摘要
纳米颗粒存在较强的颗粒间作用力。在传统磁化模型基础上添加范德华力模型,采用有限体积法(FVM)与离散单元法(DEM)进行数值模拟,运用Fluent-EDEM双平台耦合进行气固两相流分析,研究不同磁场方向与不同磁感应强度下范德华力对纳米颗粒运动的影响。结果表明,纳米颗粒间的范德华力对磁场流化床中颗粒运动的影响不可忽略,其在低磁感应强度下与磁化力之间存在明显牵制关系;磁场角度为0°时纳米颗粒分层现象明显,随场强增大分层效果逐渐缓解;范德华力也会在一定程度上促使颗粒运动方向发生偏转。范德华力模型的引入进一步拓宽了磁化模型的适用范围,为研究纳米颗粒在磁场中的运动提供数据支持。
Based on the traditional magnetization model,the van der Waals force model is added,and the finite volume method(FVM)and discrete element method(DEM)are used for numerical simulation.The gas-solid two-phase flow analysis is performed using the Fluent-EDEM dual platform coupling to study the effect of van der Waals force on the movement of nanoparticles under different magnetic field directions and different magnetic induction intensities.The results indicate that the impact of van der Waals forces between nanoparticles on particle movement in magnetic fluidized beds cannot be overlooked,and there exists a distinct inhibitory relationship between van der Waals forces and magnetization forces at low magnetic flux density.The stratification of nanoparticles becomes more pronounced at a magnetic field angle of 0°,and the stratification effect gradually diminishes with increasing field intensity.The van der Waals force also deflects the direction of particle motion to a certain extent.The introduction of van der Waals force model further broadens the application range of magnetization model and provides data support for studying the motion of nanoparticles in magnetic field.
作者
陈巨辉
安然
李丹
高浩铭
张坤
CHEN Juhui;AN Ran;LI Dan;GAO Haoming;ZHANG Kun(School of Mechanical and Power Engineering,Harbin University of Science and Technology,Harbin 150080,Heilongjiang,China)
出处
《化工学报》
EI
CSCD
北大核心
2024年第10期3518-3527,共10页
CIESC Journal
基金
黑龙江省重大科技专项(2019ZX03A02)
黑龙江省重点研发项目(GA21A301)。
关键词
纳米粒子
范德华力
流态化
聚集
磁场流化床
修正磁化模型
nanoparticles
van der Waals force
fluidization
aggregation
magnetic fluidized bed
modified magnetization model
