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Bottom air diffusion in flow re-attachment downstream a chute aerator.

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Title: Bottom air diffusion in flow re-attachment downstream a chute aerator.
Authors: Wei, Wangru1 (AUTHOR) wangru_wei@hotmail.com, Deng, Jun1 (AUTHOR), Liu, Chao1 (AUTHOR), Ye, Fangzhou1 (AUTHOR), Xu, Weilin1 (AUTHOR)
Source: Journal of Hydraulic Research / Journal de Recherches Hydraulique. Jun2026, Vol. 64 Issue 3, p489-495. 7p.
Subjects: Aerated water flow, Bubble dynamics, Laboratory techniques, Flow separation
Abstract: Bottom air diffusion caused by separation and re-attachment processes is a typical flow feature downstream of chute aerators. A rapid air–water mixture process occurs during bubble count and size evolution as the entrained air diffuses cross-sectionally from the chute bottom. In this study laboratory experiments are conducted to investigate the air diffusion in the flow re-attachment region. According to the separation of the extremal maximum air concentration near the bottom of the chute, the air diffusion patterns can be divided into lower and upper parts. For the lower part close to the bottom, the coupling effects of the increase in the bubble count and size result in an increase in the air concentration, and the bubble count is more dominant than the slight increase in the bubble size. In the upper part, the air concentration decreases, accompanied by an increase in bubble size and a reduction in bubble count. The uniform pattern of the cross-sectional air diffusion is independent of the aerated flow re-attachment process. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Bottom air diffusion caused by separation and re-attachment processes is a typical flow feature downstream of chute aerators. A rapid air–water mixture process occurs during bubble count and size evolution as the entrained air diffuses cross-sectionally from the chute bottom. In this study laboratory experiments are conducted to investigate the air diffusion in the flow re-attachment region. According to the separation of the extremal maximum air concentration near the bottom of the chute, the air diffusion patterns can be divided into lower and upper parts. For the lower part close to the bottom, the coupling effects of the increase in the bubble count and size result in an increase in the air concentration, and the bubble count is more dominant than the slight increase in the bubble size. In the upper part, the air concentration decreases, accompanied by an increase in bubble size and a reduction in bubble count. The uniform pattern of the cross-sectional air diffusion is independent of the aerated flow re-attachment process. [ABSTRACT FROM AUTHOR]
ISSN:00221686
DOI:10.1080/00221686.2026.2638869