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Title: Effect of Aspect Ratio on the Permittivity of Graphite Fiber in Microwave Heating
Authors: Fukushima, Jun
Tsubaki, Shuntaro
Matsuzawa, Tomoki
Kashimura, Keiichiro
Mitani, Tomohiko  kyouindb  KAKEN_id
Namioka, Tomoaki
Fujii, Satoshi
Shinohara, Naoki  kyouindb  KAKEN_id
Takizawa, Hirotsugu
Wada, Yuji
Author's alias: 三谷, 友彦
篠原, 真毅
Keywords: microwave heating
electrical permittivity
shape effect
Issue Date: 22-Jan-2018
Publisher: MDPI AG
Journal title: Materials
Volume: 11
Issue: 1
Thesis number: 169
Abstract: Microwave (MW) heating has received attention as a new heating source for various industrial processes. Some materials are expected to be a more effective absorber of MW, and graphite is observed as a possible candidate for high-temperature application. We investigated the dependence of the aspect ratio of graphite fibers on both their heating behavior and permittivity under a 2.45 GHz MW electric field. In these experiments, both loss tangent and MW heating behavior indicated that the MW absorption of conductive fibers increases with their aspect ratio. The MW absorption was found to be well accounted for by the application of a spheroidal model for a single fiber. The absorption of graphite fibers decreases with increasing aspect ratio when the long axis of the ellipsoid is perpendicular to the electric field, whereas it increases with the aspect ratio when the long axis is parallel to the electric field. The analytical model indicated that MW heating of the conductive fibers is expected to depend on both the shape and arrangement of the fibers in the electric field.
Rights: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
DOI(Published Version): 10.3390/ma11010169
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