Ultrasonic propagation properties in magnetic functional fluids under magnetic fields

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Magnetic fluids(MF) and magnetorheological fluids(MRF) are stable colloidal dispersion of small magnetic particles in a liquid carrier. When an external magnetic field is applied to an MF or MRF, some of the inner particles coagulate and form a clustering structure. Usual conventional measuring technique cannot be applied because MF and MRF are opaque. In this study, measurement of ultrasonic propagation velocity in each of MF and MRF were reported precisely. Based on these results, the clustering structures of these fluids were analyzed and the application of non-contact inspection in these fluids by ultrasonic techniques was discussed.