Extended Regression Models for Predicting the Pumping Capability and Viscous Dissipation of Two-Dimensional Flows in Single-Screw Extrusion
Extended Regression Models for Predicting the Pumping Capability and Viscous Dissipation of Two-Dimensional Flows in Single-Screw Extrusion
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DOI：
10.3390/polym11020334
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发表时间：
2019-02-01
期刊：
影响因子：
5
通讯作者：
Miethlinger, Juergen
中科院分区：
文献类型：
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作者：
Roland, Wolfgang;Kommenda, Michael;Miethlinger, Juergen
通常，需要数值方法来模拟聚合物熔体在单螺杆挤出机中的非牛顿流动。现有的近似方程建模的吞吐量-压力关系和粘性耗散的应用范围有限，特别是当它涉及到特殊的螺杆设计。捕获了Pi（V）< 2.0的最大无量纲通过量，这意味着对于低幂律指数，最小无量纲压力梯度Pi（p，z）>= -0.5。本文提出了一个分析近似模型，用于预测在较大的影响参数范围内（Pi（p，z）>=-1.0和t/D-b）的计量通道的泵送能力和粘性耗散
Generally, numerical methods are required to model the non-Newtonian flow of polymer melts in single-screw extruders. Existing approximation equations for modeling the throughput-pressure relationship and viscous dissipation are limited in their scope of application, particularly when it comes to special screw designs. Maximum dimensionless throughputs of Pi(V) < 2.0, implying minimum dimensionless pressure gradients Pi(p,z) >= -0.5 for low power-law exponents are captured. We present analytical approximation models for predicting the pumping capability and viscous dissipation of metering channels for an extended range of influencing parameters (Pi(p,z) >= -1.0, and t/D-b