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Measurement of Absorbed Power of Glass Particle Layer on Moisture Content and Drying Rate by Combined Convective and Microwave Drying |
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| Authors: | Hironobu Imakoma Daisuke Katsura Kazuhiko Kawamura Hiroyuki Iyota Nobuya Nishimura |
| Affiliation: | a Department of Chemical Science and Engineering, Kobe University, Hyogo, Japanb Energy Applications R&D Center, Research and Development Bureau, Chubu Electric Power Co. Inc., Aich, Japanc Department of Mechanical Engineering, Osaka City University, Osaka, Japan |
| Abstract: | Dependency of absorbed power by microwave on the local moisture content in a glass particle layer was measured with a new method; that is, heating the wet layer. The heating experiment was performed using a laboratory-scale combined convective and microwave heater/dryer that was manufactured by modifying a domestic microwave oven at 2.45 GHz. The measured result was strongly dependent on the local moisture content and showed a maximum and a minimum within the measured range of the moisture content. This dependency can be explained by the assumption that moisture in the wet layer behaves as a mass of the free water. The combined drying rate of the wet layer measured with the heater/dryer was simulated with both the power dependency and the experimental convective-only drying rate. Power dependency on temperature is as important as the moisture content in the simulation. Simulated results agree very well with experimental ones. |
| Keywords: | Absorbed power Microwave drying Convective drying Combined drying Moisture content Glass particle layer |
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