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Title:Analiza posedanja magnetno občutljivih mikrodelcev in določitev magnetne občutljivosti
Authors:ID Černec, Dean (Author)
ID Hriberšek, Matjaž (Mentor) More about this mentor... New window
ID Ravnik, Jure (Comentor)
Files:.pdf MAG_Cernec_Dean_2016.pdf (10,50 MB)
MD5: 6E3A747D8528355E0E1977D2A80EB649
 
Language:Slovenian
Work type:Master's thesis
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:Magistrska naloga podaja izsledke eksperimentov s posedanjem magnetno občutljivih mikrodelcev. Pri raziskavah, katerih namen je ugotavljanje različnih fizikalnih lastnosti delcev, se v praksi pogosto uporabljajo sedimentacijski procesi. Če se delci pri posedanju odzivajo tudi na delovanje zunanjega magnetnega polja, pa lahko določamo tudi njihove magnetne lastnosti. Začetne analize so bile narejene na podlagi eksperimentov s posedanjem steklenih kroglic, za kontrolo končnih hitrosti posedanja magnetno občutljivih delcev pa so se izvedli tudi eksperimenti s posedanjem brez vpliva magnetizma. Osrednji eksperiment je bil zasnovan tako, da smo v stekleni posodi, napolnjeni z vodo, spremljali posedanje magnetno občutljivih delcev, ko so se le-ti približevali magnetu na dnu posode in pri tem merili opravljeno pot delcev v posameznih časovnih intervalih. Zaznana sprememba hitrosti je posledica magnetne sile, ki deluje na obravnavan delec. Magnetna sila, ki deluje na delec, je odvisna od volumna delca, njegove magnetne občutljivosti ter gostote magnetnega pretoka in njenega gradienta v magnetnem polju, ki je bilo za uporabljen magnet izračunano na podlagi metode končnih elementov s programskim paketom FEMM 4.2. Magnetna občutljivost delca smo določali na podlagi enačbe ravnotežja sil, ki delujejo na magnetno občutljiv delec pri posedanju v magnetnem polju. Končni rezultat naloge so eksperimentalno določene vrednosti magnetnih občutljivosti različno velikih sferičnih delcev.
Keywords:posedanje, magnetno občutljivi mikrodelci, magnetna občutljivost, magnetno polje, gostota magnetnega pretoka, gradient gostote magnetnega pretoka
Place of publishing:Maribor
Publisher:[D. Černec]
Year of publishing:2016
PID:20.500.12556/DKUM-59795 New window
UDC:537.63:544.023.523(043.2)
COBISS.SI-ID:19894806 New window
NUK URN:URN:SI:UM:DK:G67DAPW0
Publication date in DKUM:29.06.2016
Views:1756
Downloads:127
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Secondary language

Language:English
Title:Analysis of Magnetic Microparticle Settlement and Determination of Magnetic Susceptibility
Abstract:Master thesis presents the results of experiments with magnetic microparticle settlement. Sedimentation processes are often used for determining physical properties of particles. When an external magnetic field is applied and the particles respond to it, magnetic properties of these particles can also be determined. On the basis of sedimentation experiments performed on glass spheres, preliminary analyses were made. To determine the settling velocity of magnetic microparticles, the experiments without applied magnetic filed were also performed. The main experiment was based on tracking the paths of magnetic particles in the respective time intervals as they were approaching the magnet on the bottom of glass container. The acceleration of particles was observed as a result of the magnetic force. Magnetic force on the magnetic particle depends on particle volume, magnetic susceptibility of particle, magnetic flux density and the magnetic flux density gradient in applied magnetic field. The magnetic field was computed with finite element package FEMM 4.2 for solving 2D planar and axisymmetric problems. Magnetic susceptibility was determined on the basis of force balance equations. The end result of master thesis is experimetal determination of magnetic susceptibilities of spherical particles of different sizes.
Keywords:sedimentation, magnetic microparticles, magnetic susceptibility, magnetic field, magnetic flux density, magnetic flux density gradient


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