Abstract
We present a simulation study on the formation of particle arches supported by flying buttresses that arrest the flow of monodisperse spherical particles through two adjacent slots (rectangular outlets) in a three-dimensional (3D) anisometric flat-bottomed silo discharging under gravity. Most previous experimental and simulation studies on the jamming of a silo have focused on a single outlet, and have shown that the mean number of particles exiting the silo before it jams depends on the ratio of outlet size to particle diameter (\(R\)). In this paper, we look at the nature of jamming if there are two adjacent outlets and discover some new physical insights on how sand arches are mechanically supported and how they interact with each other. For a fixed slot width \(D_{o}\) and particle diameter \(d\), the distance separating the two openings \(D_{w}\) is varied. The distribution of \(N\) particles exiting the silo before both slots are jammed is obtained for each \(D_{w}\). From these distributions, we show that as \(D_{w}\) becomes less than approximately \(3d\), the particle arches on adjacent outlets start affecting each other, and mutually stable arches become harder to form. We show that in cases, where for a small orifice ratio \(R={D_o}/d\) a single outlet would have easily jammed, two adjacent outlets do not jam. We propose that this is due to the importance of stable particles resting on the base of the silo adjacent to the arches, which redistribute the load much like a flying buttress does in Gothic arches.
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Abbreviations
- \(d\) :
-
Particle diameter, L, m (\(\,\upmu \hbox {m}\))
- \(D_{o}\) :
-
Outlet size, L, m (\(\,\upmu \hbox {m}\))
- \(D_{w}\) :
-
Wire-width or distance between adjacent outlets, L, m (\(\,\upmu \hbox {m}\))
- \(e\) :
-
Dimensionless coefficient of restitution
- \(E\) :
-
Young’s modulus, \(\hbox {ML}^{-1}\, \hbox {T}^{-2}\), Pa (psi)
- \(f_{D_{w,R}}(N)\) :
-
Normalized frequency distribution of avalanche size
- \(N\) :
-
Avalanche size
- \(\left\langle N \right\rangle \) :
-
Mean avalanche size
- \(R\) :
-
Dimensionless outlet-to-particle size ratio
- \(R^{*}\) :
-
Critial \(R\) above which no jamming
- \(S\) :
-
Dimensionless wire-width-to-particle size ratio
- \(S^{*}\) :
-
Critial \(S\) below which adjacent outlets interact
- \(\mu \) :
-
Friction coefficient
- \(\mu _r\) :
-
Rolling-friction coefficient
- \(\nu \) :
-
Poisson’s ratio
- \(\phi \) :
-
Density, \(\hbox {ML}^{-3}, \hbox {kg/m}^{3}\)
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Acknowledgments
We wish to acknowledge the Texas Advanced Computing Center (TACC) at the University of Texas at Austin for providing HPC resources for this research.
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Mondal, S., Sharma, M.M. Role of flying buttresses in the jamming of granular matter through multiple rectangular outlets. Granular Matter 16, 125–132 (2014). https://doi.org/10.1007/s10035-013-0461-5
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DOI: https://doi.org/10.1007/s10035-013-0461-5