Non-invasive measurement of floating–sinking motion of a large object in a gas–solid fluidized bed
Autor: | Jun Oshitani, Takuya Tsuji, Kei Matsuoka, Tomoki Ikegai, Koshi Uemoto, Wataru Yoshimori, Shusaku Harada, Shohei Narita, Hirokazu Kajiwara |
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Rok vydání: | 2019 |
Předmět: |
Physics
Magnetometer 0211 other engineering and technologies General Physics and Astronomy Probability density function 02 engineering and technology Mechanics 01 natural sciences law.invention Acceleration Mechanics of Materials law Fluidized bed 0103 physical sciences Vertical direction Force dynamics General Materials Science Fluidization Hydrostatic equilibrium 010306 general physics 021101 geological & geomatics engineering |
Zdroj: | Granular Matter. 21 |
ISSN: | 1434-7636 1434-5021 |
Popis: | A Lagrangian sensor system has been established to non-invasively measure both the vertical position and dynamic force acting on itself. It consists of a 3-axis acceleration sensor, a 3-axis magnetometer, a microcontroller, a wireless module, batteries, and external electromagnetic coils. In this study, we applied the system to a free-moving coarse object in a gas–solid fluidized bed. The floating and sinking motions of the object in the fluidized bed are essentially caused by differences between its density and the apparent density of the fluidized media. However, the object sometimes shows strange behavior under the influence of variance in the fluidization state. We measured the temporal change of the upward force acting on the object as well as the vertical position, which is invisible from the outside. The experimental results indicate that the force acting on the object differs significantly between the floating and sinking states and is greatly complicated by interference with rising bubbles in the fluidized bed. The probability density of the vertical position of the object shows that its motion is explained not only by hydrostatic effects, but also by inhomogeneity of the fluidization state in the bed. |
Databáze: | OpenAIRE |
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