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- W2755874537 abstract "When grains flow out of a silo, flow rate $W$ increases with exit size $D$. If $D$ is too small, an arch may form and the flow may be blocked at the exit. To recover from clogging, the arch has to be destroyed. Here we construct a two-dimensional silo with movable exit and study the effects of exit oscillation (with amplitude $A$ and frequency $f$) on flow rate, clogging, and unclogging of grains through the exit. We find that, if exit oscillates, $W$ remains finite even when $D$ (measured in unit of grain diameter) is only slightly larger than one. Surprisingly, while $W$ increases with oscillation strength $mathrm{ensuremath{Gamma}}ensuremath{equiv}4{ensuremath{pi}}^{2}A{f}^{2}$ as expected at small $D$, $W$ decreases with $mathrm{ensuremath{Gamma}}$ when $Densuremath{ge}5$ due to induced random motion of the grains at the exit. When $D$ is small and oscillation speed $vensuremath{equiv}2ensuremath{pi}Af$ is slow, temporary clogging events cause the grains to flow intermittently. In this regime, $W$ depends only on $v$---a feature consistent to a simple arch breaking mechanism, and the phase boundary of intermittent flow in the $Dtext{ensuremath{-}}v$ plane is consistent to either a power law: $Densuremath{propto}{v}^{ensuremath{-}7}$ or an exponential form: $Densuremath{propto}{e}^{ensuremath{-}D/0.55}$. Furthermore, the flow time statistic is Poissonian whereas the recovery time statistic follows a power-law distribution." @default.
- W2755874537 created "2017-09-25" @default.
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- W2755874537 creator A5090695482 @default.
- W2755874537 date "2017-09-14" @default.
- W2755874537 modified "2023-09-24" @default.
- W2755874537 title "Flow and clog in a silo with oscillating exit" @default.
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- W2755874537 doi "https://doi.org/10.1103/physreve.96.032906" @default.
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