Constriction flows of monodisperse linear entangled polymers: Multiscale modeling and flow visualization
Constriction flows of monodisperse linear entangled polymers: Multiscale modeling and flow visualization
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DOI：
10.1122/1.1849180
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发表时间：
2005-03-01
影响因子：
3.3
通讯作者：
Young, RN
中科院分区：
文献类型：
--
作者：
Collis, MW;Lele, AK;Young, RN
我们探讨了单分散聚合物熔体的流变学和复杂的流动行为。合成了足够量的单分散聚合物，以便可以建立材料流变学和微加工行为。同时，我们采用了分子理论的聚合物流变学，是适合与实验流变数据和数值模拟的微加工流程进行比较。该模型能够匹配剪切和拉伸数据与最小的参数拟合。单分散聚合物的加工行为的实验数据首次作为使用具有11：1收缩入口和出口流的多通流变仪获得的流动双折射和压差数据。实验处理数据的匹配使用本构方程与拉格朗日数值求解器，FLOWSOLVE。结果表明，分子的本构响应和宏观加工行为之间的直接耦合，并区分流动效应，分别产生的取向和拉伸。(c)2005年，美国流变学会。
We explore both the rheology and complex flow behavior of monodisperse polymer melts. Adequate quantities of monodisperse polymer were synthesized in order that both the materials rheology and microprocessing behavior could be established. In parallel, we employ a molecular theory for the polymer rheology that is suitable for comparison with experimental rheometric data and numerical simulation for microprocessing flows. The model is capable of matching both shear and extensional data with minimal parameter fitting. Experimental data for the processing behavior of monodisperse polymers are presented for the first time as flow birefringence and pressure difference data obtained using a Multipass Rheometer with an 11:1 constriction entry and exit flow. Matching of experimental processing data was obtained using the constitutive equation with the Lagrangian numerical solver, FLOWSOLVE. The results show the direct coupling between molecular constitutive response and macroscopic processing behavior, and differentiate flow effects that arise separately from orientation and stretch. (c) 2005 The Society of Rheology.