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- Title
CFD-PBM simulation of power law fluid in a bubble column reactor.
- Authors
Duan, Meng-Qiang; Li, Shao-Bai; Bhusal, Manju L.; Zhang, Wei; Ding, Yu-Huan
- Abstract
A computational fluid dynamics coupled population balance model (CFD-PBM) was used to numerically simulate the fluid dynamics of bubble swarms in a bubble column containing non-Newtonian fluids. The effects of superficial gas velocity (Ug), the consistency index (K), and the flow index (n) on bubble size distribution (BSD), gas holdup, and fluid dynamic viscosity in a bubble column were analyzed at both local and overall scales. As Ug increases, the bubble breakup occurs excessively, the gas holdup increases, and the dynamic viscosity decreases. K and n were used to characterize the rheological properties of power law fluid. As K increases, fluid viscosity increases, bubble breakup rate decreases, gas holdup in the top zone is slightly lower than in the middle zone, and dynamic viscosity increases. Within the range of n from 0.45 to 1.07, when n is smallest, the relative frequency of bubbles smaller than the initial size is relatively large, and the overall and local gas holdup are the highest. When n = 1.07, the fluid exhibits shear-thickening properties, and the dynamic viscosity variations are significant.
- Subjects
BUBBLE column reactors; COMPUTATIONAL fluid dynamics; BUBBLES; FLUID dynamics; RHEOLOGY; NON-Newtonian fluids; DYNAMIC viscosity
- Publication
International Journal of Chemical Reactor Engineering, 2024, Vol 22, Issue 6, p701
- ISSN
1542-6580
- Publication type
Article
- DOI
10.1515/ijcre-2024-0010