NUMERICAL SIMULATION OF PARTICLE AGGREGATION IN GRID FLOCCULATION TANK BASED ON CFD-PBM

CHAI Tongshan; FU Yu; CHENG Huaiyu; LONG Xinping

doi:10.13205/j.hjgc.202304006

Volume 41 Issue 4

Apr. 2023

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CHAI Tongshan, FU Yu, CHENG Huaiyu, LONG Xinping. NUMERICAL SIMULATION OF PARTICLE AGGREGATION IN GRID FLOCCULATION TANK BASED ON CFD-PBM[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(4): 40-48. doi: 10.13205/j.hjgc.202304006

Citation:

CHAI Tongshan, FU Yu, CHENG Huaiyu, LONG Xinping. NUMERICAL SIMULATION OF PARTICLE AGGREGATION IN GRID FLOCCULATION TANK BASED ON CFD-PBM[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(4): 40-48. doi: 10.13205/j.hjgc.202304006

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NUMERICAL SIMULATION OF PARTICLE AGGREGATION IN GRID FLOCCULATION TANK BASED ON CFD-PBM

doi: 10.13205/j.hjgc.202304006

CHAI Tongshan^1,2,
FU Yu^1,2,
CHENG Huaiyu^1,2,
LONG Xinping^{1,2
,
,}

1. Key Laboratory of Hubei Province for Waterjet Theory and New Technology, Wuhan 430072, China;
2. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China

Received Date: 2022-03-24
Available Online: 2023-05-26
Publish Date: 2023-04-01

Abstract

Abstract

In order to explore the influencing factors of particle aggregation behavior in the flocculation tank, the population balance model (PBM) was used to simulate the particle aggregation behavior in this paper. By means of CFD-PBM coupling method, the effects of initial average particle size and volume fraction of flocculated particles on particle aggregation behavior in a grid flocculation tank were studied. An index of average particle size growth rate was proposed to characterize the flocculation effect inside the flocculation tank under the CFD-PBM coupling method. The results showed that: 1) when the inlet particle volume fraction was 0.1, as the initial average particle size of flocculated particles increased from 10 μm to 76 μm, the particle size at the outlet increased from 117.54 μm to 154.82 μm, but the average particle size growth rate decreased from 1075.4% to 103.7%; 2) when the initial particle size of the inlet particles was 40 μm, as the particle volume fraction increased from 0.05 to 0.2, the particle size at the outlet position increased from 127.16 μm to 155.74 μm, and the average particle size growth rate also increased from 208.7% to 289.4%; 3) overall, within the particle volume fraction range of 0.05 to 0.1, the average particle size growth rate was the highest, and the flocculation effect improved most significantly.
- hydraulic flocculation,
- particle aggregation,
- population balance model,
- numerical simulation

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References(25)

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