| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
The motion of large solid objects in dense gas-solid flows such as fluidized bed is highly complex due to the influence of surrounding medium particles and gas. In this study, by using numerical simulation based on an original discrete coarse particle model together with nuclear magnetic resonance imaging (MRI) that enables the real-time measurement of granular motions, detailed observation and elucidation of the underlying physics behind the object motions were conducted. Specifically, we focused on the anomalous sphere sinking phenomenon in a particle bed aerated under but close to the minimum fluidization velocity. When the sphere density is close to the apparent density of the bed, local fluidization with bubble formations was observed around the sinking sphere. We revealed that small attenuation of upward fluid force occurring at the moment of bubble detachments from the sphere surface is responsible for the slower and deeper sinking of the sphere.
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