Abstract
Changes in the shape of microdroplet aggregates exposed to an alternating magnetic field with frequency f from 0.01 to 400 Hz are experimentally studied. Microdroplet aggregates are spherical droplets of a highly concentrated magnetic fluid with a radius from one to several tens of microns dispersed in a liquid with a low concentration of magnetic particles. At f < 20 Hz, large-and small-amplitude forced oscillations of aggregates are observed. Small-amplitude oscillations are practically sinusoidal. Large-amplitude oscillations are of a periodical nonsinusoidal type with higher harmonics and subharmonics in the spectrum. A change in the character of forced oscillations with increasing strength of an external magnetic field is of the threshold type and occurs at the moment when the external field strength reaches a critical value, at which a microdroplet aggregate is elongated in a jumpwise manner and acquires a needle-like shape. The recovery of the spherical shape of a microdroplet aggregate after a sharp switching-off of the external magnetic field follows an aperiodic dependence.
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Original Russian Text © V.I. Drozdova, V.V. Kushnarev, G.V. Shagrova, 2006, published in Kolloidnyi Zhurnal, 2006, Vol. 68, No. 2, pp. 166–171.
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Drozdova, V.I., Kushnarev, V.V. & Shagrova, G.V. On forced oscillations of microdroplet aggregates in magnetic fluids. Colloid J 68, 142–147 (2006). https://doi.org/10.1134/S1061933X06020049
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DOI: https://doi.org/10.1134/S1061933X06020049