基于DNS方法的湿颗粒间静态液桥形态模拟研究  

Simulation on Static Liquid Bridge Shape Between Wet Particles Based on DNS Method

作　　者：宋志超 唐天琪 何玉荣[1,2,3] SONG Zhichao;TANG Tianqi;HE Yurong(School of Energy Science&Engineering,Harbin Institute of Technology,Harbin,150001,China;Heilongjiang Key Laboratory of New Energy Storage Materials and Processes,Harbin,Heilongjiang 150001,China;Zhengzhou Research Institute,Harbin Institute of Technology,450000,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001 [2]黑龙江省新型储能材料与储能过程研究重点实验室,哈尔滨150001 [3]哈工大郑州研究院,郑州450000

出　　处：《工程热物理学报》2024年第7期2040-2046,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金联合基金重点项目(No.U20A20304)。

摘　　要：湿颗粒被广泛应用在能源、化工、石油以及制药等工业过程中,由于湿颗粒间的液桥结构存在,在很大程度上影响湿颗粒的机械性能,并导致湿颗粒的迁移、聚集与黏附,然而该过程的物理机制并不清晰。因此,本研究以静态液桥为研究对象,采用直接数值模拟方法,应用VOF-IBM-DEM模型,将模拟结果与他人计算结果相比较,验证模型的正确性。探究不同湿颗粒表面润湿性与液体含量对毛细力以及静态液桥结构的影响,结果表明较小接触角以及较大的液体含量使得液桥具有较大的颈部半径;毛细力的大小与三相接触线所包围的面积成正比,随着接触角的增加、液体含量的减小而减小,本研究旨在为工业应用提供理论指导。Wet particles are widely applied in industrial processes such as energy,chemicals,petroleum,and pharmaceuticals.Due to the presence of liquid bridge structures between particles,liquid bridge structures significantly affect the mechanical properties of wet particles,leading to wet particle migration,aggregation,and adhesion.However,the physical mechanisms of this process are not clear.Therefore,this study focuses on static liquid bridges,employing the direct numerical simulation method to develop the VOF-IBM-DEM model.The simulation results are compared with those of others to validate the model's correctness.The investigation explores the effects of different particle surface wettabilities and liquid contents on capillary forces and static liquid bridge structures,aiming to provide theoretical guidance for industrial applications.The results indicate that smaller contact angles and larger liquid contents result in larger neck radii for the liquid bridge.The magnitude of capillary forces is proportional to the area enclosed by the three-phase contact line,decreasing with increasing contact angles and decreasing liquid content.

关 键 词：湿颗粒 静态液桥 直接数值模拟 毛细力 三相接触线 

分 类 号：TK123[动力工程及工程热物理—工程热物理]