Alexander Sandulyak

MIREA - Russian Technological University

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A. A. Sandulyak

MIREA - Russian Technological University

D. A. Sandulyak

MIREA - Russian Technological University

ВА

В. А. Ершова

Samara National Research University

МН

М. Н. Полисмакова

MIREA - Russian Technological University

A. A. Sandulyak

MIREA - Russian Technological University

ДО

Д. О. Киселев

MIREA - Russian Technological University

Ershova Vera

Moscow Polytechnic University

Sandulyak Anna

MIREA - Russian Technological University

Polismakova Maria

MIREA - Russian Technological University

Marina V. Shitikova

Moscow State University of Civil Engineering

Cooperative Institutions

MIREA - Russian Technological University

Moscow State Technological University

Lomonosov Moscow State University

Moscow Polytechnic University

Moscow State University of Civil Engineering

University of Hull

Russian New University

Murmansk State Technical University

Moscow State University

Russian Academy of Sciences

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The Regular Pattern of Demagnetizing Factor Behaviour of Various ‘Cores’ of Granule-Ball Chains

Advanced materials research (2015)

Alexander Sandulyak A. A. Sandulyak В. А. Ершова Petr Shkatov

We analyze previously not studied issue on the value, nature and manifestation f a demagnetizing factor of effective channels-magnets formed in magnetized granular media by the chains of contacting granules. We provide the factor values for conditionally defined quasi-solid cores of the channels varying in length and diameter, as well as a corresponding consolidating expression which turned out to be exponential with such an argument as the radical of the core relative size. We emphasize full agreement of this expression with the one for a granular medium, i.e. the medium consisting, basically, of the effective channels bundle according to the developed theory of channel-by-channel (selective) magnetization of granular ferro-magnetic media used, e.g. as operating elements in versatile magnetic separators.

Granule (geology)

10.4028/www.scientific.net/amr.1083.75

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Study of Ferromagnetic Dispersed Samples and Particles Magnetic Susceptibility by Faraday Method (Magnetometer with Polar Hemispheres)

WSEAS Transactions on Systems and Control archive (2017)

Sandulyak Anna Sandulyak Daria Ershova Vera Alexander Sandulyak Polismakova Maria

To study the magnetic susceptibility of samples (in particular, dispersed ones), a Faraday magnetometer version with pole-hemispherical tips is preferred. The approach to identification of the gradient stability zone (for positioning small samples) is shown: by the obtained coordinate characteristic of induction (meandering, with the possibility of an objective linear approximation of its section in the vicinity of the inflection) and the coordinate characteristic of the gradient – with stable gradient values in the vicinity of the extremum. Experimental data on the magnetic susceptibility of dispersed samples containing a dispersed phase of magnetite particles revealed a nonlinear character of the dependence of their susceptibility on the volume fraction of this phase – with an almost linear initial section. The possibility of obtaining information on the susceptibility of the particles themselves using data for this region is discussed, in the range of a volume fraction up to 0.2, and to increase the accuracy of such information to 0.02-0.05 (narrowed range), where the concentration dependences of the susceptibility of dispersed samples obey an independent linear trend.

Faraday cage

Volume fraction

Source

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Possibility of Block Grouping of Magnetic Inspection Operations for Iron Impurities in Oils and Cutting Fluids

Lecture notes in mechanical engineering (2019)

Alexander Sandulyak A. A. Sandulyak В. А. Ершова

10.1007/978-3-030-16943-5_14

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Concentrated dispersed magnet with different relative lengths: Basic properties and characteristics (on the example of a polyspherical structure)

Mechanics of Advanced Materials and Structures (2021)

A. A. Sandulyak Alexander Sandulyak Marina V. Shitikova R. Yu. Tkachenko Daria A. Sandulyak

Attention is drawn to the lack of experimental data allowing one to judge the magnetic properties of concentrated disperse magnets with different values of the ratio of the cylindrical sample’s length L to its diameter D. Data have been obtained for magnetic induction, permeability, susceptibility, and magnetization for granular samples in the form of a backfill of ferromagnetic balls at different magnitudes of L/D (1–16). It has been found that within the accepted range of intensity of the magnetizing field equals 9–47 kA/m, the permeability and susceptibility correspond to values in the region of weakly expressed extrema of their field dependences and therefore are almost stable, while the field dependences of induction and magnetization demonstrate a noticeable (only with slightly decreasing intensity) growth, what indicates the absence of magnetic saturation of granular (as opposed to solid) magnets. It has been shown that with an increase in L/D the studied magnetic parameters grow to a certain value L/D = [L/D] (at L/D ≥ [L/D] the magnetic properties of the sample correspond to its potential magnetic properties, i.e. its quasi-solid material). For such samples, this transitional (to a certain extent criterion) value of L/D is [L/D] = 10–12, i.e. significantly lower than for solid samples, in particular, made of steel. The exponential dependence of the demagnetizing factor N of “short” samples (1 ≤ L/D < [L/D]) on such an argument as the power function L/D with an exponent of power equals 0.5–0.6.

Saturation (graph theory)

Exponent

10.1080/15376494.2021.1943575

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To the Conditions for Using Magnetic Susceptibility Data of Dispersed Materials to Determine the Susceptibility of Their Particles

Sandulyak Anna Sandulyak Darya Ershova Vera Polismakova Maria Alexander Sandulyak

Attention is drawn to the relevance of the problem not yet solved to date: about acquisition of data on the magnetic susceptibility χ of "isolated" magnetically active particles of small sizes, in particular, iron-containing particles present in loose and liquid media subjected to targeted magnetic action in industrial technologies, biotechnologies and to eliminate environmental problems. The approach proposed for this is based on obtaining data on the magnetic susceptibility of a sample of a dispersed material. The dispersed phase consists of iron-containing particles. The sample should be moderately rarefied. At the same time, the volume fraction of γ particles in the sample should not exceed such a (criteria) value γ = [γ], when the mutual separation of the particles is achieved, which practically eliminates their magnetic interaction. Then the value of χ can be additionally estimated from the relation. The desired value [γ] = 0.15…0.2 follows from the examples of informative concentration dependences of magnetic susceptibility for different dispersed samples with a dispersed phase, in particular, particles of natural magnetite, ferroimpurity particles (isolated from sugar and semolina), particles of a carbon sorbent modified (with inclusions of magnetite and maghemite).

Maghemite

Magnetism

Magnetic separation

10.1007/978-981-19-9825-6_4

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Criterion of the Relative Length of the Disperse Magnet when Determining its Potential Magnetic Properties

2021 International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT) (2021)

Alexander Sandulyak Sandulyak Anna Ershova Vera Sandulyak Daria Tkachenko Roman

Both types of magnets - homogeneous (solid) and inhomogeneous, particular dispersed, as backfills of ferromagnetic granules - are useful in various electromagnetic systems. Attention is drawn to the physically substantiated interconnections of the key magnetic parameters of "short" (having a demagnetizing factor) samples of magnets, such as magnetic induction, permeability, susceptibility, magnetization. It is noted that for calculating the susceptibility and magnetization of such samples, in addition to the data of their magnetic permeability required here, the data of the magnetic permeability of the sample material (obtained, for example, when studying the same in composition, but "long", sample) are mandatory. Using the corresponding calculated expressions, the data of these parameters are analyzed for dispersed samples (polyspherical, similar to quasisolid materials) in a magnetizing field with an intensity of up to 163 kA/m at different ratios of the length of the cylindrical sample to its diameter. It is shown that these samples become already sufficiently "long" when length to diameter is more than 10-12, while there are no signs of their magnetic saturation (including "long" samples). Dependences of the demagnetizing factor of such "short" samples on length to diameter are given for different intensity and corresponding values of the magnetic permeability of their quasisolid material - with the approximation of these dependences by functions of exponential form.

Saturation (graph theory)

Electromagnetic induction

Relative permeability

10.1109/icaect49130.2021.9392423

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Ferrous Material Fill: Magnetization Channels, Layer-by-Layer and Average Permeability, Element-to-Element Field

Advanced structured materials (2017)

A. A. Sandulyak D. A. Sandulyak В. А. Ершова Alexander Sandulyak

10.1007/978-981-10-6895-9_9

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On the Issue of Choosing the Measuring Zones in a Faraday Balance When Studying Magnetic Susceptibility of Small Samples

Lecture notes in electrical engineering (2017)

Alexander Sandulyak A. A. Sandulyak М. Н. Полисмакова В. А. Ершова D. A. Sandulyak

Line (geometry)

Faraday cage

Position (finance)

10.1007/978-3-319-53934-8_10

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Induction of the Field at Different Distances from the Permanent Magnet and Between Opposing Magnets. Testing of the Superposition Principle

International Journal of Innovative Technology and Exploring Engineering (2019)

М. Н. Полисмакова В. А. Ершова Alexander Sandulyak A. A. Sandulyak

The measurement data of the field induction at different distances from the permanent magnet Nd-Fe-B and between two equivalent magnets on distance are presented. It is shown that the obtained coordinate dependences are described by exponential function, but for a system of two magnets –only partially: up to the central area of the system and make 20-30% of the entire area between opposing magnets. Using the example of the coordinate dependence of induction for one of two identical magnets, it is shown that the use of the superposition principle makes it possible to obtain a coordinate dependence of induction between opposing magnets, which is equivalent to experimental one.

10.35940/ijitee.i3014.0789s319

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Use of the magnetic test-filter for magnetic control of ferroimpurities of fuels, oils, and other liquids (phenomenological and physical models)

Journal of Magnetism and Magnetic Materials (2016)

Sandulyak Anna Alexander Sandulyak Ershova Vera Polismakova Maria Sandulyak Darya

Phenomenological model

10.1016/j.jmmm.2016.10.137

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Citations (17)