垂直磁场下液体和固体基底上磁流体层的解体

G. A. Khokhryakova
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引用次数: 0

摘要

这项工作的目的是通过实验研究在垂直磁场的影响下,位于液体非润湿基底上的磁性流体水平层分解成有序液滴系统的过程。在实验中,所研究的液体以两层体系的形式填充一个圆柱形玻璃比色皿,并被放置在一个水平平台上,平台的中心是与直流电源相连的亥姆霍兹线圈。使用安装在线圈系统顶部的高速数字摄像机监测磁流体层自由表面不稳定性的发展。结果确定了磁场临界强度与撕裂层厚度和磁流体磁感应强度的关系。获得的实验数据与现有的磁流体层不稳定性理论研究结果进行了比较。与固体基底的情况相比,液体基底上磁流体层的破裂发生在临界磁场强度的较低值。在这种情况下,固体基板上自由表面磁流体层的不稳定性发展发生在两倍于液体基板上磁流体层界面不稳定性强度的场强下。使用液体基底可以打破这种磁流体层,而这种磁流体层在固体基底上的变形仅受表面周期性扰动的限制。导致液态基底上连续磁流体层解体的临界强度大小随磁流体层厚度的增加而增大。磁性流体磁感应强度的增加会导致临界磁场强度的降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Disintegration of Magnetic Fluid Layer on Liquid and Solid Substrates in Vertical Magnetic Field
The purpose of this work is to experimentally study the process of decomposition of a horizontal layer of a magnetic fluid lying on a liquid non-wettable substrate into an ordered system of drops under the influence of a vertical magnetic field.Methods. In the experiment, the studied liquids in the form of a two-layer system filling a cylindrical glass cuvette were placed on a horizontal platform in the center of the Helmholtz coils connected to a direct current source. The development of magnetic fluid layer free surface instability was monitored using a high-speed digital video camera installed at the top of the coil system.Results. The dependence of the critical strength of the magnetic field on the thickness of the torn layer and the magnetic susceptibility of the magnetic fluid is determined. The obtained experimental data are compared with the results of existing theoretical studies of the instability of the magnetic fluid layer. Compared to the case of a solid substrate, the rupture of the magnetic fluid layer on a liquid substrate occurred at lower values of the critical field strength. In this case, the development of instability of the free surface magnetic fluid layer on a solid substrate occurs at field strengths twice as high as the instability strength of the interface of the layer on a liquid substrate.Conclusion. The use of a liquid substrate makes it possible to break such layers of the magnetic fluid, the deformation of which on a solid substrate is limited only by a periodic perturbation of the surface. The magnitude of the critical strength leading to the disintegration of a continuous magnetic fluid layer on a liquid substrate increases with increasing thickness of this layer. An increase in the magnetic susceptibility of the magnetic fluid leads to a decrease in the critical field strength.
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