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首页> 外文期刊>International Polymer Processing: The Journal of the Polymer Processing Society >Simulation of Co-Rotating Twin Screw Extrusion Process Subject to Pressure-Dependent Wall Slip at Barrel and Screw Surfaces: 3D FEM Analysis for Combinations of Forward- and Reverse-Conveying Screw Elements
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Simulation of Co-Rotating Twin Screw Extrusion Process Subject to Pressure-Dependent Wall Slip at Barrel and Screw Surfaces: 3D FEM Analysis for Combinations of Forward- and Reverse-Conveying Screw Elements

机译：在筒体和螺杆表面受压力变化影响的同向旋转双螺杆挤出过程的模拟：正向和反向输送螺杆元件组合的3D有限元分析

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Mathematical modeling and simulation of the coupled flow, deformation, heat and mass transfer, and rate of reactions occurring in the twin screw extruder allow the optimization of process parameters and the screw and barrel geometries. In mathematical modeling of the twin screw extrusion process the conventional flow boundary condition at the screw and barrel walls is the no-slip condition. However, most complex fluids, including polymers, polymeric suspensions and blends, exhibit wall slip, with the slip behavior depending on the intrinsic properties of the materials being processed, the operating conditions, the geometries of the barrel, screw and the die, and the properties of the solid surfaces. Typically, the slip velocity is specified to be a function of temperature, stress condition at the wall and the materials of construction. However, recent investigations have further revealed that the wall slip behavior can also be significantly affected by pressure. With an objective of considering the effects of wall slip on the dynamics of twin screw extrusion, fully-intermeshing co-rotating twin screw extrusion of a concentrated suspension is analyzed using three-dimensional finite element method, FEM, subject to the wall slip boundary condition. The wall slip boundary condition is first applied systematically to barrel and screw surfaces individually followed by the application of wall slip to both surfaces simultaneously. In an inte- grated fashion both the forward-conveying (pressure-generating) and reverse-conveying (pressure-losing) screw sections are considered. The effects of pressure on wall slip are also analyzed and elucidated.
机译：在双螺杆挤出机中发生的耦合流动，变形，传热和传质以及反应速率的数学建模和仿真可以优化工艺参数以及螺杆和机筒的几何形状。在双螺杆挤出过程的数学建模中，螺杆和机筒壁处的常规流边界条件为防滑条件。但是，大多数复杂的流体，包括聚合物，聚合物悬浮液和混合物，都表现出壁滑移，其滑移行为取决于所加工材料的固有特性，操作条件，机筒，螺杆和模具的几何形状以及实体表面的特性。通常，将滑移速度指定为温度，墙壁上的应力条件和建筑材料的函数。但是，最近的研究进一步表明，壁滑行为也可能受到压力的显着影响。为了考虑壁面滑移对双螺杆挤出动力学的影响，在三维滑移边界条件下，采用三维有限元方法有限元分析了全悬浮共旋转双螺杆挤出的悬浮液。 。首先将壁滑边界条件系统地分别应用于圆柱和螺纹表面，然后将壁滑同时应用于两个表面。以集成方式考虑了正向输送（压力产生）和反向输送（压力损失）螺杆部分。还分析并阐明了压力对壁滑的影响。

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