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Microscopic Characteristics of Magnetorheological Fluids Subjected to Magnetic Fields
Journal of Magnetism and Magnetic Materials ( IF 2.5 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.jmmm.2020.166443
Ningning Wang , Xinhua Liu , Shuaishuai Sun , Grzegorz Królczyk , Zhixiong Li , Weihua Li

Abstract With the aim of studying the microscopic characteristics of a magnetorheological fluid (MRF) in a magnetic field, the theoretical analyses of the particles dynamics in a magnetic field are presented, and a model for the particle motion is proposed. Based on these analyses, a three-dimensional numerical simulation of the microstructure of MRFs in different magnetic fields is performed. Furthermore, the microstructures of the MRFs are investigated using industrial computed tomography (CT) imaging. The numerical simulation and industrial CT results indicate that the chain structure of the same MRF becomes more apparent as the magnetic field strength increases, and in the same external magnetic field, this chain structure also becomes more apparent with an increase in the particle volume fraction. The lengths of particle chains in different magnetic fields are also captured in the industrial CT experiments. When the magnetic field strength is 12 mT, the particle chains of the MRF with a particle volume fraction of 30% reach more than 10 mm in length, which bridge the inner diameter of the container, and the dense clusters-like structure is formed, the clusters-like structure becomes denser with an increase in magnetic field. Moreover, the particle chain lengths of MRF with high particle volume fractions increase sharply with the magnetic field. The experiments demonstrated that the industrial CT is an efficient method to study the microstructures of MRFs by providing particle distributions of MRFs more clearly and intuitively.

中文翻译:

磁场作用下磁流变流体的微观特征

摘要 为了研究磁场中磁流变流体(MRF)的微观特性,提出了磁场中粒子动力学的理论分析,并提出了粒子运动的模型。在这些分析的基础上,对不同磁场下 MRF 的微观结构进行了三维数值模拟。此外,使用工业计算机断层扫描 (CT) 成像研究了 MRF 的微观结构。数值模拟和工业CT结果表明,随着磁场强度的增加,相同MRF的链状结构变得更加明显,并且在相同的外磁场下,随着颗粒体积分数的增加,这种链状结构也变得更加明显。在工业 CT 实验中也捕获了不同磁场中粒子链的长度。当磁场强度为12 mT时,颗粒体积分数为30%的MRF的颗粒链长度达到10 mm以上,桥接容器内径,形成密集的簇状结构,随着磁场的增加,簇状结构变得更加致密。此外,具有高粒子体积分数的 MRF 的粒子链长度随磁场急剧增加。实验表明,工业 CT 是一种研究 MRF 微观结构的有效方法,可以更清晰、直观地提供 MRF 的颗粒分布。颗粒体积分数为30%的MRF的颗粒链长度达到10mm以上,桥接容器内径,形成致密的簇状结构,簇状结构变得更致密磁场的增加。此外,具有高粒子体积分数的 MRF 的粒子链长度随磁场急剧增加。实验表明,工业 CT 是一种研究 MRF 微观结构的有效方法,可以更清晰、直观地提供 MRF 的颗粒分布。颗粒体积分数为30%的MRF的颗粒链长度达到10mm以上,桥接容器内径,形成致密的簇状结构,簇状结构变得更致密磁场增加。此外,具有高粒子体积分数的 MRF 的粒子链长度随磁场急剧增加。实验表明,工业 CT 是一种研究 MRF 微观结构的有效方法,可以更清晰、直观地提供 MRF 的颗粒分布。随着磁场的增加,簇状结构变得更加致密。此外,具有高粒子体积分数的 MRF 的粒子链长度随磁场急剧增加。实验表明,工业 CT 是一种研究 MRF 微观结构的有效方法,可以更清晰、直观地提供 MRF 的颗粒分布。随着磁场的增加,簇状结构变得更加致密。此外,具有高粒子体积分数的 MRF 的粒子链长度随磁场急剧增加。实验表明,工业 CT 是一种研究 MRF 微观结构的有效方法,可以更清晰、直观地提供 MRF 的颗粒分布。
更新日期:2020-05-01
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