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Investigation of Bubble Behavior in Gas‐Solid Fluidized Beds with Different Gas Distributors
Author(s) -
Jang Kwangbyol,
Feng Yali,
Li Haoran
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000156
Subject(s) - distributor , bubble , body orifice , mechanics , fluidized bed , coalescence (physics) , materials science , two dimensional gas , chemistry , thermodynamics , chromatography , physics , engineering , mechanical engineering , gas chromatography , astrobiology
The behavior of gas bubbles in a gas‐solid fluidized bed was investigated by computational fluid dynamics simulation. A two‐phase flow model incorporating the kinetic theory of granular flow was used to study the effect of gas distributor design on the size distribution and the rise velocity of gas bubbles in the bed column. The experiments were conducted on four gas distributors with different orifice sizes and pitches. The geometry of the gas distributor had a significant influence on the bubble behavior in the gas‐solid fluidized bed. The effects of static bed height and superficial gas velocity were also considered. Bubble diameter and bubble rise velocity increased with gas velocity. However, at low bed height, the deviation in bubble size was indistinct because at higher gas velocity the rising tendency of the bubble formed just above the gas distributor increased and the probability of bubble coalescence decreased.