513 磁気機能性流体の内部構造変化と超音波伝播特性の関係(2)(OS5-3 機能性流体工学の先端融合化,OS5 機能性流体工学の先端融合化,オーガナイズドセッション)

概要

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Magnetic and MR fluids are typical functional fluids. When the magnetic field is applied to these fluids, some of inner particles form clustering structure. These clustering structures influence on the ultrasonic propagation in these fluids. We measured precisely the properties of ultrasonic propagation velocity and attenuation in these fluids subjected to the magnetic field. The measurement scheme is based on the pulse method. The external magnetic field intensity is varied from 0 mT to 550 mT and the angle between the magnetic field direction and the direction of ultrasonic wave propagation is varied from 0° to 90°. Some interesting properties of ultrasonic propagation such as hysteresis are observed. Based on the experimental results, the relationship between these ultrasonic propagation properties and inner structures of these fluids is discussed.
一般社団法人日本機械学会の論文
2007-11-17