Inter-orifice distance dependence of flow rate in a quasi-two-dimensional hopper with dual outlets

Cheng, Xu; Wang, Fei-Liang; Wang, Lipeng; Qi, Xiao-Shuang; Shi, Quan; Li, Liangsheng; Zheng, Ning

doi:10.1016/j.powtec.2018.01.019

Cited by 14 publications

(12 citation statements)

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“…placed far apart) was equal to two times the flow rate of a single opening. Xu et al [38] performed silo drainage experiments with steel spheres and also found similar monotonic decreasing flow rate behaviour. However, their silo was only quasi-three dimensional (the depth was of the order of a single particle diameter), they had only one opening separation distance L smaller than the particle diameter and steel has a relatively small friction coefficient compared with many other granular materials such as grains, seeds or sand.…”

Section: Introductionmentioning

confidence: 72%

“…In this work, we have combined imaging (PIV) and flow rate experiments with DEM to study the effect of opening separation distance in a rectangular silo with two symmetrically placed openings. In particular, we aimed to solve the discrepancy in the literature between DEM and experimental work in silos [37,38], where the flow rate decreased monotonically with opening separation distance, L, and pedestrian dynamics results [40], which had a local minimum flow rate behaviour.…”

Section: Discussionmentioning

confidence: 99%

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The dynamics of granular flow from a silo with two symmetric openings

et al. 2019

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The dynamics of granular flow in a rectangular silo with two symmetrically placed exit openings is investigated using particle image velocimetry (PIV), flow rate measurements and discrete element modelling (DEM). The flow of mustard seeds in a Perspex silo is recorded using a high-speed camera and the resulting image frames are analysed using PIV to obtain velocity, velocity divergence and shear rate plots. A change in flow structure is observed as the distance L between the two openings is varied. The mass flow rate is shown to be at a maximum at zero opening separation, decreasing as L is increased; it then reaches a minimum before rising to an equilibrium rate close to two times that of an isolated (non-interacting) opening. The flow rate experiment is repeated using amaranth and screened sand and similar behaviour is observed. Although this result is in contrast with some recent DEM and physical experiments in silo systems, this effect has been reported in an analogous system: the evacuation of pedestrians from a room through two doors. Our experimental results are replicated using DEM and we show that inter-particle friction controls the flow rate behaviour and explains the discrepancies in the literature results.

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