Abstract
In the case of sterilizing foods by microwave heating, uneven heating is occurd inside heated foods. It is problem that unheated part occurs shortage of sterilization and overheated part occurs deterioration of foods. In this paper, uniform heating technique by arranging dielectric material is proposed, by applying previously-reported technique which using distilled water. By using the method, sterilizing food in arid condition become possible. And change of complex permittivity and thickness of material can control absorbed power distribution inside the food. We estimated this technique by focus on absorbed power inside the food and power loss inside dielectric material. As a result, uniform heating of food is achieved by arranging high-permittivity dielectric. But, high-permittivity dielectirc deteriorate heating efficiency because of increase of power loss inside dielectric material. There is trade-off between uniform heating and heating efficiency. It is considerd that an optimal value of dielectric constant and thickness is exist.
