摘要
通过引入液桥力模型,结合离散颗粒法(DEM),数值模拟了料仓中湿颗粒的流动,研究了液桥力对料仓内颗粒质量流率的影响.结果表明:对于干颗粒,满足不结拱的料仓开口度尺寸至少为颗粒直径的3倍,而湿颗粒则要求料仓开口度至少为颗粒直径的4倍;干颗粒由漏斗流向整体流转换的角度在45°左右,而湿颗粒的转换角度为40°左右.研究还发现液桥力对于小粒径颗粒的影响明显大于大粒径颗粒.在相同含水量的情况下,小颗粒更容易出现团聚,而不易分离.
With the aid of liquid bridge model, DEM(Discrete Element Method) and mathematical models, this paper simulates the flow of wet particles in a hopper to study the influence of liquid bridge on the flow patterns and flow rate. The research results show that usually the critical open diameter of a hopper for dry particles is more than 3 times of particle diameter, but no less than 4 times for wet particles. For dry particles, the hopper angle which causes transformation from funnel flow into mass flow is about 45°, while for wet particles it is about 40°. Moreover the effect of liquid bridge on small particles is more obvious than on big particles. With the same water content small particles are easier to aggregate than big particles.
出处
《海南大学学报（自然科学版）》
CAS
2004年第1期23-27,共5页
Natural Science Journal of Hainan University
