论文标题
在重力下排出筒仓的孔口影响区域的速度缩放
Velocity scaling in the region of orifice influence in silo draining under gravity
论文作者
论文摘要
这项研究利用基于软粒子离散元素方法的计算来研究重力下二维筒仓排排在二维筒仓中的尺度。我们专注于位于上方和靠近出口的区域，称为孔口影响区域（ROI）。出口尺度的出口尺寸的速度与先前的研究一致。但是，出口上游的ROI上游的速度在与出口尺寸缩放时不会塌陷到单个曲线。我们表明，可以使用$ \ textit {equi惯性} $曲线的高度，该曲线被定义为惯性数是恒定的曲线，可用于缩放ROI中的速度。相对于出口速度测量时，对应于等惯性曲线的速度被考虑用于缩放。结果表明，对于对应于密集流动状态的低惯性数，缩放率很高，而对于高惯性数区域而言，它会分解。
This study utilizes computations based on soft-particle discrete element method for investigating the scaling of velocity in a two-dimensional silo draining under gravity. We focus on the region situated directly above and in proximity to the outlet, referred to as the region of orifice influence (ROI). The velocity at the exit scales with the outlet size, in agreement with previous studies. The velocity in the ROI upstream of the outlet, however, does not collapse to a single curve when scaled with the outlet size. We show that the height of an $\textit{equi-inertial}$ curve, which is defined to be a curve on which the inertial number is constant, can be employed for scaling the velocity in the ROI. The velocity corresponding to an equi-inertial curve, when measured relative to the outlet velocity, is considered for scaling. Results show that the scaling holds very well for low inertial number corresponding to the dense flow regime, whereas it breaks down for high inertial number region.
