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Theory of Sublinear Power Dependence of Microwave Heating in Some Ceramic Materials

Published online by Cambridge University Press:  25 February 2011

V. M. Kenkre ,
M. Kus  and
J. D. Katz
V. M. Kenkre
Affiliation:
Department of Physics and Center for MicroEngineered Ceramics, University of New Mexico, Albuquerque, NM 87131
M. Kus
Affiliation:
Department of Physics and Center for MicroEngineered Ceramics, University of New Mexico, Albuquerque, NM 87131
J. D. Katz
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87475
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Abstract

A sublinear dependence of the microwave heating rate on the incident microwave power implying a saturation effect appears to have been observed recently. We present simple model calculations to address this observation on the basis of an idea of spatial confinement of the absorbing charges in grain boundary regions. Two natural lengths exist in this model: the spatial extent of the confining region, and the maximum distance an absorbing charge travels under the combined action of damping and of the oscillating microwave field. We suggest that a mismatch of these lengths results in the observed saturation, more generally, in the observed decrease in absorption efficiency.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 269: Symposium L – Microwave Processing of Materials III , 1992 , 145
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

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