Equivalent electromagnetic constants for microwave application to composite materials for the multi-scale problem

Keisuke Fujisaki, Tomoyuki Ikeda

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

To connect different scale models in the multi-scale problem of microwave use, equivalent material constants were researched numerically by a three-dimensional electromagnetic field, taking into account eddy current and displacement current. A volume averaged method and a standing wave method were used to introduce the equivalent material constants; water particles and aluminum particles are used as composite materials. Consumed electrical power is used for the evaluation. Water particles have the same equivalent material constants for both methods; the same electrical power is obtained for both the precise model (micro-model) and the homogeneous model (macro-model). However, aluminum particles have dissimilar equivalent material constants for both methods; different electric power is obtained for both models. The varying electromagnetic phenomena are derived from the expression of eddy current. For small electrical conductivity such as water, the macro-current which flows in the macro-model and the micro-current which flows in the micro-model express the same electromagnetic phenomena. However, for large electrical conductivity such as aluminum, the macro-current and micro-current express different electromagnetic phenomena. The eddy current which is observed in the micro-model is not expressed by the macro-model. Therefore, the equivalent material constant derived from the volume averaged method and the standing wave method is applicable to water with a small electrical conductivity, although not applicable to aluminum with a large electrical conductivity.

Original languageEnglish
Pages (from-to)5367-5381
Number of pages15
JournalMaterials
Volume6
Issue number11
DOIs
Publication statusPublished - 2013 Dec 5

Keywords

  • Eddy current
  • Electrical conductivity
  • Equivalent material constant
  • Multi-scale

ASJC Scopus subject areas

  • Materials Science(all)

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