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dc.contributor.authorWei, W.
dc.contributor.authorXu, W.
dc.contributor.authorDeng, J.
dc.contributor.authorGuo, Yakun
dc.date.accessioned2020-01-30T12:07:11Z
dc.date.available2020-01-30T12:07:11Z
dc.date.issued2020-07
dc.identifier.citationWei W, Xu W, Deng J et al (2020) Free surface air entrainment and single-bubble movement in supercritical open-channel flow. Journal of Hydraulic Engineering. 146(7): 04020050.en_US
dc.identifier.urihttp://hdl.handle.net/10454/17610
dc.descriptionYesen_US
dc.description.abstractThere has been little study on the microscopic bubble entrainment and diffusion process on the high-speed self-aerated flows although the problem under investigation is theoretically important and has important engineering application. This study presents an experimental investigation on visual processes of free surface air entrainment and single bubble diffusion in supercritical open channel flows. The typical surface deformation, single air bubble rising and penetration are recorded using a high-speed camera system. Results show that for a single bubble formation process, surface entrapment development and bubble entrainment through a deformation evolution underneath the free surface are the two main features. The shape variation of local surface deformation with time follows an identical power law for different bubble size generations. The entrained bubble size depends on both size scale and shape of entrapped free surface. As the single bubble moves downstream, its longitudinal velocity is approximately the same as that of water flow surrounded it, while its vertical velocity for rising and penetration increases with the increase of the water flow velocity. An empirical-linear relationship for the bubble rising and penetration velocity with water flow velocity is obtained. This study demonstrates that the microscopic bubble movement can improve the self-aeration prediction in the open channel flow and advance the knowledge of our understanding of the macroscopic and microscopic air–water properties in hydraulic engineering.en_US
dc.description.sponsorshipNational Natural Science Foundation of China (Grant number 51609162), Sichuan Science and Technology Program (Grant number 2019JDTD0007) and the Open funding of the State Key Laboratory of Hydraulics and Mountain River Engineering of Sichuan University (Project No: Skhl1809).en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://doi.org/10.1061/(ASCE)HY.1943-7900.0001769
dc.rightsThis material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://doi.org/10.1061/(ASCE)HY.1943-7900.0001769.
dc.subjectFree surfaceen_US
dc.subjectAir entrainmenten_US
dc.subjectAir bubbleen_US
dc.subjectOpen channel flowen_US
dc.titleFree surface air entrainment and single-bubble movement in supercritical open-channel flowen_US
dc.status.refereedYesen_US
dc.date.Accepted2020-01-13
dc.date.application2020-05-06
dc.typeArticleen_US
dc.type.versionAccepted manuscripten_US
refterms.dateFOA2020-01-30T12:07:40Z


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