熔喷气流场中的纤维运动模拟与分析  

Simulation and analysis of fiber motion in airflow field of melt blowing

作　　者：韩万里 谢胜[2] 王新厚[3] 王玉栋 HAN Wanli;XIE Sheng;WANG Xinhou;WANG Yudong(Key Laboratory of Yarn Materials Forming and Composite Processing Technology,Jiaxing,Zhejiang 314000,China;College of Materials and Textile Engineering,Jiaxing University,Jiaxing,Zhejiang 314000,China;College of Mechanical Engineering,Donghua University,Shanghai 201620,China;Guangxi University of Science&Technology,Liuzhou,Guangxi 545026,China)

机构地区：[1]浙江省纱线材料成形与复合加工技术研究重点实验室,浙江嘉兴314000 [2]嘉兴学院材料与纺织工程学院,浙江嘉兴314000 [3]东华大学机械工程学院,上海201620 [4]广西科技大学,广西柳州545026

出　　处：《纺织学报》2023年第1期93-99,共7页Journal of Textile Research

基　　金：浙江省自然科学基金项目(LY22E060005);嘉兴市科技局公益项目(2022AY10023);浙江省纱线材料成形与复合加工技术研究重点实验室项目(MTC2022-08);国家自然科学基金项目(51776034);广西科技基地和人才专项(2021AC19425)。

摘　　要：为探究纤维在熔喷气流场中的牵伸运动过程,对熔喷气流场和纤维牵伸过程进行数值模拟。分析了熔喷气流场的分布特点,采用欧拉-拉格朗日法建立了熔喷纤维牵伸力学模型,获得熔喷纤维在气流场中的运动轨迹、牵伸倍数等信息;利用高速摄影机捕获了纤维在熔喷气流场中的运动轨迹并验证了模拟结果。结果表明:熔喷喷嘴下方存在气流回旋区,气流场分为射流单独流动区、射流汇合融合区和射流合并区;熔喷纤维的牵伸倍数先增加后减小,纤维运动在射流单独流动区出现鞭动,在射流合并区中存在纤维折叠成圈现象;射流汇合融合区是纤维细化的主要区域,该区域内纤维鞭动增加,牵伸倍数最大;验证实验中纤维运动中的鞭动、折叠成圈和运动轨迹与模拟结果一致。Objective In the melt blowing process,the polymer melt is attenuated and formed into microfiber in the high velocity airflow field,the fiber motion together with the airflow field play an important role in the fiber formation.The complex interplay between air velocity and polymer motion can affect the final fiber quality,and the velocity and distribution of the airflow requires study and analysis.The information of fiber motion is sought to reveal the mechanism of the formation of microfibers during melt blowing process.It is essential to understand and optimize the melt blowing process.Method The airflow field was simulated with the computational fluid dynamic approach for the melt blowing process.The characteristics of distribution for airflow field were investigated,with attentions paying to the airflow alone zone,airflow confluence zone and airflow merge zone.The fiber was modeled using mixed Euler-Lagrange approach,and the motion was predicted in the melt blowing process.The standard linear solid(SLS)models in the bead-viscoelastic fiber element were proposed for melt blown fiber formation simulation.The simulated fiber motion was compared with the fiber motion in experiment,which was captured with a high-speed camera.Results The simulation results show that there are two airflow recirculation zones between the converging jets for the melt blowing slot-die.The recirculation zones are in a subtriangular area near the die face and are filled with hot air(Fig.3).It is important for not only rapid fiber attenuation but also energy conservation.The melt blowing airflow field is divided into the airflow alone,the airflow contact fusion zone and the airflow merge zone.The distribution of the airflow field causes the airflow velocity to vary at different positions.At x=0 mm and z<1 mm,the airflow velocity fluctuates because there is a recirculation area of the airflow under the melt blowing die.When z>1 mm,the airflow velocity increases first and then decreases.The maximum air velocity is 165.88 m/s at z=5 mm,indica

关 键 词：熔喷技术 熔喷纤维 气流场 纤维模型 运动轨迹 欧拉-拉格朗日法 

分 类 号：TS174.1[轻工技术与工程—纺织材料与纺织品设计]