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Daniel G. Allasia, Liriane Élen Böck, Jose G. Vasconcelos, Leandro C. Pinto, Rutineia Tassi, Bruna Minetto, Cristiano G. Persch and Robson L. Pachaly
Transient flows in stormwater systems can lead to damaging and dangerous operational conditions, as exemplified by geysering events created by the uncontrolled release of entrapped air pockets. Extreme rain and associated rapid inflows may result in air ...
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Elias Tasca, Mohsen Besharat, Helena M. Ramos, Edevar Luvizotto, Jr. and Bryan Karney
Air valves are protective devices often used in pressurised water pipelines, ideally admitting air to limit sub-atmospheric pressures and controlling the release of entrapped air. This work summarises a comprehensive sensitivity analysis of the transient...
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Wanli Yang, Yang Dou, Junwu Qin, Yuankang Yang, Yuzhi Zhang and Weiyong Zhang
Entrapped air in the chambers of a T-girder bridge generates a considerably large vertical force which is harmful to the safety of the bridge superstructure. The contribution of the entrapped air is not considered when calculating flood force in the rela...
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Hongyue Sun, Weiye Ding, Xizeng Zhao and Zhaochen Sun
Due to the entrapment of compressible air, the process of a flat plate impact on water is complicated, which cannot be reproduced using incompressible simulations. To investigate such a slamming process, an accuracy compressible fluid?structure interacti...
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Jaehyun Lee, Ehsan Esmaili, Giho Kang, Baekhoon Seong, Hosung Kang, Jihoon Kim, Sunghwan Jung, Hyunggun Kim and Doyoung Byun
The dimple occurs by sudden pressure inversion at the droplet?s bottom interface when a droplet collides with the same liquid-phase or different solid-phase. The air film entrapped inside the dimple is a critical factor affecting the sequential dynamics ...
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Yasutaka Tanaka, Taro Uchida, Hitoshi Nagai and Hikaru Todate
Soil pipes are commonly found in landslide scarps, and it has been suggested that build-up of pore water pressure due to clogged soil pipes influences landslide initiation. Several researchers have also suggested that entrapped air in the soil layer incr...
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Salvador García-Todolí, Pedro L. Iglesias-Rey, Daniel Mora-Meliá, F. Javier Martínez-Solano and Vicente S. Fuertes-Miquel
The analysis of transient flow is necessary to design adequate protection systems that support the oscillations of pressure produced in the operation of motor elements and regulation. Air valves are generally used in pressurized water pipes to manage the...
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Daniel B. Bung and Daniel Valero
As with most high-velocity free-surface flows, stepped spillway flows become self-aerated when the drop height exceeds a critical value. Due to the step-induced macro-roughness, the flow field becomes more turbulent than on a similar smooth-invert chute....
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Lin Li, David Z. Zhu and Biao Huang
Rapid filling/emptying of pipes is commonly encountered in water supply and sewer systems, during which pressure transients may cause unexpected large pressure and/or geyser events. In the present study, a linearized analytical model is first developed t...
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Ciro Apollonio, Gabriella Balacco, Nicola Fontana, Maurizio Giugni, Gustavo Marini, Alberto Ferruccio Piccinni
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One of the main issues arising during the rapid filling of a pipeline is the pressure transient which originates after the entrapped air has been expelled at the air release valve. Because of the difference in density between water and air, a pressure tr...
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