Effect of External Magnetic Field on Ultrasonic Propagation Velocity in Magnetic Fluids(<Special Issue>Advanced Fusion of Functional Fluids Engineering)
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概要
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Experimental results for the properties of ultrasonic propagation velocity in kerosenebased and water-based magnetic fluids are reported. Ultrasonic wave frequencies of 1 MHz, 2 MHz and 4 MHz are used and the measurement scheme is based on the pulse method. The external magnetic field intensity is varied from 0mT to 550mT and the angle between the magnetic field direction and the direction of ultrasonic wave propagation is varied from 0°to 90°. The ultrasonic propagation velocity in magnetic fluids is dependent on temperature, elapsed time of applying the magnetic field, and magnetic field intensity. Hysteresis and anisotropy of ultrasonic propagation velocity are observed. These interesting results seem to be related to chain-like cluster formation in the magnetic fluids and the characteristic period of Brownian motion of the magnetic particles.
- 一般社団法人日本機械学会の論文
- 2005-08-15
著者
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SAWADA Tatsuo
Department of Mechanical Engineering, Keio University
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澤田 達男
慶大理工
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MATSUMOTO Yoshiyuki
Department of Applied Biochemistry, Tokai University
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MOTOZAWA Masaaki
Department of Mechanical Engineering, Keio University
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Sawada Tatsuo
Department Of Mechanical Engineering Keio University
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Motozawa Masaaki
Department Of Mechanical Engineering Keio University
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澤田 達男
慶應義塾大学理工学部
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Matsumoto Yoshiyuki
Department Of Mechanical Engineering Keio University
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Matsumoto Yoshiyuki
Department Electrical And Mechanical Engineering Faculty Of Science And Technology Kinki University
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