TY - GEN
T1 - Three-dimensional air-water flow properties of a hydraulic jump with low Froude numbers and relatively high Reynolds numbers
AU - Wüthrich, D.
AU - Shi, R.
AU - Wang, H.
AU - Chanson, H.
PY - 2020
Y1 - 2020
N2 - Hydraulic jumps are commonly employed as energy dissipators to guarantee long-term operation of hydraulic structures. Thus, a comprehensive and in-depth understanding of its main features is fundamental. In this context, the current study focused on a hydraulic jump with a low Froude number (Fr1 = 2.4) and a relatively high Reynolds number (Re = 1.83×105). Experimental tests employed dual-tip phase-detection probes to provide a comprehensive characterisation of the main air-water flow properties of the hydraulic jump in terms of void fraction, bubble count rate and interfacial velocities. Importantly, this research focused on the air-water flow property distribution across the channel width, revealing lower values of void fraction and bubble count rate next to the sidewall as compared to the channel centreline. Such a spatial variability in the transverse direction questions whether data near the walls may be representative of the flow behaviour in the centreline, raising the issue of sidewall effects in image-based techniques. These findings provide helpful information to both researchers and practitioners for a better understanding of the physical process, leading to an optimised design of hydraulic structures.
AB - Hydraulic jumps are commonly employed as energy dissipators to guarantee long-term operation of hydraulic structures. Thus, a comprehensive and in-depth understanding of its main features is fundamental. In this context, the current study focused on a hydraulic jump with a low Froude number (Fr1 = 2.4) and a relatively high Reynolds number (Re = 1.83×105). Experimental tests employed dual-tip phase-detection probes to provide a comprehensive characterisation of the main air-water flow properties of the hydraulic jump in terms of void fraction, bubble count rate and interfacial velocities. Importantly, this research focused on the air-water flow property distribution across the channel width, revealing lower values of void fraction and bubble count rate next to the sidewall as compared to the channel centreline. Such a spatial variability in the transverse direction questions whether data near the walls may be representative of the flow behaviour in the centreline, raising the issue of sidewall effects in image-based techniques. These findings provide helpful information to both researchers and practitioners for a better understanding of the physical process, leading to an optimised design of hydraulic structures.
KW - Air-water flow properties
KW - Energy dissipation
KW - Hydraulic jump
KW - Hydraulic structures
KW - Physical modelling
KW - Sidewall effects
UR - http://www.scopus.com/inward/record.url?scp=85090912826&partnerID=8YFLogxK
U2 - 10.14264/uql.2020.583
DO - 10.14264/uql.2020.583
M3 - Conference contribution
AN - SCOPUS:85090912826
T3 - Proceedings of the 8th IAHR International Symposium on Hydraulic Structures, ISHS 2020
BT - Proceedings of the 8th IAHR International Symposium on Hydraulic Structures, ISHS 2020
PB - University of Queensland
T2 - 8th IAHR International Symposium on Hydraulic Structures, ISHS 2020
Y2 - 12 May 2020 through 15 May 2020
ER -