竖直振动激励下颗粒毛细上升行为研究  

Investigation of granular capillary rising under vertical vibration

作　　者：于天林 凡凤仙[1,2] Yu Tian-Lin;Fan Feng-Xian(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海理工大学上海市动力工程多相流动与传热重点实验室,上海200093

出　　处：《物理学报》2022年第10期201-208,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51976130);上海市科委科研计划(批准号:13DZ2260900)资助的课题。

摘　　要：竖直振动激励下颗粒毛细上升现象为颗粒物料的提升、输运和采集提供了一种全新的技术路径.然而,已有颗粒毛细上升行为研究仍存在明显不足,特别是缺乏对重力加速度、水平振动分量、颗粒粒径分布影响的深入探究.针对这些问题,采用离散元方法,对不同操作条件下颗粒毛细上升现象开展数值模拟研究,并对颗粒最终毛细上升高度和平均毛细上升速度进行计算分析.结果表明,在低重力条件下,颗粒毛细效应仍能发生,颗粒最终毛细上升高度和平均毛细上升速度随重力加速度均呈现先增加后减小的趋势;颗粒最终毛细上升高度对水平振动分量的变化不敏感,而平均毛细上升速度随水平振动分量的增大而增加;在平均粒径相等的情况下,粒径服从高斯分布的颗粒比单一粒径颗粒的最终毛细上升高度最大值对应的临界管径更大,并且同处于堵塞效应影响的管径区域时平均毛细上升速度也更快.The phenomenon of granular capillary rising under vertical vibration provides a novel technical route for hoisting,transporting and collecting granular materials.However,there are still obvious deficiencies in the existing studies of the granular capillary rising behavior,especially the intensive investigation on the effects of gravitational acceleration,horizontal vibration component and particle size distribution are still lacking.To address these problems,the discrete element method is used to numerically simulate the granular capillary rising phenomenon under different operating conditions.The final capillary rising height and average capillary rising velocity of the granular matter are computed and analyzed based on the numerical simulations.The results show that the granular capillarity can also occur under low gravity conditions,and that the final capillary rising height and the average capillary rising velocity first increase and then decrease with the gravitational acceleration.It is also found that the final capillary rising height is insensitive to the variation of horizontal vibrational component,whereas the average capillary rising velocity increases with the augmentation of horizontal vibrational component.Compared with the mono-sized particles,the particles with the same mean size but having a Gaussian size distribution exhibit a maximal capillary rising height at a larger critical tube diameter.Meanwhile,the average capillary rising velocity of the particles having a Gaussian size distribution is faster in the tube diameter range where the granular capillary dynamics for both size distributions is dominated by the jamming effect.

关 键 词：颗粒物质 毛细效应 竖直振动 离散元方法 

分 类 号：O552.421[理学—热学与物质分子运动论]