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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Autores principales:	Junfeng Lian, Liangmin Sun, Chong Jiang, Wentao Li, Yichun Zhu, Xinxin Qin, Zuwen Liu
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	computational fluid dynamics petri factor quasi-collimated beam apparatus uv fluence rate Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/83f7022f28d741c6823197fb04ae5d30
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spelling	oai:doaj.org-article:83f7022f28d741c6823197fb04ae5d302021-11-06T11:05:42ZComputational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment0273-12231996-973210.2166/wst.2021.144https://doaj.org/article/83f7022f28d741c6823197fb04ae5d302021-05-01T00:00:00Zhttp://wst.iwaponline.com/content/83/10/2526https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Quasi-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. HIGHLIGHTS The designed collimator diameter should be larger than the reactor diameter.; FR distributions transformed from dispersed to concentrated when the distance between the lamp and the collimator increased.; QCBAs with two successive apertures were enough to produce satisfactory parallel beams.; QCBAs with multiple lamps were favorable to increase the UV output power with a nearly negligible loss of parallelism.;Junfeng LianLiangmin SunChong JiangWentao LiYichun ZhuXinxin QinZuwen LiuIWA Publishingarticlecomputational fluid dynamicspetri factorquasi-collimated beam apparatusuv fluence rateEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 10, Pp 2526-2535 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	computational fluid dynamics petri factor quasi-collimated beam apparatus uv fluence rate Environmental technology. Sanitary engineering TD1-1066
spellingShingle	computational fluid dynamics petri factor quasi-collimated beam apparatus uv fluence rate Environmental technology. Sanitary engineering TD1-1066 Junfeng Lian Liangmin Sun Chong Jiang Wentao Li Yichun Zhu Xinxin Qin Zuwen Liu Computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment
description	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. HIGHLIGHTS The designed collimator diameter should be larger than the reactor diameter.; FR distributions transformed from dispersed to concentrated when the distance between the lamp and the collimator increased.; QCBAs with two successive apertures were enough to produce satisfactory parallel beams.; QCBAs with multiple lamps were favorable to increase the UV output power with a nearly negligible loss of parallelism.;
format	article
author	Junfeng Lian Liangmin Sun Chong Jiang Wentao Li Yichun Zhu Xinxin Qin Zuwen Liu
author_facet	Junfeng Lian Liangmin Sun Chong Jiang Wentao Li Yichun Zhu Xinxin Qin Zuwen Liu
author_sort	Junfeng Lian
title	Computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment
title_short	Computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment
title_full	Computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment
title_fullStr	Computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment
title_full_unstemmed	Computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment
title_sort	computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale uv apparatus for water treatment
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/83f7022f28d741c6823197fb04ae5d30
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Computational fluid dynamics modelling of quasi-collimated beam apparatus – a typical bench scale UV apparatus for water treatment

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