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タイトル: | Effect of Aspect Ratio on the Permittivity of Graphite Fiber in Microwave Heating |
著者: | Fukushima, Jun Tsubaki, Shuntaro Matsuzawa, Tomoki Kashimura, Keiichiro Mitani, Tomohiko https://orcid.org/0000-0002-8544-2558 (unconfirmed) Namioka, Tomoaki Fujii, Satoshi Shinohara, Naoki Takizawa, Hirotsugu Wada, Yuji |
著者名の別形: | 三谷, 友彦 篠原, 真毅 |
キーワード: | microwave heating electrical permittivity graphite shape effect |
発行日: | 22-Jan-2018 |
出版者: | MDPI AG |
誌名: | Materials |
巻: | 11 |
号: | 1 |
論文番号: | 169 |
抄録: | 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. |
著作権等: | © 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). |
URI: | http://hdl.handle.net/2433/233949 |
DOI(出版社版): | 10.3390/ma11010169 |
PubMed ID: | 29361758 |
出現コレクション: | 学術雑誌掲載論文等 |
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