PROPERTIES OF DIAMAGNETIC FLUID IN HIGH-GRADIENT MAGNETIC-FIELDS
PROPERTIES OF DIAMAGNETIC FLUID IN HIGH-GRADIENT MAGNETIC-FIELDS
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DOI：
10.1063/1.356686
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发表时间：
1994-05-15
影响因子：
3.2
通讯作者：
IWASAKA, M
中科院分区：
文献类型：
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作者：
UENO, S;IWASAKA, M
本研究的重点是在静态磁场高达8 T，梯度为50 T/m的抗磁性流体的性质。我们使用了一个直径为100 mm，长为700 mm的水平型超导磁体。我们观察到的现象是，水的表面被推回磁场的更高的梯度。在z = +/- 50-80 mm处形成两个“冻结”叶栅;靠近磁体中心的水面被分开，水室的底部出现。闸室两端的水位被抬高。为了研究磁场中抗磁流体的流体动力学特性，我们制作了一个穿过超导磁体内腔的塑料管流体回路。当中心磁场从0 T变化到8 T时，蒸馏水的流速降低，在8 T时停止流动。对磁场中抗磁性流体进行了应力分析，解释了这些现象的机理。抗磁流体在约400 T2/m的流体动力学可以与弱磁场中的铁磁流体的流体动力学进行比较。研究抗磁性流体在梯度磁场中的作用，对于理解磁场的生物效应机制具有重要意义。
This study focuses on the properties of diamagnetic fluid in static magnetic fields up to 8 T with the gradient of 50 T/m. We used a horizontal type of superconducting magnet with a bore 100 mm in diameter and 700 mm long. We observed the phenomenon that the surface of the water was pushed back by magnetic fields of higher gradients. Two ''frozen'' cascades were formed at z = +/- 50-80 mm; the surface of the water near the center of the magnet was parted, and the bottom of the water chamber appeared. The water level at both ends of the chamber was lifted up. In order to investigate the hydrodynamics of diamagnetic fluid in magnetic fields, we made a fluidic circuit with plastic tubing which passed through the superconducting magnet's bore. When magnetic fields in the center of the bore were changed from 0 to 8 T, the flow velocity of distilled water decreased, and the flow was stopped at 8 T A stress analysis of diamagnetic fluid in magnetic fields was carried out to explain the mechanism of these phenomena. The hydrodynamics of diamagnetic fluid in approximately 400 T2/m is able to compare with that of ferromagnetic fluid in weak magnetic fields. Studying the role of diamagnetic fluid in gradient magnetic fields is important in understanding the mechanism of biological effects of magnetic fields.