流動層内の粒子循環状況の可視化と循環粒子の熱輸送に基づく伝熱促進効果の評価

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This paper deals with the visualization of particle recirculation behavior and with the estimation of heat transfer enhancement due to particle convection in a fluidized bed. In order to examine the trajectory of a fluidized particle in a bed, fluorescent particles put into the fluidized bed were illuminated by a UV light, and their motion was recorded on a VCR. The Visualized results enabled us to evaluate the contact period and contact frequency between the fluidized particles and a heat transfer surface immersed in the bed, as well as the particle velocity in each region of the bed. Using the visualized recirculation behavior of a fluidized particle, heat transfer enhancement due to "particle-convection" was estimated, and the contribution of the effect to the total heat transfer was discussed.
1997-06-25