Abstract
The temperature dependence of the particle size distribution (PSD) of a transformer oil-based ferrofluid was studied using an ultrasound method. The measurements of the ultrasound velocity and attenuation were carried out in the absence of an external magnetic field as a function of the volume concentration of magnetite particles at temperatures ranging from 10 °C to 80 °C. The experimental results of ultrasound measurements were analyzed within the framework of the Vinogradov–Isakovich theory which takes into account contributions to acoustical parameters due to friction and heat exchange between magnetic particles and the surrounding carrier liquid. From the best fit of the experimental results and theoretical predictions, the parameters characterizing the PSD at different temperatures were determined. In order to analyze ultrasonic data, the density and viscosity of ferrofluid samples and the transformer oil were also measured.
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Acknowledgments
The studies were supported by the Polish Ministry of Science and Higher Education Grant N202 097 32/2406. The authors gratefully acknowledge Professor Milan Timko from the Slovak Academy of Science (Košice) for samples of the magnetic fluid.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Józefczak, A., Hornowski, T. & Skumiel, A. Temperature Dependence of Particle Size Distribution in Transformer Oil-Based Ferrofluid. Int J Thermophys 32, 795–806 (2011). https://doi.org/10.1007/s10765-010-0895-5
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DOI: https://doi.org/10.1007/s10765-010-0895-5