摘要
为了研究螺杆转速对啮合型同向双螺杆中流场和混合性能的影响,使用有限元软件Polyflow对羧甲基纤维素钠流动以及混合过程进行数值模拟,分析了常温黏弹流体——羧甲基纤维素钠在流道全充满状态下,相同温度下的流动过程中转速对速度场、剪切速率及停留时间、分离尺度等流动以及混合表征量的影响。通过可视化的实验得出了挤出过程中末端的平均粒径和变异系数。结果表明,随着螺杆转速的增加,同向双螺杆速度场增大、剪切速率增大、剪切作用提高。高转速下的停留时间相对最短且分离尺度更小。可视化实验显示高转速下的挤出过程中的示踪剂的液滴尺寸和变异系数更小,具有更好的分散混合能力。综合分析可知高转速下同向双螺杆挤出机具有更好的混炼效果。
To investigate the influence of screw speed on the flow field and mixing performance in co-rotating intermeshing twin-screws,numerical simulations are conducted the were conducted using the finite element software Polyflow on the flow and mixing processes of sodium carboxymethyl cellulose.The influence of rotation speed on flow and mixing characteristics such as velocity field,shear rates,residence time,and separation scale are analyzed for the viscoelastic fluid sodium carboxymethyl cellulose at room temperature in a fully filled flow channel under the same temperature conditions.The average particle size and variation coefficient at the end of the extrusion process were obtained through visual experiments.The results indicate that increasing the screw speed led to larger velocity fields,higher shear rates,and enhanced shearing effects in co-rotating twin-screws.The residence time at high rotation speeds is relatively the shortest,and the separation scale is smaller.Visual experiments demonstrate that under high rotation speeds,tracer droplet size and coefficient of variation during the extrusion process are smaller,indicating improved dispersion and mixing capabilities.Comprehensive analysis shows that co-rotating twin-screw extruders operate more effectively in terms of blending at higher speeds.
作者
王志群
喻慧文
董沛洲
揭旭彰
靳洪胜
Wang Zhiqun;Yu Huiwen;Dong Peizhou;Jie Xuzhang;Jin Hongsheng(Jiangmen Key Laboratory of Intelligent Manufacturing of Polymer Materials,Wuyi University,Jiangmen,Guangdong 529020,China;School of Mechanical and Automation Engineering,Wuyi University,Jiangmen,Guangdong 529020,China;Shenzhen Saifang Technology Co.,Ltd.,Shenzhen,Guangdong 518000,China)
出处
《机电工程技术》
2024年第12期72-75,157,共5页
Mechanical & Electrical Engineering Technology
基金
国家自然科学基金资助项目(12102306)
广东省教育厅重点领域专项项目(2023ZDZX3039)。
关键词
同向双螺杆
数值模拟
混合性能
停留时间
分离尺度
co-rotating twin screw
numerical simulation
mixing performance
residence time
separation scale
作者简介
第一作者:王志群(1998-),男,硕士研究生,研究领域为先进制造技术与装备;通讯作者:喻慧文(1987-),女,博士,副教授,硕士生导师,研究领域为先进制造技术与装备,已发表论文25篇。
