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- W3178193934 abstract "Annular catalyst cooler (ACC) can intensify the bed-to-wall heat transfer compared with traditional base catalyst cooler (BCC). Although the intensified mechanism has been investigated, it is necessary to clearly understand information on hydrodynamics and internal circulation characteristics in the whole cooler. Euler-Euler model with modified Gidaspow drag model is employed to simulate the hydrodynamics and internal circulation characteristics. The results show that the hydrodynamics difference between two coolers is positioned at their downer region, where the solids volume fraction in the ACC is bigger than those in the upper region of dense bed and in the whole BCC. The internal circulation of particles in the ACC is also located in the downer region of dense bed, which is verified by profiles of axial and radial velocities at different positions. In order to quantify this internal circulation flow, both internal circulation height and flux are proposed and determined respectively by radial velocity of particles and by their flux below heat tube. The height increases and the flux decreases with increasing gas velocity from center distributor. Those results indicate that the heat transfer intensified effect is mainly influenced by internal circulation height, which is agreement with the effect of gas velocity on heat transfer intensified height." @default.
- W3178193934 created "2021-07-19" @default.
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- W3178193934 date "2021-08-01" @default.
- W3178193934 modified "2023-10-16" @default.
- W3178193934 title "Effect of hydrodynamics on solids internal circulation characteristics in an annular catalyst cooler" @default.
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- W3178193934 doi "https://doi.org/10.1016/j.apt.2021.05.042" @default.
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