Measurement of velocity fields in a functional fluid by UVP method

采用 UVP 方法测量功能流体中的速度场

• 批准号: 11450079
• 负责人: SAWADA Tatsuo
• 金额: $ 8.45万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450079/
• 关键词: magnetic fluid; ultrasonic wave; UVP method; cluster; sloshing; magnetic field

We have carried out the precise measurement of sound velocity in a magnetic fluid under a uniform magnetic field last year. It was found that anisotropy of the propagation and hysteresis existed. But we have not be able to explain these interesting phenomena. In the present study, we have improved the experimental apparatus in order to carry out some experiments for 1MHz, 2MHz and 4MHz ultrasonic wave propagation. The ultrasonic propagation velocity is changed for the frequency of the ultrasonic wave. This change is supposed to be related with the length of chain-like clusters and the wave length.We have also performed visualization of these clusters of magnetic particles. Pixels of the picture was divided into lightness of 256 tones and cluster growth was evaluated by the standard deviation of the lightness distribution.

去年我们进行了均匀磁场下磁性流体中声速的精确测量。结果表明，该波传播存在各向异性和滞后现象。但我们还无法解释这些有趣的现象。在本研究中，我们改进了实验装置，以进行一些实验，为1MHz，2MHz和4MHz的超声波传播。超声波的传播速度随超声波的频率而改变。这种变化可能与链状团簇的长度和波长有关，我们还对链状团簇进行了可视化。图像的像素被划分为256个色调的亮度，并且通过亮度分布的标准偏差来评估簇生长。

项目成果

Hiroyuki Nishiyama: "Sound Velocity and Attenuation of Ultrasound in a Magnetic Fluid"Proceedings of JSME Fluids Engineering Conference 2001. 63 (2001)

Hiroyuki Nishiyama：“磁流体中超声波的声速和衰减”JSME流体工程会议论文集2001. 63 (2001)

木倉宏成: "磁性流体中の強磁性微粒子と非磁性微粒子の鎖状クラスタ-形成過程"日本混相流学会年会講演会2000(第1回)講演論文集. 25-26 (2000)

Hiroshige Kikura：“磁性流体中铁磁和非磁性颗粒链簇的形成过程”日本多相流学会 2000 年（第一届）年会论文集 25-26（2000）。

Hiroshige Kikura: "Velocity Profile Measurements of Magnetic Fluid Flow Using Ultrasonic Doppler Method"Journal of Magnetism and Magnetic Materials. Vol.201. 276-280 (1999)

Hiroshige Kikura：“使用超声波多普勒方法测量磁流体流的速度剖面”磁性和磁性材料杂志。

木倉宏成: "磁性流体と非磁性微粒子のクラスター現象"可視化情報. Vol.19. 131-132 (1999)

Hiroshige Kikura：“磁性流体和非磁性粒子的簇现象”可视化信息第 131-132 卷。

Tatsuo Sawada: "Sloshing Behavior of a Magnetic Fluid in a Cylindrical Container"Experiments in Fluids. Vol. 32, No. 2. 197-203 (2002)

Tatsuo Sawada：“圆柱形容器中磁流体的晃动行为”流体实验。