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Dependence of ultrasonic propagation properties of functional fluids on cluster formation

功能流体的超声波传播特性对团簇形成的依赖性

基本信息

批准号：
14550158
负责人：
SAWADA Tatsuo
金额：
$ 2.37万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550158/
关键词：
Magnetic Fluid MR Fluid Functional Fluid Cluster Ultrasonic Wave Sound Velocity Magnetic Field

项目摘要

Ultrasonic propagation velocities in water-based and kerosene-based magnetic fluids and in an MR fluid under uniform magnetic field are investigated experimentally. Measurements of ultrasonic propagation velocity are carried out while measuring the elapsed time of magnetic field application and while varying the magnetic field intensity and the angle between the direction of ultrasonic propagation and the direction of the magnetic field. The ultrasonic propagation velocity changes with the elapsed time and intensity of an external magnetic field because of the formation of clusters. In varying the angle of the applied magnetic field, anisotropy of the ultrasonic propagation velocity is observed, In HC-50, the percentage change of ultrasonic propagation velocity with applied magnetic field is smaller than that in W-40. It seems that the chain-like clusters formed in HC-50 are smaller than those in W-40. These interesting results are believed to be dependent on characteristic rheological properties of magnetic fluids that are related to surfactants that are applied to the particles. The percentage change of ultrasonic propagation velocity in the MR fluid is one order of magnitude larger than that in magnetic fluids and is observed abruptly with the application of the magnetic field.We obtained several interesting experimental results related to ultrasonic propagation velocities. These results have not been predicted by previous theoretical approaches. At the present stage, it is necessary to carry out more various and detailed experiments to clarify the mechanisms producing these ultrasonic propagation properties in magnetic and MR fluids.

实验研究了均匀磁场作用下超声波在水基和煤油基磁流体以及磁流变液中的传播速度。超声波传播速度的测量是在测量施加磁场的经过时间的同时并且在改变磁场强度和超声波传播方向与磁场方向之间的角度的同时进行的。由于团簇的形成，超声波的传播速度随外加磁场的时间和强度而变化。在不同的磁场角度下，观察到超声波传播速度的各向异性。在HC-50中，超声波传播速度随磁场的变化百分比小于W-40。HC-50中形成的链状团簇似乎比W-40中形成的链状团簇小。这些有趣的结果被认为是依赖于特性的流变性质的磁性流体，是与表面活性剂施加到颗粒。超声波在磁流变液中传播速度的变化率比在磁性液体中的大一个数量级，并且随着磁场的施加而发生突变，我们得到了一些与超声波传播速度有关的有趣的实验结果。这些结果是以前的理论方法所没有预测到的。在现阶段，有必要进行更多的各种和详细的实验，以澄清产生这些超声波在磁性和MR流体中的传播特性的机制。

项目成果

期刊论文数量（29）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Ultrasonic Propagation in a Magnetic Fluid

超声波在磁流体中的传播

DOI：
发表时间：
2002
期刊：
Proceedings of the Third International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering
影响因子：
0
作者：
Masaaki Motozawa;Tatsuo Sawada
通讯作者：
Tatsuo Sawada

Masaaki Motozawa: "Characteristics of Ultrasound Propagation in a Magnetic Fluid under Uniform Magnetic Field"Proceedings of ASME FEDSM'03. (CD-Rom). 1-4 (2003)

Masaaki Motozawa：“均匀磁场下磁流体中超声波传播的特性”ASME FEDSM03 论文集。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

Velocity Profile Measurement of an Oscillating Pipe Flow of a Magnetic Fluid

磁流体振荡管流的速度剖面测量

DOI：
发表时间：
2003
期刊：
Proceedings of ASME FEDSM' 03, 4th ASME-JSME Joint Fluids Engineering Conference (CD-ROM)
影响因子：
0
作者：
Yuki Oshikawa;Takeshi Innami;Tatsuo Sawada
通讯作者：
Tatsuo Sawada

Yuki Oshikawa: "Velocity Profile Measurement of an Oscillating Pipe Flow of a Magnetic Fluid"Proceedings of ASME FEDSM'03. (CD-Rom). 1-5 (2003)

Yuki Oshikawa：“磁流体振荡管流的速度分布测量”ASME FEDSM03 论文集。