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Magnetic Field Effect on Thermal, Dielectric, and Viscous Properties of a Transformer Oil-Based Magnetic Nanofluid

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  • Michal Rajnak

    (Institute of Experimental Physics SAS, Watsonova 47, 04001 Kosice, Slovakia
    Faculty of Electrical Engineering and Informatics, Technical University of Kosice, Letna 9, 04200 Kosice, Slovakia)

  • Zan Wu

    (Department of Energy Sciences, Lund University, 22100 Lund, Sweden)

  • Bystrik Dolnik

    (Faculty of Electrical Engineering and Informatics, Technical University of Kosice, Letna 9, 04200 Kosice, Slovakia)

  • Katarina Paulovicova

    (Institute of Experimental Physics SAS, Watsonova 47, 04001 Kosice, Slovakia)

  • Jana Tothova

    (Faculty of Electrical Engineering and Informatics, Technical University of Kosice, Letna 9, 04200 Kosice, Slovakia)

  • Roman Cimbala

    (Faculty of Electrical Engineering and Informatics, Technical University of Kosice, Letna 9, 04200 Kosice, Slovakia)

  • Juraj Kurimský

    (Faculty of Electrical Engineering and Informatics, Technical University of Kosice, Letna 9, 04200 Kosice, Slovakia)

  • Peter Kopcansky

    (Institute of Experimental Physics SAS, Watsonova 47, 04001 Kosice, Slovakia)

  • Bengt Sunden

    (Department of Energy Sciences, Lund University, 22100 Lund, Sweden)

  • Lars Wadsö

    (Division of Building Materials, Lund University, 22100 Lund, Sweden)

  • Milan Timko

    (Institute of Experimental Physics SAS, Watsonova 47, 04001 Kosice, Slovakia)

Abstract

Progress in electrical engineering puts a greater demand on the cooling and insulating properties of liquid media, such as transformer oils. To enhance their performance, researchers develop various nanofluids based on transformer oils. In this study, we focus on novel commercial transformer oil and a magnetic nanofluid containing iron oxide nanoparticles. Three key properties are experimentally investigated in this paper. Thermal conductivity was studied by a transient plane source method dependent on the magnetic volume fraction and external magnetic field. It is shown that the classical effective medium theory, such as the Maxwell model, fails to explain the obtained results. We highlight the importance of the magnetic field distribution and the location of the thermal conductivity sensor in the analysis of the anisotropic thermal conductivity. Dielectric permittivity of the magnetic nanofluid, dependent on electric field frequency and magnetic volume fraction, was measured by an LCR meter. The measurements were carried out in thin sample cells yielding unusual magneto-dielectric anisotropy, which was dependent on the magnetic volume fraction. Finally, the viscosity of the studied magnetic fluid was experimentally studied by means of a rheometer with a magneto-rheological device. The measurements proved the magneto-viscous effect, which intensifies with increasing magnetic volume fraction.

Suggested Citation

  • Michal Rajnak & Zan Wu & Bystrik Dolnik & Katarina Paulovicova & Jana Tothova & Roman Cimbala & Juraj Kurimský & Peter Kopcansky & Bengt Sunden & Lars Wadsö & Milan Timko, 2019. "Magnetic Field Effect on Thermal, Dielectric, and Viscous Properties of a Transformer Oil-Based Magnetic Nanofluid," Energies, MDPI, vol. 12(23), pages 1-11, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:23:p:4532-:d:291851
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    References listed on IDEAS

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    1. Xiaobo Wang & Chao Tang & Bo Huang & Jian Hao & George Chen, 2018. "Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers," Energies, MDPI, vol. 11(3), pages 1-31, February.
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    Cited by:

    1. Victor I. Bolobov & Il’nur U. Latipov & Valentin S. Zhukov & Gregory G. Popov, 2023. "Using the Magnetic Anisotropy Method to Determine Hydrogenated Sections of a Steel Pipeline," Energies, MDPI, vol. 16(15), pages 1-15, July.
    2. Patrice Estellé & Leonor Hernández López & Matthias H. Buschmann, 2020. "Special Issue of the 1st International Conference on Nanofluids (ICNf19)," Energies, MDPI, vol. 13(9), pages 1-4, May.

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