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Modeling microwave and hybrid heating processes including heat radiation effects

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2 Author(s)
Haala, J. ; Marc:oni Commun. Software Syst., Backnang, Germany ; Wiesbeck, W.

This paper presents an efficient simulation tool for conventional, microwave, and combined heating. Two heat-transfer mechanisms are included: conductive and radiant heat transfer. The conductive heat transfer is modeled by a finite-difference algorithm. A modeling technique for radiant heat transfer in nonuniform grids has been developed and is here presented for the first time. For the radiant heat transfer a finite-difference scheme is not applicable, as radiation from a material surface; is not bounded to the immediate vicinity, as is conductive heat transfer. Therefore, ray optical methods are used. Rays connecting mutually visible surfaces are obtained by a new fast method. Necessary, but acceptable simplifications allow fast computations. The algorithms are integrated conveniently together with an electromagnetic finite-difference time-domain program to one simulation tool. Representative simulations are presented for an oven heated conventionally, by microwaves, and by a combination of both

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:50 ,  Issue: 5 )

Date of Publication:

May 2002

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