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Abstract
A novel type of cylindrical
applicator using a  mode for microwave heating of pumpable
materials in a tube is presented. A theoretical analysis of the field
configuration in the load and the applicator is given. Using this applicator,
zero field strength can be achieved at a given radial distance from the axis,
preferably coinciding with the pipe wall so that no buildup
of deposits or overheating of the product occurs at the tube wall. The
central concentration of the radial power density was experimentally
verified. Although the variations in the axial power distribution of the
investigated cavities were significant, they could be improved by changing
the coupling system. Computer programs were developed for the field
calculations and for studies of the influence of different parameters on the
heating performance. Among possible uses of the applicator are rapid heating
of heat-sensitive fluids containing suspended solids and heating of viscous
fluids as well as for extrusion cooking or coagulation of proteinous
foods.
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