利用管道流变仪测量校准触变性和粘弹性剪切稀化流体

IF 1.8 Q3 MECHANICS
Fluids Pub Date : 2024-01-10 DOI:10.3390/fluids9010023
E. Cayeux
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引用次数: 0

摘要

一些非牛顿流体具有随时间变化的流变特性,如剪切应力取决于剪切历史,或应力过冲是流体运动开始时静止时间的函数。这种复杂流体的流变特性在工业流程中使用时可能不会保持不变,因此最好经常使用管道流变仪等简单耐用的设备测量这些特性。本文研究了如何从圆形管段不同流速下的压差测量结果中提取触变性和粘弹性剪切稀化流体随时间变化的流变特性。该方法包括建立触变型 Quemada 流体的流动模型,并利用稳态条件下的测量结果求解逆问题,从而找到模型参数。此外,还使用了麦克斯韦线性粘弹性模型来重现静止期后开始循环时观察到的应力过冲现象。管道流变仪的设计具有适当的功能,可以显示校准流变模型参数所需的触变效应和粘弹效应。流变测量的准确性取决于对可能影响观测结果的效应的了解,以及利用这些副作用而不是试图消除这些副作用的正确设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calibration of Thixotropic and Viscoelastic Shear-Thinning Fluids Using Pipe Rheometer Measurements
Some non-Newtonian fluids have time-dependent rheological properties like a shear stress that depends on the shear history or a stress overshoot that is a function of the resting time, when fluid movement is started. The rheological properties of such complex fluids may not stay constant while they are used in an industrial process, and it is therefore desirable to measure these properties frequently and with a simple and robust device like a pipe rheometer. This paper investigated how the time-dependent rheological properties of a thixotropic and viscoelastic shear-thinning fluid can be extracted from differential pressure measurements obtained at different flowrates along a circular pipe section. The method consists in modeling the flow of a thixotropic version of a Quemada fluid and solving the inverse problem in order to find the model parameters using the measurements made in steady-state conditions. Also, a Maxwell linear viscoelastic model was used to reproduce the stress overshoot observed when starting circulation after a resting period. The pipe rheometer was designed to have the proper features necessary to exhibit the thixotropic and viscoelastic effects that were needed to calibrate the rheological model parameters. The accuracy of rheological measurements depends on understanding the effects that can influence the observations and on a proper design that takes advantage of these side effects instead of attempting to eliminate them.
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来源期刊
Fluids
Fluids Engineering-Mechanical Engineering
CiteScore
3.40
自引率
10.50%
发文量
326
审稿时长
12 weeks
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