Highly filled rubber compounds exhibit a unique rheological behavior, which is affected by its filler–filler and filler–matrix interactions leading to pronounced nonlinear viscoelasticity. The necessity to consider these characteristics in rheological testing and modeling, adds further complexity providing universally valid numerical descriptions. In the present study, the pressure driven contraction and capillary flow of a carbon black filled hydrogenated acrylonitrile–butadiene rubber compound is studied both experimentally and numerically. Rheological testing indicates no pronounced slippage at the wall but a shear sensitive plug flow at the centerline. The viscoelastic Kaye‐Bernstein–Kearsley–Zapas/Wagner, the viscoplastic Herschel–Bulkley and the viscous power‐law models are used in computational fluid dynamic simulations aiming to predict measured pressure drops in an orifice and various capillary dies. Viscoelastic modeling is found of particular importance describing contraction flow dominated areas, whereas viscous models are able to predict pressure drops of capillary flows well. POLYM. ENG. SCI., 60:32–43, 2020. © 2019 The Authors. Polymer Engineering & Science published by Wiley Periodicals, Inc. on behalf of Society of Plastics Engineers.

中文翻译：

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炭黑填充的橡胶混合物的收缩和毛细流动

高度填充的橡胶混合物表现出独特的流变行为，这受其填充物－填充物和填充物－基体相互作用的影响，从而导致明显的非线性粘弹性。在流变测试和建模中考虑这些特性的必要性进一步增加了提供通用有效数值描述的复杂性。在本研究中，通过实验和数值研究了填充炭黑的氢化丙烯腈-丁二烯橡胶混合物的压力驱动收缩和毛细流动。流变测试表明，在壁上没有明显的滑移，但在中心线处有剪切敏感的塞流。粘弹性的Kaye-Bernstein-Kearsley-Zapas / Wagner，粘塑性Herschel-Bulkley模型和粘性幂律模型用于计算流体动力学模拟，旨在预测孔板和各种毛细管模具中测得的压降。发现粘弹性模型对于描述收缩流为主的区域特别重要，而粘性模型能够很好地预测毛细管流的压降。POLYM。ENG。SCI。，60：32–43，2020.©2019作者。Wiley Periodicals，Inc.代表塑料工程师协会出版的《聚合物工程与科学》。