Influence of an inserted bar on the flow regimes in the hopper  

作　　者：Yi Peng Sheng Zhang Mengke Wang Guanghui Yang Jiangfeng Wan Liangwen Chen Lei Yang 彭毅;张晟;王梦柯;杨光辉;万江锋;陈良文;杨磊(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;East China University of Technology,Nanchang 330000,China)

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]East China University of Technology,Nanchang 330000,China

出　　处：《Chinese Physics B》2021年第2期535-539,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11705256 and 11905272);National Postdoctoral Program for Innovative Talents,China(Grant No.BX201700258);West Light Foundation of the Chinese Academy of Sciences(Grant No.2018-98)。

摘　　要：We investigated the influence of an inserted bar on the hopper flow experimentally.Three geometrical parameters,size of upper outlet D1,size of lower outlet D0,and the height of bar H,are variables here.With varying H we found three regimes:one transition from clogging to a surface flow and another transition from a surface flow to a dense flow.For the dense flow,the flow rate follows Beverloo’s law and there is a saturation of inclination of free surfaceθ.We plotted the velocity field and there is a uniform linear relation between the particle velocity and depth from the free surface.We also found that the required value of D_(1) to guarantee the connectivity of flow is little smaller than D_(0).For the transition from a surface flow to a dense flow,there is a jump of flow rate and the minimumθfor flowing is two degrees larger than the repose angle.

关 键 词：hopper flow inserted bar flow type transition free surface velocity distribution 

分 类 号：O35[理学—流体力学]