TED-AJ03-373 DRYING OF LAYERED PACKED BEDS
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概要
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Many researches on drying of materials have been done so far. However, most of previous works dealt with the drying of uniform materials. In this paper, we have investigated the drying of layered packed beds due to convective heating theoretically and experimentally. The layered packed beds is classified in two configurations; F-C beds (attaching fine beds on coarse beds) and C-F beds (attaching fine beds under coarse beds). An experiment was executed by blowing heated air that is controlled at constant temperature and at constant water vapor concentration on the upper surface of the layered packed beds composed of spherical glass beads, water and air including water vapor. As spherical glass beads, we used the averaged particle size of 0.15mm (as fine packed bed) and 0.40mm (as coarse packed beds) in diameter. In order to calculate drying process of layered packed beds, one-dimensional drying model for layered packed beds has been presented, taking into account the water transport due to capillary action, the diffusion of water vapor and the latent heat transfer due to evaporation. After formation of dry layer, because of the moving boundary problem including phase change, the governing equations are numerically solved by using Landau transformation. In this study, we consider only layered packed beds that the volume of the upper layer and the lower layer is equal. The water saturation distributions in packed beds greatly differ depending on the structure of packed beds even if total volume of water that exists in the pore inside the packed beds is completely the same. Accordingly, the drying process strongly depends on the structure of layered packed beds. It was found that under the constant drying conditions, the drying rate of the F-C beds was faster than that of the C-F beds. This is because the moisture in the F-C beds is easily supplied into the surface beds due to capillary action. The predicted results, for the temperature distribution in packed beds and the drying rate, were in good agreement with the experimental results using packed beds composed of glass beads.[figure]
- 一般社団法人日本機械学会の論文
著者
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Aoki Kazuo
Department of Public Health and Hygiene, Oita Medical University
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Mikawa Takashi
Asahi Glass Co. Ltd.
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AKAHORI Masatoshi
Department of Mechanical Engineering, Nagaoka University of Technology
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RATANDECHO Phadungsak
Department of Mechanical Engineering, Nagaoka University of Technology
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Akahori Masatoshi
Department Of Mechanical Engineering Nagaoka University Of Technology
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Ratandecho Phadungsak
Department Of Mechanical Engineering Nagaoka University Of Technology
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Aoki Kazuo
Department Of Aeronautics And Astronautics Graduate School Of Engineering Kyoto University
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Aoki Kazuo
Department Of Aeronautical Engineering Kyoto University
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