Air–water interactions during rapid filling of a closed horizontal pipe DOI
Yaohui Chen, Pengcheng Li, Zhaodan Fei

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(4)

Published: April 1, 2025

Rapid filling processes in urban water infrastructure, involving open-channel to pressurized flow transitions with complex air–water interactions, require precise understanding of transient pressure surges, air entrapment and discharge mechanisms. This study establishes the first experimental framework classifying rapid pipe into four distinct stages: advancing bore (stage I), reflection II), intrusion III), residual release subsequent inertial oscillations IV). Quantified parameters including speeds, rate evolutions during each stage, are systematically correlated gate opening inlet head, establishing novel predictive relationships. The arrival pipe-filling bores at shaft can induce significant peak magnitudes reaching 2.3 times head through newly identified scaling law dependent on operational parameters. advancing, all cause shaft, an expression for maximum is obtained. Critically, over 90% initial expelled stages I–III, 28%–77% stage I, which accounts less than 11% total duration. volume I increases as increase. These findings provide a critical foundation development validated models, mitigation surge risks, optimization resilient infrastructure.

Language: Английский

Air–water interactions during rapid filling of a closed horizontal pipe DOI
Yaohui Chen, Pengcheng Li, Zhaodan Fei

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(4)

Published: April 1, 2025

Rapid filling processes in urban water infrastructure, involving open-channel to pressurized flow transitions with complex air–water interactions, require precise understanding of transient pressure surges, air entrapment and discharge mechanisms. This study establishes the first experimental framework classifying rapid pipe into four distinct stages: advancing bore (stage I), reflection II), intrusion III), residual release subsequent inertial oscillations IV). Quantified parameters including speeds, rate evolutions during each stage, are systematically correlated gate opening inlet head, establishing novel predictive relationships. The arrival pipe-filling bores at shaft can induce significant peak magnitudes reaching 2.3 times head through newly identified scaling law dependent on operational parameters. advancing, all cause shaft, an expression for maximum is obtained. Critically, over 90% initial expelled stages I–III, 28%–77% stage I, which accounts less than 11% total duration. volume I increases as increase. These findings provide a critical foundation development validated models, mitigation surge risks, optimization resilient infrastructure.

Language: Английский

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