Computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment

Quasi-collimated beam apparatus (QCBA), a typical bench scale UV apparatus, is crucial for the biodosimetry determination of UV dose in target reactors. However, the key parameters for the QCBA construction are usually estimated via rule-of-thumb calculations. Computational fluid dynamics models are...

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Bibliographic Details
Published in:Water science and technology 2021-05, Vol.83 (10), p.2526-2535
Main Authors: Lian, Junfeng, Sun, Liangmin, Jiang, Chong, Li, Wentao, Zhu, Yichun, Qin, Xinxin, Liu, Zuwen
Format: Article
Language:English
Subjects:
Apertures
Beams (radiation)
Computational fluid dynamics
Computer applications
Distance
Drinking water
Efficiency
Fluence
Fluid dynamics
Hydrodynamics
Lamps
Microorganisms
petri factor
quasi-collimated beam apparatus
Radiometers
Reactors
Simulation
Skewness
Ultraviolet radiation
uv fluence rate
Water treatment
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Summary:Quasi-collimated beam apparatus (QCBA), a typical bench scale UV apparatus, is crucial for the biodosimetry determination of UV dose in target reactors. However, the key parameters for the QCBA construction are usually estimated via rule-of-thumb calculations. Computational fluid dynamics models are applied in this study to simulate the UV fluence rate (FR) distributions in QCBAs. QCBAs with either a cylindrical tube or successive apertures irradiate quasi parallel light into selected dishes. The simulated Petri factors (PF) in the target QCBAs with a single aperture were all >0.84, and increased with the extended distance (L1) from the UV lamp to the upper aperture. QCBAs with two successive apertures are recommended compared with those with three apertures or cylindrical tube. A trend of FR distribution from dispersed to concentrated is observed when L1 or the interval distance between each aperture increases in a dual-aperture QCBA. QCBAs with multiple lamps were favorable to increase the UV output power, while having a nearly negligible loss of parallelism. An actual QCBA was constructed, and the maximal and average FR and PF values in a 60-mm dish were 0.159 and 0.164 W/m2, and 0.967, respectively, in accordance with the simulated results.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2021.144