Affiliations: [a] Department of Engineering Physics, Electronics and Mechanics, Nagoya Institute of Technology, Nagoya, Japan | [b] Department of Electrical and Control Systems Engineering, National Institute of Technology, Toyama College, Toyama, Japan
Correspondence:
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Corresponding author: Yasushi Ido, Department of Engineering Physics, Electronics and Mechanics, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan. E-mail:[email protected]
Abstract: Magnetorheological fluids containing nanometer size needle-like nonmagnetic
particles whose long axis is 194 nm and aspect ratio is 8.3 are prepared as
new magnetic functional fluids. Viscous properties of the fluids are
investigated experimentally. Shear stress and viscosity coefficient are
measured by using the rheometer which has the additional equipment for
measurement in the presence of magnetic field. When the total volume
fraction of the particles in the fluid is constant (0.30), larger amount of
needle-like particles in the fluid gives larger viscosity in the absence of
magnetic field. In the contrast, the viscosity and shear stress of the fluid
containing 4% needle-like nonmagnetic particles and 26% micrometer
sphere magnetic particles take large value than those of other fluids in the
presence of magnetic field.
Keywords: Magnetorheological fluid, needle-like particle, viscosity, damping force, magnetic interaction
