TY - JOUR
T1 - The influence of magnetic field swept rate on the ultrasonic propagation velocity of magnetorheological fluids
AU - Bramantya, M. A.
AU - Sawada, T.
N1 - Funding Information:
We would like to thank Mr. Jun Kuroiwa and Mr. Yuta Suzuki of Keio University for his work and collaboration on the experiment. This work was partially supported by ASEAN University Network – Southeast Asia Engineering Education Development Network Project from the Japan International Cooperation Agency and Keio University .
PY - 2011/5
Y1 - 2011/5
N2 - Structure of magnetorheological (MR) fluids depends on the strength of the magnetic field applied and on the mode of its application. The ultrasonic wave propagation velocity changes under the effect of an external magnetic field as a result of formation of clusters arranged along the direction of the field in the MR fluids. Therefore, we propose a qualitative analysis of these clustering structures by measuring properties of ultrasonic propagation. Since the MR fluids are opaque, the non-contact inspection using this ultrasonic technique can be very useful. In this study, we measured ultrasonic propagation velocity in MR fluid influenced by an external magnetic field for different swept rate precisely. With increasing magnetic field intensity, the changes of the ultrasonic wave velocity are more pronounced. Sedimentation effect takes place in certain time for different swept rate due to magnetic particle size and it follows linear relationship in log scale. Significant differences of the ultrasonic wave velocity are established between the case when the field is swept at a constant rate and the case when it is stepped up.
AB - Structure of magnetorheological (MR) fluids depends on the strength of the magnetic field applied and on the mode of its application. The ultrasonic wave propagation velocity changes under the effect of an external magnetic field as a result of formation of clusters arranged along the direction of the field in the MR fluids. Therefore, we propose a qualitative analysis of these clustering structures by measuring properties of ultrasonic propagation. Since the MR fluids are opaque, the non-contact inspection using this ultrasonic technique can be very useful. In this study, we measured ultrasonic propagation velocity in MR fluid influenced by an external magnetic field for different swept rate precisely. With increasing magnetic field intensity, the changes of the ultrasonic wave velocity are more pronounced. Sedimentation effect takes place in certain time for different swept rate due to magnetic particle size and it follows linear relationship in log scale. Significant differences of the ultrasonic wave velocity are established between the case when the field is swept at a constant rate and the case when it is stepped up.
KW - Cluster formation
KW - Magnetorheological fluid
KW - Swept rate
KW - Ultrasonic
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U2 - 10.1016/j.jmmm.2010.11.040
DO - 10.1016/j.jmmm.2010.11.040
M3 - Article
AN - SCOPUS:79952193168
SN - 0304-8853
VL - 323
SP - 1330
EP - 1333
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 10
ER -