Numerical Simulation of Temperature and Mixing Performances of Tri-screw Extruders with Non-isothermal Modeling
Numerical Simulation of Temperature and Mixing Performances of Tri-screw Extruders with Non-isothermal Modeling
复制标题
非等温建模三螺杆挤出机温度和混合性能的数值模拟
DOI：
10.19026/rjaset.5.4585
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发表时间：
2013-04
期刊：
影响因子：
--
通讯作者：
Y. D. He
中科院分区：
文献类型：
--
作者：
X. Z. Zhu;G. Wang;Y. D. He
三螺杆挤出机是食品和聚合物加工的新型挤出设备。特别是在横截面上，只在中心区域存在一个特殊的回流。为了减小轴向效应，采用颗粒跟踪技术建立了三螺杆挤出机的二维非等温瞬态有限元模型。瞬态温度场和流场是用商业代码Polyflow计算的。此外，还研究了粘性加热引起的温升对三螺杆挤出机混合指数、偏析尺度、平均和瞬时平均混合效率等流动和混合特性的影响。结果表明：在特殊的中心区域，速度和混合指数较小，粘度和温度较大，表明混合效率较差；当考虑自热传热时，三螺杆挤出机的分散混合效率降低，而分布混合和拉伸混合效率均有所提高。特别是采用非等温模型时，由于粘滞耗散的减少，流体颗粒在三螺杆挤出机中的拉伸效应降低。
Tri-screw extruders are new extrusion equipments for food and polymer processing. Especially, there is one special circumfluence exists in center region only at cross section. In this study, the 2D transient and non- isothermal modeling of a tri-screw extruder is established by using Finite Element Method (FEM) with particle tracking technology to reduce the axial effects. The transient temperature and flow fields are calculated with a commercial code, Polyflow. Moreover, the effect of temperature rise due to viscous heating on the flow and mixing characteristics such as mixing index, segregation scale, mean and instantaneous time-averaged efficiency of mixing for the tri-screw extruder are carried out. The results show that in the special center region, the velocity and mixing index is small and viscosity and temperature are relatively big, indicating the poor mixing efficiency. When the heat transfers due to self-heating is considered, the dispersive mixing of the tri-screw extruder decreases, but the distributive mixing and stretching mixing efficiency all increase for the tri-screw extruder. In particular, the stretching effect of the fluid particles in the tri-screw extruder decreases due to the decrease of viscous dissipation when the non-isothermal model is employed.
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影响因子：
--
作者：
X. Z. Zhu;Y. Xie;H. Yuan
通讯作者：
X. Z. Zhu;Y. Xie;H. Yuan
影响因子：
--
作者：
X. Z. Zhu;Y. Xie;Y. Miao
通讯作者：
X. Z. Zhu;Y. Xie;Y. Miao
影响因子：
3.7
作者：
Yun Bai;U. Sundararaj;K. Nandakumar
通讯作者：
Yun Bai;U. Sundararaj;K. Nandakumar
DOI：
--
发表时间：
2001
期刊：
China Plastics
影响因子：
--
作者：
J. Nan
通讯作者：
J. Nan
影响因子：
3.2
作者：
T. Ishikawa;S. Kihara;K. Funatsu
通讯作者：
T. Ishikawa;S. Kihara;K. Funatsu