黏性颗粒在不同截面形状纤维表面沉积特性的数值模拟  

Numerical simulation of fiber surface deposition characteristics of viscous particles in different cross-sectional shapes

作　　者：刘倩倩 尤健明 王琰 孙成磊 JIRI Militky DANA Kremenakova 姚菊明[2,5] 祝国成 LIU Qianqian;YOU Jianming;WANG Yan;SUN Chenglei;JIRI Militky;DANA Kremenakova;YAO Juming;ZHU Guocheng(College of Textile Science and Engineering(International Institute of Silk),Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang-Czech Joint Laboratory of Advanced Fiber Materials,Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Zhaohui Filter Technology Co.,Ltd.,Jiaxing 314511,China;Faculty of Textile Engineering,Technical University of Liberec,Liberec 46117,the Czech Repubilc;Advanced Textile Technology Innovation Center(Jianhu Laboratory),Shaoxing 312000,China)

机构地区：[1]浙江理工大学纺织科学与工程学院(国际丝绸学院),杭州310018 [2]浙江理工大学浙江-捷克先进纤维材料联合实验室,杭州310018 [3]浙江朝晖过滤技术股份有限公司,浙江嘉兴314511 [4]利贝雷茨理工大学纺织工程学院,捷克利贝雷茨46117 [5]现代纺织技术创新中心(鉴湖实验室),浙江绍兴312000

出　　处：《现代纺织技术》2024年第6期41-51,共11页Advanced Textile Technology

基　　金：浙江省“尖兵”“领雁”研发攻关计划项目(2023C01194);国家自然科学基金项目(51803182);高等学校学科创新引智计划资助项目(D21011);浙江理工大学基本科研业务费专项资金项目(22202304-Y)。

摘　　要：为了探究黏性颗粒在不同截面形状纤维表面的沉积特性,选择截面为圆形、三角形和十字形的纤维作为研究对象,通过Digimat、Solidworks建模软件构建在空间中呈随机分布的刚性三维纤维体模型;利用计算流体力学和离散单元法耦合的方法,基于laminar流场特征,引入JKR(Johnson-kendall-roberts)接触模型,对黏性颗粒在不同纤维表面的沉积特性进行气-固两相耦合数值模拟。模拟结果表明:在黏性颗粒的运动过程中,过滤机理会随时间而变化。初期,捕集主要依赖纤维表面的吸附作用,而后期主要通过纤维本身和颗粒之间的黏附团聚运动共同实现,形成了“尘滤尘”现象。此外,颗粒间滚动摩擦系数对颗粒在纤维上沉积的影响很大。滚动摩擦系数越大,颗粒之间的接触力链结构越稳定,颗粒更难脱落。在3种截面形状的纤维中,十字形截面的捕集效率最高,三角形次之,圆形最低。该研究探究了黏性颗粒与纤维之间的相互作用,优化了纤维结构和布局,为提高空气过滤材料的过滤效率提供了设计思路和理论参考。Numerous researchers focus on the simulation of factors affecting particle deposition and agglomeration within the fiber,while few researchers have paid attention to the changes in the coefficient of rolling friction between the particles on particle deposition and agglomeration.To simplify the process of calculating the fiber filtration media model is also limited to the circular regular arrangement of the fiber model,and if the fiber model and the actual filter media have a lower degree of conformity,the difference between the simulation results and the actual test results will be larger.In this paper,by observing and analyzing the surface morphology and structural characteristics of polyester fibers with round,triangular and cruciform cross sections,a three-dimensional fiber model with a fiber diameter of 5μm,an SVF of 9%,and randomly distributed cross sections of round and triangular fibers in space was established by using Digimat fiber modeling software.Based on the CFD-DEM coupling method,the JKR contact model was introduced under the laminar flow field to analyze the changes of the filtration mechanism of the particles during the motion process,the influence of the changes of the rolling friction coefficient between the particles on the deposition characteristics of the viscous particles inside the fibers with different cross-sectional shapes,and the influence of the fiber cross-sectional shapes on the particles trapping efficiency.The filtration mechanism of particles in the process of time-varying movement changes,and in the early stage of filtration,the number of particles produced is small,mainly relying on the fiber itself to capture particles,while surface filtration plays a dominant role;in the late stage of filtration,most of the particles are accumulated in the windward side of the fiber to form a cluster of dendritic particles,and the filtration mechanism changes to a portion of the capture by the fiber itself,with the other portion of the dendritic particles being deposited in the fiber cluste

关 键 词：气-固两相流 纤维表面 黏性颗粒 滚动摩擦系数 颗粒捕集 

分 类 号：TS151[轻工技术与工程—纺织材料与纺织品设计]