01464nas a2200169   4500008004100000022001400041245007800055210006900133260007900202300001100281490000700292520083600299100001601135700001801151700002101169856010401190       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.  uhttp://library.ncl.res.in/content/spontaneous-jamming-and-unjamming-hopper-multiple-exit-orifices-0