粘性和粘弹性流体等温毛细管流变法压降的数值研究

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-05-03 DOI:10.1515/ipp-2022-4322

H. Tseng

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引用次数: 0

摘要

在聚合物熔体的毛细管流变测量中，总压降由三个主要组成部分组成:剪切粘度、拉伸粘度和正应力差。传统上，粘弹性本构方程被用来对压降进行准确的预测。在过去的实验测量和数值计算中，很难对主要成分进行研究。在等温毛细管流动模拟中，对经典的White-Metzner粘弹性本构方程进行了有用的改进，并结合了加权剪切/拉伸黏度。分析短模拉伸引起的压降和长模剪切引起的压降具有重要意义，且正应力差的贡献很小。

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Numerical investigation of pressure drop within isothermal capillary rheometry for viscous and viscoelastic fluids

Abstract In capillary rheometry of a polymer melt, the total pressure drop consists of three primary components: shear viscosity, extensional viscosity, and normal stress differences. Traditionally, viscoelastic constitutive equations have been used to produce accurate predictions regarding the pressure drop. It is difficult to investigate the primary components in past experimental measurements and numerical computations. The useful improvement of the classic White-Metzner viscoelastic constitutive equation coupled with the weighted shear/extension viscosity is performed in isothermal capillary flow simulations. It is significant to analyze the extension-induced pressure drop for a short die and the shear-induced pressure drop for a long die, along with a small contribution of normal stress differences.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.