Abstract
By CFD-DEM simulations, the present work is aimed to investigate the transient gas-solid bubbling mechanisms along a whole bubble lifecycle in a 2D fluidized bed from a micro perspective. Systemic comparisons with CCD measurements confirm the validity of current simulations. Afterward, the manner of particle motion and its driving mechanisms at various stages are investigated. In order to do that, external forces are analyzed at an individual particle level, including the drag, pressure gradient force, and their resultant acceleration together with gravity. Many interesting findings have been achieved. For example, a switch in directions of drag and pressure gradient forces at the root of an initial bubble enables its detachment. And, regarding their contributions to the burst of a bubble, the drag force is several times of the pressure gradient forces. Present efforts help to offer a novel view of particle dynamics during the bubbling fluidization.
Funding source: Natural Science Foundation of Shanghai 10.13039/100007219
Award Identifier / Grant number: 19ZR1401800
Funding source: National Natural Science Foundation of China 10.13039/501100001809
Award Identifier / Grant number: 52076138
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: The work was financially supported by Natural Science Foundation of Shanghai (No. 19ZR1401800) and National Natural Science Foundation of China (No. 52076138).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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