01584nas a2200181   4500008004100000022001400041245008500055210006900140260007900209300001100288490000700299520091600306100002001222700001601242700001801258700002101276856010501297       2014                        eng d  a1539-375500aFlow of granular matter in a silo with multiple exit orifices: jamming to mixing0 aFlow of granular matter in a silo with multiple exit orifices ja  aONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USAbAMER PHYSICAL SOCcDEC  a0622060 v903 a<p>We investigate the mixing characteristics of dry granular material while draining down a silo with multiple exit orifices. The mixing in the silo, which otherwise consists of noninteracting stagnant and flowing regions, is observed to improve significantly when the flow through specific orifices is stopped intermittently. This momentary stoppage of flow through the orifice is either controlled manually or is chosen by the system itself when the orifice width is small enough to cause spontaneous jamming and unjamming. We observe that the overall mixing behavior shows a systematic dependence on the frequency of closing and opening of specific orifices. In particular, the silo configuration employing random jamming and unjamming of any of the orifices shows early evidence of chaotic mixing. When operated in a multipass mode, the system exhibits a practical and efficient way of mixing particles.</p>1 aKamath, Sandesh1 aKunte, Amit1 aDoshi, Pankaj1 aOrpe, Ashish, V.  uhttps://library.ncl.res.in/content/flow-granular-matter-silo-multiple-exit-orifices-jamming-mixing-001465nas a2200169   4500008004100000022001400041245007800055210006900133260007900202300001100281490000700292520083600299100001601135700001801151700002101169856010501190       2014                        eng d  a1539-375500aSpontaneous jamming and unjamming in a hopper with multiple exit orifices0 aSpontaneous jamming and unjamming in a hopper with multiple exit  aONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USAbAMER PHYSICAL SOCcAUG  a0202010 v903 a<p>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.</p>1 aKunte, Amit1 aDoshi, Pankaj1 aOrpe, Ashish, V.  uhttps://library.ncl.res.in/content/spontaneous-jamming-and-unjamming-hopper-multiple-exit-orifices-0