Impact dynamics of granular jets with noncircular cross sections

Cheng, Xiang; Gordillo, Leonardo; Zhang, Wendy W.; Jaeger, Heinrich M.; Nagel, Sidney R.

doi:10.1103/physreve.89.042201

Cited by 18 publications

(11 citation statements)

References 34 publications

(72 reference statements)

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“…Furthermore, when investigating the impact between two free streams or objects, it is natural to simplify the dynamics by fixing the first object and then collide the second against the first. Examples where this has has been done when studying the off-center collision of granular streams [27] or the formation of protoplanets [32][33][34]. However, because of the presence of central drift in dense, dissipative impacts, the outcome of collisions when fixing one object is fundamentally different than the free-collision counterpart.…”

Section: Discussionmentioning

confidence: 99%

“…Comoving reference frame The collision produces some familiar behavior, namely that two collimated ejecta streams are produced as in the case of impact against a fixed target [7,11,12,27]. The collimated ejecta are traveling with velocity U out at an angle Ψ 0 relative to the horizontal.…”

Section: A Steady Saddle Driftmentioning

confidence: 99%

“…This becomes, noting fluid incompressibility, (27) Using dimensional analysis we can approximateĒ diss from Eq. (27) as…”

Section: Control Volume Analysismentioning

confidence: 99%

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Head-on collisions of dense granular jets

Ellowitz

2016

Phys. Rev. E

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We study head-on impacts of equal-speed but unequal-width incompressible jets in two dimensions with a focus on dense granular jets. We use discrete particle simulations to show that head-on impact of granular jets produces a quasi-steady-state where a fraction of the excess incident momentum from the larger jet is captured by an impact center that drifts steadily over time. By varying the dissipation in our discrete particle simulations and through additional analogous continuum jet impacts of different rheologies, we show that this central drift speed is remarkably dependent primarily on the total dissipation rate to the power 1.5, and largely independent of the dissipation mechanism. We finish by presenting a simple control volume analysis that qualitatively captures the emergence of the drift speed but not the scaling.

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Section: Discussionmentioning

confidence: 99%

Section: A Steady Saddle Driftmentioning

confidence: 99%

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Head-on collisions of dense granular jets

Ellowitz

2016

Phys. Rev. E

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“…Ellowitz investigated the head‐on impingement of dense granular jets with unequal‐width by discrete particle simulations, and the shift of impact stagnation point was revealed due to the dissipation. Note that the particle behaviors of a dense granular jet impacting on a solid target were experimentally studied by Cheng et al They found that as the number of particles in the jet decreases, a liquid‐like granular sheet changes to a diffuse pattern due to rapid interparticle collisions during impact of the target. Their results also imply that the impingement of two dense granular jets may give rise to the granular sheet, but detailed experimental result has not been presented and collision‐level information is not clear yet.…”

Section: Introductionmentioning

confidence: 99%

Study on Liquid‐Like Behaviors of Dense Granular Impinging Jets

Shi

Wang

et al. 2018

AIChE Journal

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Particle dynamic behaviors of dense granular impinging jets are experimentally studied by a high-speed camera and numerically simulated using discrete element method (DEM). Effects of the granular jet velocity, impinging angle, and solid fraction of the granular jet on the flow patterns and interparticle collision are investigated. Results show that as the solid fraction of the granular jet (x p ) increases, three patterns, that is, the penetrating pattern, diffuse pattern, and thin, liquidlike granular sheet display in turns. The shape and velocity of the granular sheet have been characterized and compared with the liquid sheet. An increase in the impinging angle obviously enlarges the granular sheet and decreases the sheet velocity. The flow patterns and sheet velocity are successfully predicted by DEM simulation. The simulation results further reveal that rising x p increases the interparticle collision frequencies, which decreases interparticle collision forces and relative velocities, and consequently gives rise to the granular sheet.

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“…The second similarity concerns the interaction of a granular jet with a solid obstacle, e.g. 7 8 9 10 11 12 where granular sheets or cone-like structures emerge. This behavior corresponds to Savart water bells observed for fluid jets 13 14 .…”

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confidence: 99%

Subharmonic instability of a self-organized granular jet

Kollmer

Pöschel

2016

Sci Rep

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Downhill flows of granular matter colliding in the lowest point of a valley, may induce a self-organized jet. By means of a quasi two-dimensional experiment where fine grained sand flows in a vertically sinusoidally agitated cylinder, we show that the emergent jet, that is, a sheet of ejecta, does not follow the frequency of agitation but reveals subharmonic response. The order of the subharmonics is a complex function of the parameters of driving.

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Impact dynamics of granular jets with noncircular cross sections

Cited by 18 publications

References 34 publications

Head-on collisions of dense granular jets

Head-on collisions of dense granular jets

Study on Liquid‐Like Behaviors of Dense Granular Impinging Jets

Subharmonic instability of a self-organized granular jet

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