文章摘要
差速双螺杆非充满输送粘弹流体的可视化
Visualization of Flow Patterns of Partially Filled Viscoelastic Fluid in a Non-Twin Screw Extruder
  
DOI:10.16865/j.cnki.1000-7555.2018.08.014
中文关键词: 同向非对称双螺杆  非充满  可视化  流动分析  停留时间
英文关键词: co-rotating non-twin screw  partial fill  visualization  flow pattern  residence time
基金项目:国家自然科学基金资助项目(11272093);广东轻工职业技术学院青年项目(QN2018-014);容桂街道科技计划项目(回收PET碎片免造粒直接注塑成型混沌场强化技术);广东省科技计划项目(2016A010103046)
作者单位
喻慧文1,2, 徐百平1, 吴宏武2, 李 美1, 王玫瑰1 1. 广东轻工职业技术学院 广东高校高分子材料加工工程技术开发中心 广东省高分子材料先进加工工程研究中心广东 广州 510300 2. 华南理工大学 聚合物新型成型装备国家工程研究中心广东 广州 529020 
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中文摘要:
      给出了一种新型同向非对称双螺杆结构,2根螺杆的转速比为2∶1。为探索其物料流动以及混合特性,研制了全程可视化新型实验样机。采用一种常温粘弹性流体羧甲基纤维素钠着色后,观察流体在可视化设备中流动以及混合过程。采用4台摄像机采集挤出过程图片,提取图像关键尺寸后计算得到填充度,建立法向分布尺寸和填充度的关系模型。采用电导率法测定物料在各工况下的停留时间,考察了螺杆转速对物料轴向混合的影响。首次捕捉到新型双螺杆在非充满情况下的流动图像,发现上下啮合区及远离啮合区的非对称现象存在及单头螺槽内料陇的拉伸作用。
英文摘要:
      A novel type of co-rotating non-twin screw extruder was presented in this paper. The speed ratio of the left screw element to the right one was two. In order to investigate the flow pattern and mixing mechanism in the flow channels, a novel visualization device was developed, which has the global transparent barrel. A kind of colored sodium carboxymethyl cellulose, which representes viscoelastic fluid, was used to examine the flow and mixing patterns. Four cameras were used to capture the instantaneous images during whole processing, and then the critical sizes of these images were obtained. A relational model of the axial length of fluid and the filling degree was established. The conductance method was adopted to measure the residence time distributions for different operation conditions, and the influence of the screw speeds on the material axial mixing was investigated. It is the first time that the flow picture of partially filled fluid in the non-twin screw elements is captured. The asymmetry phenomenon is found in the intermeshing region and the region far away from it. It is also found that the material dam is experienced elongation action in the single-tip screw channel.
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