Granular jet impact: probing the ideal fluid description

Müller, Patric; Formella, Arno; Pöschel, Thorsten

doi:10.1017/jfm.2014.210

Cited by 16 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4), while the formula (6) deviates from the simulation results when V * ≡ V m/k n /d is larger than 0.3. This result is interesting because the perfect fluidity observed in granular jets or granular fluids (Cheng et al 2007;Ellowitz et al 2013;Müller et al 2014;Blumenfeld et al 2010) is quantitatively verified in our setup, at least, for relatively slow flows and moderate dense granular medium. We should note that our problem can be converted into a jet problem for a circular target, if we use the frame of the stationary tracer.…”

Section: System Without Dry Frictionsupporting

confidence: 73%

Drag Law of Two-Dimensional Granular Fluids

Takada

Hayakawa

2017

J. Eng. Mech.

View full text Add to dashboard Cite

The drag force law acting on a moving circular disk in a two-dimensional granular medium is analyzed based on the discrete element method (DEM). It is remarkable that the drag force on the moving disk in moderate dense and pure two-dimensional granular medium can be well reproduced by a perfect fluid with separation from the surface of the tracer. A yield force, being independent of the moving speed of the disk, appears if a dry friction between the granular disks and the bottom plate exists. The perfect fluidity is violated in this case. The yield force and the drag force diverge at the jamming point.

show abstract

Section: System Without Dry Frictionsupporting

confidence: 73%

Drag Law of Two-Dimensional Granular Fluids

Takada

Hayakawa

2017

J. Eng. Mech.

View full text Add to dashboard Cite

show abstract

“…Considering the fact that the particle is about 2000 times the momentum of air at identical velocity in atmospheric pressure, and the gas may be neglected for dense granular impinging jets. This strategy used was the same to several previous DEM works on granular jets impinging on a solid target …”

Section: Resultsmentioning

confidence: 99%

Study on Liquid‐Like Behaviors of Dense Granular Impinging Jets

Shi

Wang

et al. 2018

AIChE Journal

View full text Add to dashboard Cite

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.

show abstract

“…Regarding impacts against fixed targets, previous workers showed granular and high speed liquid jets astoundingly both produce quite similar coherent ejecta sheets [5][6][7]. Because the flow from a high speed liquid impinging a fixed target is similar to a perfect fluid, this led to a discussion of whether or not a granular jet impact against a target behaves like a perfect fluid [7][8][9][10][11]. Despite the similar ejecta from the target impacts, it was later shown that granular jet impact against a target produces a large, stagnant dead-zone, and that furthermore inserting large dead-zone-like structures into perfect fluids barely affected the ejecta [12].…”

Section: Introductionmentioning

confidence: 99%

Head-on collisions of dense granular jets

Ellowitz

2016

Phys. Rev. E

View full text Add to dashboard Cite

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.

show abstract

Granular jet impact: probing the ideal fluid description

Cited by 16 publications

References 27 publications

Drag Law of Two-Dimensional Granular Fluids

Drag Law of Two-Dimensional Granular Fluids

Study on Liquid‐Like Behaviors of Dense Granular Impinging Jets

Head-on collisions of dense granular jets

Contact Info

Product

Resources

About