Utilization of the magnetogranulometric analysis to estimate the thermal conductivity of magnetic fluids

Holotescu, Sorin; Stoian, Floriana D.; Marinică, Oana; Kubičár, Ľ.; Kopčanský, P.; Τimko, M.

doi:10.1016/j.jmmm.2010.11.043

Cited by 8 publications

(3 citation statements)

References 21 publications

(29 reference statements)

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“…This model, confirmed by the experimental data [57], was applied to determine the thermal conductivity of the analyzed magnetic nanofluid sample. The results (at room temperature) are given in Table 6, and we observe that the addition of magnetite nanoparticles alone is increasing the thermal conductivity of the magnetic nanofluid.…”

Section: Thermal Conductivitymentioning

confidence: 78%

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Nanofluid with Colloidal Magnetic Fe3O4 Nanoparticles and Its Applications in Electrical Engineering

Pîslaru‐Dănescu¹,

Ţelipan²,

Stoian³

et al. 2017

Nanofluid Heat and Mass Transfer in Engineering Problems

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In this study, we propose a new type of a cooling agent based on magnetic nanofluid for the purpose of replacing the classical cooling fluids in electrical power transformers. The magnetite (Fe 3 O 4 ) nanoparticles were synthesized by the co-precipitation method from an aqueous medium of salts FeCl 3 x6H 2 O and FeSO 4 x7H 2 O in the molar ratio Fe 3+ /Fe 2+ = 2:1, by alkalization with 10% aqueous solution of NaOH at 80°C, for 1 h. The size of the magnetite nanoparticles, as measured by X-ray diffraction method, was 14 nm and by scanning electron microscopy (SEM), they are between 10 and 30 nm. Magnetite powder was placed in oleic acid as a surfactant to prevent agglomeration of nanoparticles. The resulting mixture was dispersed in transformer oil UTR 40, with the role of carrier liquid. The magnetic, rheological, thermal and electrical characteristic properties of the obtained Fe 3 O 4 transformer oil-based nanofluid were determined. A mathematical model and numerical simulation results are very useful for investigating the heat transfer performances of the magnetic nanofluid. Based on this study, it was tested the cooling performance of this magnetic nanofluid for two types of electrical power transformers as compared to classical methods. We also presented a microactuator based on the same magnetic nanofluid.

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Section: Thermal Conductivitymentioning

confidence: 78%

“…The expression for the effective thermal conductivity of the Holotescu-Stoian model, rel. (17), in the case of a magnetic nanofluid is [57],…”

Section: Thermal Conductivitymentioning

confidence: 99%

Nanofluid with Colloidal Magnetic Fe3O4 Nanoparticles and Its Applications in Electrical Engineering

Pîslaru‐Dănescu¹,

Ţelipan²,

Stoian³

et al. 2017

Nanofluid Heat and Mass Transfer in Engineering Problems

View full text Add to dashboard Cite

show abstract

“…The saturation magnetization measured by VSM was 2.78 kA/m, 4.93 kA/m, 7.71 kA/m, and 9.07 kA/m for 1.62%, 2.15%, 2.69%, and 3.03%, respectively. The additional basic physical properties are given in [12].…”

Section: Resultsmentioning

confidence: 99%

Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids

et al. 2012

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This contribution is devoted to study of dielectric and magnetodielectric properties in transformer oil based magnetic uid. The dielectric permittivity and their anisotropy at various mutual orientation electric (50 Hz) and magnetic eld were shown at the dierent volume concentrations of nanoparticles at room temperature. The linear increase of dielectric constant with volume concentration was conrmed which is in good agreement with the theoretical Maxwell prediction. The dielectric anisotropy factor g(B, ω) is very close to g = 1. The values of permittivity increased with the increase of volume fraction of magnetite nanoparticles. The highest value of anisotropy characterized by deviation of permittivity ∆ε = ε ∥ − ε ⊥ was found for the highest volume concentration which could mean that no aggregation of magnetite nanoparticles had appeared.

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Study of Thermophysical Properties of Silver Nanofluids by ISS-HD, Hot Ball and IPPE Techniques

et al. 2015

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Utilization of the magnetogranulometric analysis to estimate the thermal conductivity of magnetic fluids

Cited by 8 publications

References 21 publications

Nanofluid with Colloidal Magnetic Fe3O4 Nanoparticles and Its Applications in Electrical Engineering

Nanofluid with Colloidal Magnetic Fe3O4 Nanoparticles and Its Applications in Electrical Engineering

Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids

Study of Thermophysical Properties of Silver Nanofluids by ISS-HD, Hot Ball and IPPE Techniques

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