Heat Transfer with Phase Change Problems Using microwave heating

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Microwave heating is becoming one of the most interesting methods for heating materials. In particular, using microwave for the mixture of liquid and solid phases, major part of microwave is absorbed to the part of liquid phase and the heating is more selective.In this study, the melting of ice and the drying of unsaturated packed beds due to microwave heating have been investigated experimentally and theoretically. The results to obtained are summarized as follows.1) In the melting of layrs composed of ice and water by microwave heating, the direction of melting against the incident microwave strongly depends on the difference in the dielectric properties between water and ice. The melting of ice by microwave heating was analyzed based on the one dimensional model.2) For the melting of layred packed beds, the internal melting occurred. The melting process was found to depend on the intensity of incident microwave, dielectric constant and initial temperature of the layr.3) In the drying of unsaturated packed beds by microwave heating, the temperature in a dry layr drops as drying proceeds and a smaller diameter of particles results in a faster drying time because of having a higher capillary force.