle cloud dispersion by a shock wave

et al. 2013

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“…, MVN (53) where μλ and Σλ are the prior mean vector and the covariance matrix for the distribution. Similarly, the conjugate prior distribution for σ 2 (55) where ασ, βσ, αβ, ββ are the prior parameters of the respective distributions. The parameters θ are embedded in the correlation matrix, R, and there is no known conjugate distribution type that may be used as prior distributions.…”

Section: Modified Bayesian Kriging For Construction Of Surrogate Modelsmentioning

confidence: 99%

“…A wide variety of problems with distinct meso-and macroscales appear in several important engineering applications. Examples of typical multiscale problems are the dynamics of particleladen gases [1,2], deformation of heterogeneous materials such as bones [3][4][5], concrete [6,7], heterogeneous explosives [8][9][10][11], sediment transport in river beds [12], and meso-scale models of blood flow [13]. In such problems, macroscale computations typically resolve a limited range of length and time scales.…”

Section: Introductionmentioning

confidence: 99%

“…Multiscale modeling of multiphase flows involving fluid-solid interactions occur in many practical applications like dusty gases [1][2][3][4][5], fluidized beds [6][7][8][9], blood flows [10][11][12][13], sediment transport [14][15][16] etc. In such flows, velocity fluctuations arising because of the interaction between the solid and the fluid phases play significant roles in gas-particle heat transfer [17][18][19][20], mixing of species [21][22][23] etc.…”

Section: Introductionmentioning

confidence: 99%

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