Abstract
Nonthermal effects that are originated in the properties of microwave irradiation were analyzed during the drying process of biological materials. In order to show and optimize the possible influence of nonthermal phenomena, two types of experimental apparatuses were built, by means of which the polarity and the jet pressure phenomena could be investigated. It was found that the enhancing effect of the polarity can be described by using the appropriately modified Lambert type distance and cosine law, and the nonthermal effect coming from the absorption mechanism of microwaves follows the Lebedev type jet pressure theory, with some amendments. Experiments proved that both the parallel polarity and jet pressure phenomenon can improve the dehydration intensity; however, these effects strongly depend on the material features to be dried.
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