Influence of electric field upon the formation of particles cluster in magnetic fluid

Yerin, Constantine V.; Padalka, V. V.

doi:10.1016/j.jmmm.2004.11.031

Cited by 19 publications

(4 citation statements)

References 1 publication

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“…The above mentioned results lead to a conclusion that the particle aggregation has an adverse effect on the breakdown voltage of transformer oil but the reversible nanoparticle aggregation induced by electric field may have positive impact on breakdown voltage of transformer oil. This induced aggregation may be more effective in capturing the free electrons, reducing their mobility, leading to slower streamer formation and hence improving the breakdown voltages [68][69][70][71].…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Rafiq

2016

Journal of Nanomaterials

132

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The mineral oil or synthetic oil in conjunction with paper is mainly being applied as dielectric medium in many of the high voltage apparatus. However, the advent of high voltage levels such high voltage alternating current (HVAC) and high voltage direct current (HVDC) has prompted researchers to direct their focus onto an insulation system which can bear the rising high voltage levels. The modern insulating liquid material development is guided by various factors such as high electrical insulation requirements and other safety and economic considerations. Therefore transformer manufacturer companies have to design transformers with these new specific requirements. The transformer oil-based nanofluids with improved dielectric and thermal properties have the potential to replace mineral oil base products in the market place. They are favorable because they function more superior than mineral oil and they contribute definite insulating and thermal gains. This paper reviews recent status of nanofluids use as transformer oils. The nanofluids used as transformer oils are presented and their advantages are described in comparison with mineral oil. The multiple experimental works carried out by different researchers are described, providing an overview of the current research conducted on nanofluids. In addition scope and challenges being confronted in this area of research are clearly presented.

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Section: Journal Of Nanomaterialsmentioning

confidence: 99%

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Rafiq

2016

Journal of Nanomaterials

132

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“…Magnetic field applied perpendicular to electric field decreases the permittivity of a magnetic liquid but magnetic field applied parallel to electric field increases the permittivity of a magnetic liquid [4]. It is known that also high electric fields initiate cluster formation [5]. The motivation of this work is to investigate dielectric properties of magnetic liquids in high electric fields in the presence of a magnetic field that usually occurs in transformers.…”

Section: Introductionmentioning

confidence: 99%

Breakdown and partial discharges in magnetic liquids

Herchl

Marton

Tomčo

et al. 2008

J. Phys.: Condens. Matter

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The dielectric properties (permittivity, loss factor, dielectric breakdown strength) of magnetic liquids were investigated. The magnetic liquids were composed of magnetite particles coated with oleic acid as surfactant and dispersed in transformer oil. To determine their dielectric properties they were subjected to a uniform magnetic field at high alternating electric fields up to 14 MV m(-1). Nearly constant permittivity of magnetic liquid with particle volume concentration Φ = 0.0019 as a function of electric field was observed. Magnetic liquids with concentrations Φ = 0.019 and 0.032 showed significant changes of permittivity and loss factor dependent on electric and magnetic fields. The best concentration of magnetic fluid was found at which partial current impulse magnitudes were the lowest. The breakdown strength distribution of the magnetic liquid with Φ = 0.0025 was fitted with the Duxbury-Leath, Weibull and Gauss distribution functions.

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“…It allows one to speak about the considerable role of nanoparticles aggregates in magnetooptical effects in magnetic colloids. The comparison of the equations ( 6) and (7) shows that the solution of the problem of defining the distribution function of particle sizes from the data of the magnetic birefringence essentially depends on the physical mechanism of particles orientation accepted in calculations (the presence of prevailing permanent or induced magnetic moments). The additional information on the type and quantity of magnetic moments of particles and aggregates is necessary for the correct solution of the problem.…”

Section: Resultsmentioning

confidence: 99%

Optical Properties of Aggregated Magnetic Fluid: Birefringence and Light Scattering

Yerin

2015

SSP

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The optical properties of colloidal solutions of nanosized magnetite particles in kerosene were studied by optical methods (birefringence and light scattering). The data on the birefringence kinetics in nonstationary magnetic fields is used to determine the size distribution of magnetite particles and aggregates. It is shown that the particle size distribution essentially depends on the type of magnetic moments of the particles and aggregates. Static and dynamic light scattering experiments confirm the conclusion about the existence of a significant fraction of nanoparticles in the form of aggregates with sizes of several tens of nanometers.

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Influence of electric field upon the formation of particles cluster in magnetic fluid

Cited by 19 publications

References 1 publication

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Breakdown and partial discharges in magnetic liquids

Optical Properties of Aggregated Magnetic Fluid: Birefringence and Light Scattering

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