论文标题
通过偏心孔位置排放的颗粒混合物
Granular mixtures discharging through a silo with eccentric orifice location
论文作者
论文摘要
我们使用离散元素方法（DEM）研究了两个孤岛病例的哑铃和圆盘混合物的流动动力学：1。位于侧壁上的孔口和2个。将多个孔放在二维筒仓的底部上。在上述情况下，列出了各种参数的时间平均流场，例如速度，面积分数，压力，剪切应力等。据报道，通过横向孔排出的流量进行了修改的贝弗鲁缩放。发现动态摩擦会随着哑铃的增加而增加。这导致通过增加哑铃的横向孔口的流速降低。对于所研究的整个侧孔宽度范围的混合物，观察到自相似的速度曲线。对于多孔口案例，流速随着距离间距离L/D的增加而降低。速度曲线和流场揭示了两个孔口之间的相互作用区域，当孔口宽时几乎不存在。该相互作用区域或流经孔口受相邻孔口的影响是高于每个孔的速度较高速度的原因，从而导致较小的流速在小L/d时的流速较高。发现孔之间的停滞区域随着距离间距离的增加而扩展，这会增加每个孔和停滞区之间的剪切应力的增加。
We used the discrete element method (DEM) to study the flow dynamics of a mixture of dumbbells and discs for two silo cases: 1. orifice situated on the lateral wall and 2. multiple orifices placed on the base of a two-dimensional silo. The time-averaged flow fields of various parameters like velocity, area fraction, pressure, shear stress etc, obtained from coarse-graining technique are presented for both the above-mentioned cases. A modified Beverloo scaling is reported for the flow discharging through the lateral orifice. The dynamic friction is found to increase with an increase in the addition of dumbbells. This resulted in a decrease in the flow rate through a lateral orifice with the addition of dumbbells. Self-similar velocity profiles are observed for mixtures for the whole range of lateral orifice widths studied. The flow rate decreases with an increase in the inter-orifice distance L/d for the multiple orifice case. The velocity profile and flow fields revealed an interaction zone between the two orifices at small L/d which is almost absent when the orifices are wide apart. This interaction zone or flow through an orifice influenced by the presence of an adjacent orifice is the reason for a higher velocity above each of the orifices thus resulting in a higher flow rate at small L/d. The stagnant zone between the orifices is found to expand with an increase in the inter-orifice distance which yields in an increase in the shear stress between each of the orifices and the stagnant zone.
