In open channel flows, a hydraulic jump is a rapid shift from a supercritical flow to a subcritical flow with a sharp rise in the elevation of the free surface, which is associated with strong energy dissipation, air entrainment, and spray. The present research aims to investigate the air–water flow properties in a hydraulic jump on rough pebbled bed. A range of discharges from 0.06 to 0.1 m3/s, corresponding to inflow Froude numbers Fr1 between 1.7 and 2.84 and Reynolds numbers Re1 from 140,000 to 220,000 were considered. The basic parameters of two-phase flow such as the void fraction and bubble count rate are presented. Close to the jump toe, the mean void fraction on rough bed was larger than on smooth bed, while farther downstream larger magnitudes were observed on smooth bed. No significant difference was observed between rough and smooth beds in terms of the maximum void fraction. In the turbulent shear layer, the bubble count rate was comparatively larger on rough bed than on smooth bed, while the longitudinal distribution decayed for both bed configurations.

Air–water flow properties in hydraulic jumps on rough pebbled bed / Bahmanpouri, Farhad; Gualtieri, Carlo; Chanson, Hubert. - In: ISH JOURNAL OF HYDRAULIC ENGINEERING. - ISSN 0971-5010. - 29:3(2023), pp. 308-317. [10.1080/09715010.2022.2068354]

Air–water flow properties in hydraulic jumps on rough pebbled bed

Bahmanpouri, Farhad
Writing – Original Draft Preparation
;
Gualtieri, Carlo
Conceptualization
;
2023

Abstract

In open channel flows, a hydraulic jump is a rapid shift from a supercritical flow to a subcritical flow with a sharp rise in the elevation of the free surface, which is associated with strong energy dissipation, air entrainment, and spray. The present research aims to investigate the air–water flow properties in a hydraulic jump on rough pebbled bed. A range of discharges from 0.06 to 0.1 m3/s, corresponding to inflow Froude numbers Fr1 between 1.7 and 2.84 and Reynolds numbers Re1 from 140,000 to 220,000 were considered. The basic parameters of two-phase flow such as the void fraction and bubble count rate are presented. Close to the jump toe, the mean void fraction on rough bed was larger than on smooth bed, while farther downstream larger magnitudes were observed on smooth bed. No significant difference was observed between rough and smooth beds in terms of the maximum void fraction. In the turbulent shear layer, the bubble count rate was comparatively larger on rough bed than on smooth bed, while the longitudinal distribution decayed for both bed configurations.
2023
Air–water flow properties in hydraulic jumps on rough pebbled bed / Bahmanpouri, Farhad; Gualtieri, Carlo; Chanson, Hubert. - In: ISH JOURNAL OF HYDRAULIC ENGINEERING. - ISSN 0971-5010. - 29:3(2023), pp. 308-317. [10.1080/09715010.2022.2068354]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/886027
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