Computation of eddy currents in highly conductive particles dispersed in a moderately conductive matrix


Type
Conference Object
Change log
Authors
Rossa, Guillaume Barba 
Brun, Patrice 
Sauvage, Emilien 
Lacombe, Jacques 
Abstract

In this article, we report 3D numerical simulations of highly conductive non-magnetic particles dispersed in a moderately conductive matrix, subject to an AC magnetic field in a range of several hundred kHz. We address the issue of the scaling of current loops and heating power with respect to the volume fraction of the dispersed phase. Simulations are performed in two steps. First, a static electric potential gradient is imposed between two opposite faces of the simulation domain and an effective conductivity is computed in good agreement with percolation models. Second, the particles are constrained in a spherical sub-region and an AC magnetic field is imposed at the boundary of the domain. For small volume fractions, the induced Joule power is in good agreement with an analytical model of dilute dispersions. As the volume fraction increases, wider current loops form, until the percolation threshold is reached. Then the induced power in the spherical aggregate is well described by the power induced in an equivalent sphere with a volume-fraction-dependent conductivity.

Description
Keywords
Particles, eddy currents, heating power, effective conductivity
Journal Title
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
Conference Name
International Conference on Heating by Electromagnetic Sources
Journal ISSN
1383-5416
1875-8800
Volume Title
53
Publisher
IOS Press