1. Spatial thermal uniformity
1.1 Uniform heat treatment
When using dielectric hysteresis, the appearance of rapid heating and high thermal efficiency, resulting from the concentration of most of the energy within the materials, is deceived by the energy balance. The higher the electromagnetic power degraded into heat, the faster the temperature rise, of course. This first appearance comes from the use, for over sixty years now, of "microwave ovens", usually in the kilowatt range and used to raise the temperature by around fifty degrees, of quantities of foodstuffs of the order of 0.1 kg. The duration of such operations is of the order of a minute, i.e. a temperature increment of the order of 1 K · s –1 , even with a poor efficiency of the order of 0.35. The power density...
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Spatial thermal uniformity
Creating uniform heat sources
Bibliography
Patents
DELAUNAY (D.), JULLIEN (H.), MORÉ (C.), OUTIFA (L.), DELMOTTE (M.) and MAESTRALI (B.). – Device for microwave treatment of materials. Patent FR2720971 (1994).
DELMOTTE (M.), OUTIFA (L.), MORÉ (C.) and JULLIEN (H.). – Process and device for homogeneous microwave treatment of materials. Patent FR2709912 (1993).
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COMSOL Multiphysics Versions 3.1 or 4.1 from COMSOL. Microwave module required http://www.comsol.fr
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