均匀磁场下铁磁流体固体液滴拉伸变形研究

IF 2.6 4区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Magnetochemistry Pub Date : 2023-09-30 DOI:10.3390/magnetochemistry9100215
Gui-Ping Zhu, Shi-Hua Wu, Shu-Ze Zheng, Lai Li, Nam-Trung Nguyen
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引用次数: 0

摘要

在过去的几十年里,数字微流体的研究取得了显著的增长,并且该领域仍在不断吸引着人们的关注,以实现相关的机制和潜在的应用。许多研究都致力于在各种基础和应用场景中主动操纵液滴。本文研究了外均匀磁场作用下铁磁流体液滴的变形。液滴精确地分散在由聚甲基丙烯酸酯(PMMA)板组装的容器的底表面。采用矿物油代替空气作为周围介质,便于拉伸,防止铁磁流体中水溶剂的蒸发。首先对容器进行设计和加工,观察液滴在非混相矿物油介质中的形状和润湿性。给出了液滴在水平均匀磁场作用下的变形和工作机理。在不同的磁场强度下,液滴在与外加磁场平行的水平方向上被拉伸。由于体积守恒,高度中的尺寸相应减小。在磁力、粘性力和界面张力的耦合作用下,接触角先随磁场增大而增大,磁化饱和后基本保持不变。数值方法与实验结果一致,清晰地揭示了液滴的场耦合机理和非线性变形。
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Investigation of Ferrofluid Sessile Droplet Tensile Deformation in a Uniform Magnetic Field
A significant growth of research on digital microfluidics has been achieved over the past several decades, and the field is still attracting increasing attention for fulfilling relevant mechanisms and potential applications. Numerous studies have been devoted to actively manipulating droplets in a variety of fundamental and applicational scenarios. In this work, the deformation of ferromagnetic fluid droplets is studied under an external uniform magnetic field. The droplets are precisely dispersed on the bottom surface of a container assembled with polymer methacrylate (PMMA) plates. Mineral oil is applied instead of air as the surrounding medium for easy stretching and preventing water solvent evaporation in ferrofluid. The design and processing of the container are firstly carried out to observe the shape and characterize the wettability of the droplets in the immiscible mineral oil medium. Furthermore, the droplets’ deformation and the working mechanism are given under the action of the horizontal uniform magnetic field. At different magnetic field intensities, the droplet is stretched in the horizontal direction parallel to the applied field. Due to volume conservation, the dimension in the height reduces correspondingly. With the coupling effect of magnetic force, viscous force and interfacial tension, the contact angle first increases with the magnetic field and then basically remains unchanged upon magnetization saturation. Consistent with the experimental results, the numerical method clearly reveals the field coupling mechanism and the nonlinear deformation of the sessile droplet.
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来源期刊
Magnetochemistry
Magnetochemistry Chemistry-Chemistry (miscellaneous)
CiteScore
3.90
自引率
11.10%
发文量
145
审稿时长
11 weeks
期刊介绍: Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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