Analysis of shear-thinning fluid flow in intermeshing twin-screw extruders
Analysis of shear-thinning fluid flow in intermeshing twin-screw extruders
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DOI：
10.1007/s004190050109
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发表时间：
1997-02
影响因子：
2.8
通讯作者：
G. Böhme;O. Wünsch
中科院分区：
文献类型：
--
作者：
G. Böhme;O. Wünsch
本文分析了广义牛顿流体在旋转双螺杆设备中的三维不可压缩流动，其中充液区域相当复杂，且随螺杆旋转而随时间变化。考虑到流场在时间上具有周期性，同时在轴向上也具有周期性，采用混合有限元法进行离散化。用牛顿迭代法处理非线性代数方程组，其中用改进的Uzawa算法求解具有不定稀疏系数矩阵的线性子问题。通过模拟不同工况，对螺杆特性进行数值提取，论证了底波拉数对螺杆特性的影响。选取的流场以图形化的方式展示了啮合螺杆的工作原理，并展示了非线性粘性蠕变流的运动可逆性的某些对称性。
The paper deals with the analysis of three-dimensional incompressible flows of generalized Newtonian liquids in corotating twin-screw equipment where the fluid-filled region is rather complex and changes in time as the screws rotate. Taking notice of the fact that the flow fields are periodic in time and, simultaneously, periodic in axial direction, a mixed finite element method is applied for the sake of discretization. The resulting systems of nonlinear algebraic equations are treated by a Newton iteration where the linear subproblems with indefinite sparse coefficient matrices are solved by applying a modified Uzawa algorithm. By simulating different working conditions, the screw characteristics are extracted numerically, and the influence of Deborah number is demonstrated. Selected flow fields are visualized grafically illustrating the intermeshing screw operation principle and demonstrating certain symmetries connected with the kinematic reversibility of nonlinear viscous creeping flows.