TY - JOUR
T1 - Effect of aspect ratio on the permittivity of graphite fiber in microwave heating
AU - Fukushima, Jun
AU - Tsubaki, Shuntaro
AU - Matsuzawa, Tomoki
AU - Kashimura, Keiichiro
AU - Mitani, Tomohiko
AU - Namioka, Tomoaki
AU - Fujii, Satoshi
AU - Shinohara, Naoki
AU - Takizawa, Hirotsugu
AU - Wada, Yuji
N1 - Funding Information:
K.K. is very grateful to Motohiko Tanaka, Masanori Hashiguchi, Takashi Watanabe, Toshiki Ishikawa, and Motoyashu Sato for their helpful discussions. This work was supported by the Research Institute for Sustainable Humanosphere, Kyoto University (Project: Adam, Mission Research), by Tokyo Medical and Dental University, and by IKETANI Zaidan and CREST, JST Japan Science and Technology Cooperation.
Funding Information:
Acknowledgments: K.K. is very grateful to Motohiko Tanaka, Masanori Hashiguchi, Takashi Watanabe, Toshiki TIsohsihkiakwi Ias,h ainkdawMao, taonydasMhuotSoaytaoshfour Sthaetoirf hoerltphfeuilr dhieslcpufsusliodnissc.uTshsiiso wnso.rTkhwisaws sourkppwoarstesdu bpypothrtee RdebsyeatrhcehR Inessetiatructhe for Sustainable Humanosphere, Kyoto University (Project: Adam, Mission Research), by Tokyo Medical and Dental University, and by IKETANI Zaidan and CREST, JST Japan Science and Technology Cooperation.
Publisher Copyright:
© 2018 by the authors.
PY - 2018/1/22
Y1 - 2018/1/22
N2 - 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 ofMW, 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.
AB - 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 ofMW, 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.
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U2 - 10.3390/ma11010169
DO - 10.3390/ma11010169
M3 - Article
AN - SCOPUS:85040830339
VL - 11
JO - Materials
JF - Materials
SN - 1996-1944
IS - 1
M1 - 169
ER -