Numerical study on effects of chamber design and multi-inlet on storm geyser

Storm geysers increasingly occur in sewer systems under climate change and rapid urbanization. Mitigation measures are in great demand to avoid safety problems. In this study, three-dimensional computational fluid dynamics models of single-inlet and multi-inlet systems were established to investigat...

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Autores principales:	Jiachun Liu, Shuangqing Zhang, Biao Huang, David Z. Zhu
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	chamber design cfd deflector entrapped air pocket multi-inlet system storm geyser Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/f364a3abae674518900f335732a40be4
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id	oai:doaj.org-article:f364a3abae674518900f335732a40be4
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spelling	oai:doaj.org-article:f364a3abae674518900f335732a40be42021-11-06T10:52:19ZNumerical study on effects of chamber design and multi-inlet on storm geyser0273-12231996-973210.2166/wst.2021.061https://doaj.org/article/f364a3abae674518900f335732a40be42021-03-01T00:00:00Zhttp://wst.iwaponline.com/content/83/6/1286https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Storm geysers increasingly occur in sewer systems under climate change and rapid urbanization. Mitigation measures are in great demand to avoid safety problems. In this study, three-dimensional computational fluid dynamics models of single-inlet and multi-inlet systems were established to investigate geysering induced by rapid filling and assess the effectiveness of potential mitigation methods. The modeling results suggest that increasing the capacity of the downstream pipe before the inflow front reaches the chamber can effectively reduce the maximum geyser pressure. The peak pressure can be significantly mitigated when the chamber size is designed with care and the drop height between the upstream and downstream pipes is reduced. A diversion deflector with air vents and an orifice plate at the riser top end can alleviate the maximum pressure by about 65% with about 75% of the entrapped air being released. The peak pressure during the geyser event in the multi-inlet model is less than that of a single-inlet model under the same total inflow condition, but more water can be released. HIGHLIGHTS A small drop height between the connecting pipes can effectively reduce the maximum pressure during rapid filling.; Mitigation measures including flow deflectors and orifice plates were studied to alleviate geyser intensity.; Intermittent air–water jets can be generated much more easily in a system with multiple inlets, and the peak pressure is generally small but more water can be released.;Jiachun LiuShuangqing ZhangBiao HuangDavid Z. ZhuIWA Publishingarticlechamber designcfddeflectorentrapped air pocketmulti-inlet systemstorm geyserEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 6, Pp 1286-1299 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	chamber design cfd deflector entrapped air pocket multi-inlet system storm geyser Environmental technology. Sanitary engineering TD1-1066
spellingShingle	chamber design cfd deflector entrapped air pocket multi-inlet system storm geyser Environmental technology. Sanitary engineering TD1-1066 Jiachun Liu Shuangqing Zhang Biao Huang David Z. Zhu Numerical study on effects of chamber design and multi-inlet on storm geyser
description	Storm geysers increasingly occur in sewer systems under climate change and rapid urbanization. Mitigation measures are in great demand to avoid safety problems. In this study, three-dimensional computational fluid dynamics models of single-inlet and multi-inlet systems were established to investigate geysering induced by rapid filling and assess the effectiveness of potential mitigation methods. The modeling results suggest that increasing the capacity of the downstream pipe before the inflow front reaches the chamber can effectively reduce the maximum geyser pressure. The peak pressure can be significantly mitigated when the chamber size is designed with care and the drop height between the upstream and downstream pipes is reduced. A diversion deflector with air vents and an orifice plate at the riser top end can alleviate the maximum pressure by about 65% with about 75% of the entrapped air being released. The peak pressure during the geyser event in the multi-inlet model is less than that of a single-inlet model under the same total inflow condition, but more water can be released. HIGHLIGHTS A small drop height between the connecting pipes can effectively reduce the maximum pressure during rapid filling.; Mitigation measures including flow deflectors and orifice plates were studied to alleviate geyser intensity.; Intermittent air–water jets can be generated much more easily in a system with multiple inlets, and the peak pressure is generally small but more water can be released.;
format	article
author	Jiachun Liu Shuangqing Zhang Biao Huang David Z. Zhu
author_facet	Jiachun Liu Shuangqing Zhang Biao Huang David Z. Zhu
author_sort	Jiachun Liu
title	Numerical study on effects of chamber design and multi-inlet on storm geyser
title_short	Numerical study on effects of chamber design and multi-inlet on storm geyser
title_full	Numerical study on effects of chamber design and multi-inlet on storm geyser
title_fullStr	Numerical study on effects of chamber design and multi-inlet on storm geyser
title_full_unstemmed	Numerical study on effects of chamber design and multi-inlet on storm geyser
title_sort	numerical study on effects of chamber design and multi-inlet on storm geyser
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/f364a3abae674518900f335732a40be4
work_keys_str_mv	AT jiachunliu numericalstudyoneffectsofchamberdesignandmultiinletonstormgeyser AT shuangqingzhang numericalstudyoneffectsofchamberdesignandmultiinletonstormgeyser AT biaohuang numericalstudyoneffectsofchamberdesignandmultiinletonstormgeyser AT davidzzhu numericalstudyoneffectsofchamberdesignandmultiinletonstormgeyser
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Numerical study on effects of chamber design and multi-inlet on storm geyser

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