The rheological behavior of aqueous magnetic fluids over a wide range of shear rates

IF 3.7 3区材料科学 Q1 INSTRUMENTS & INSTRUMENTATION

Smart Materials and Structures Pub Date : 2024-08-27 DOI:10.1088/1361-665x/ad6f83

Xiaofeng Yan, Xianggang Li, Qianmei Yin, Jingjing Tong, Tao Xie

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Abstract

A rheological measurement system was constructed to investigate the rheological behavior of magnetic fluids under a wide range of shear rates, and its feasibility was verified. The system is capable of measuring a shear rate range spanning five orders of magnitude, with a maximum shear rate of 10⁶ s⁻¹. It was utilized to study the time required for aqueous magnetic fluids in a magnetic field to reach a steady state, taking into account the coupling effect of the flow field and magnetic field. Additionally, the time needed for the magnetic fluids to return to their initial state after demagnetization was also measured. Based on these measurements, the rheological behavior of magnetic fluids with varying concentrations and magnetic field directions was studied. Results indicate that the residence time of the magnetic fluids in the magnetic field and the de-magnetization time have almost no effect on their viscosity. When the magnetic field direction is perpendicular to the flow direction, regardless of concentration, aqueous magnetic fluids exhibit shear thinning behavior; when it is parallel to the flow direction, high-concentration aqueous magnetic fluids show shear thickening, while low-concentration ones behave as Newtonian fluids. In this study’s shear rate range, no Newtonian regions were found in either high- or low-shear rate regions.

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水基磁性流体在各种剪切速率下的流变行为

为了研究磁性流体在各种剪切速率下的流变行为，我们构建了一套流变测量系统，并验证了其可行性。该系统能够测量五个数量级的剪切速率范围，最大剪切速率为 106 s-1。考虑到流场和磁场的耦合效应，该系统被用于研究磁场中的含水磁性流体达到稳定状态所需的时间。此外，还测量了磁性流体在退磁后恢复到初始状态所需的时间。根据这些测量结果，研究了不同浓度和磁场方向的磁性流体的流变行为。结果表明，磁性流体在磁场中的停留时间和去磁时间对其粘度几乎没有影响。当磁场方向与流动方向垂直时，无论浓度如何，水基磁性流体都表现出剪切变稀的行为；当磁场方向与流动方向平行时，高浓度水基磁性流体表现出剪切变稠的行为，而低浓度水基磁性流体则表现为牛顿流体。在本研究的剪切速率范围内，无论是高剪切速率区域还是低剪切速率区域，都没有发现牛顿区域。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Smart Materials and Structures 工程技术-材料科学：综合

CiteScore

7.50

自引率

12.20%

发文量

317

审稿时长

3 months

期刊介绍： Smart Materials and Structures (SMS) is a multi-disciplinary engineering journal that explores the creation and utilization of novel forms of transduction. It is a leading journal in the area of smart materials and structures, publishing the most important results from different regions of the world, largely from Asia, Europe and North America. The results may be as disparate as the development of new materials and active composite systems, derived using theoretical predictions to complex structural systems, which generate new capabilities by incorporating enabling new smart material transducers. The theoretical predictions are usually accompanied with experimental verification, characterizing the performance of new structures and devices. These systems are examined from the nanoscale to the macroscopic. SMS has a Board of Associate Editors who are specialists in a multitude of areas, ensuring that reviews are fast, fair and performed by experts in all sub-disciplines of smart materials, systems and structures. A smart material is defined as any material that is capable of being controlled such that its response and properties change under a stimulus. A smart structure or system is capable of reacting to stimuli or the environment in a prescribed manner. SMS is committed to understanding, expanding and dissemination of knowledge in this subject matter.