1995 Fiscal Year Final Research Report Summary
Heat Transfer with Phase Change Problems Using microwave heating
| Project/Area Number |
06650235
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
AOKI Kazuo Nagaoka University of Technology, Department of Mechanical Engineering, Professor, 工学部, 教授 (60115095)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Microwave Heating / Ice Melting / Phase Change / Drying of Packed Beds / Electric and Magnetic Fields / Heat Conduction / Heat and mass transfer / Temperature Control |
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| Research Abstract |
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.
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