Kunte Amit, Doshi Pankaj, Orpe Ashish V
Chemical Engineering Division, National Chemical Laboratory, Pune 411008, India.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Aug;90(2):020201. doi: 10.1103/PhysRevE.90.020201. Epub 2014 Aug 20.
We show that the flow of granular material inside a two-dimensional flat bottomed hopper is altered significantly by having more than one exit orifice. For hoppers with small orifice widths, intermittent flow through one orifice enables the resumption of flow through the adjacent jammed orifice, thus displaying a sequence of jamming and unjamming events. Using discrete element simulations, we show that the total amount of granular material (i.e., avalanche size) emanating from all the orifices combined can be enhanced by about an order of magnitude difference by simply adjusting the interorifice distance. The unjamming is driven primarily by fluctuations alone when the interorifice distance is large, but when the orifices are brought close enough, the fluctuations along with the mean flow cause the flow to unjam.
我们表明，二维平底料斗内颗粒材料的流动会因有多个出料口而发生显著变化。对于出料口宽度较小的料斗，通过一个出料口的间歇流动能使相邻堵塞出料口恢复流动，从而呈现出一系列堵塞和疏通事件。通过离散元模拟，我们表明，只需调整出料口间距，所有出料口组合产生的颗粒材料总量（即雪崩规模）就能提高约一个数量级。当出料口间距较大时，疏通主要仅由波动驱动，但当出料口足够靠近时，波动与平均流一起会使流动得以疏通。
