文章摘要
一种差速双螺杆非充满熔体输送模型
A Kind of Conveying Model of Partially Filled Fluid in a Non-Twin Screw Channel
  
DOI:10.16865/j.cnki.1000-7555.2018.08.015
中文关键词: 差速双螺杆  粘弹流体  非充满  可视化  输送模型
英文关键词: co-rotating non-twin screw  viscoelastic fluid  partial fill  visualization  conveying model
基金项目:国家自然科学基金资助项目(11272093)
作者单位
喻慧文1,2, 吴宏武1, 徐百平2, 周延辉2, 蓝叶青2, 王玫瑰2 1. 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 5290202. 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 
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中文摘要:
      自主研制了可切换螺杆转速比的机筒全程透明的同向双螺杆挤出仪器,可分别进行等速及差速双螺杆挤出可视化实验研究。制备了羧甲基纤维素钠溶液作为加工流体,观察不同计量加料情况下,螺杆构型及双螺杆转速对流体输送行为的影响,提出了全新的包括正位移和拖曳流的部分充满流体输送模型。实验表明,在非充满情况下,流体输送的拓扑路线不同,与等速双螺杆相比,物料在差速双螺杆左右螺槽内充满度存在非对称现象,上下啮合区存在较大的堆积现象。2种螺杆构型输送机理相似,均存在拖曳流、正位移输送及螺杆机筒间隙漏流。在非充满情况下,初步建立了差速同向自洁双螺杆的流体输送解析理论,得到了不同情况下充满度计算公式。当产量一定时,随着螺杆转速的增加,螺槽充满度下降,漏流增大,拖曳流量减少,而正位移量增加。
英文摘要:
      A novel co-rotating extrusion device was self-developed, where the whole barrel was transparent and the speed ratio output of one screw to another screw could be adjusted to 1∶1 or 2∶1. The visualization experiments were conducted to study the extrusion processes using the speed ratios of screw pairs of 1∶1 and 2∶1. A kind of colored sodium carboxymethyl cellulose was prepared as a test fluid, and its rheological properties were characterized. Effect of the screw configurations and screw speed on the conveying behavior was observed when the different feed rate was used. A new conveying model considering the positive displacement and drag flow was proposed. The experimental results show that the topologies of fluid conveying are quite different when the screw channel is partially filled. Compared with the twin screw configuration, the configuration with the speed difference in screw pair finds the asymmetry effect of fill degrees in the left and right channels, and the larger pile-up of fluid appears in the top and lower intermeshing regions. The both configurations share the similar conveying mechanism, including drag flow, positive displacement transport and the leakage between the barrel and the screw tip. Under the condition of partial fill, the analytical equations are derived for the first time regarding fluid conveying in co-rotating non-twin screw channels, and then the fill degrees under different operations can be obtained. When the output remains unchanged, with the increase of screw speed, the fill degree decreases along with the increase of leakage and the positive displacement transport in contrast to the decrease of drag flow.
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