Flow Turbulence and Pressure Fluctuations in a Hydraulic Jump

Hyung Suk Kim, Seohye Choi, Moonhyeong Park and Yonguk Ryu ()
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Hyung Suk Kim: Department of Civil Engineering, Kunsan National University, Gunsan-si 54150, Republic of Korea
Seohye Choi: Department of Civil, Environmental and Sustainable Engineering, Arizona State University, 777 E. University Dr., Tempe, AZ 85287-8704, USA
Moonhyeong Park: Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, Goyang-si 10223, Republic of Korea
Yonguk Ryu: Department of Civil Engineering, Chonnam National University, Gwangju 61186, Republic of Korea

Sustainability, 2023, vol. 15, issue 19, 1-16

Abstract: Turbulence and pressure fluctuations are key elements in the bed protection design of hydraulic structures. However, their roles in a hydraulic jump are not yet fully understood, and the nature of their relationships are not conclusive. In order to better understand the relationships between pressure fluctuations and flow characteristics of a hydraulic jump downstream of a weir, detailed measurements of flow kinematics using the nonintrusive techniques of particle image velocimetry and bubble image velocimetry and pressure using voltage-type pressure gauges were carried out in this study. The physical modeling of the hydraulic jump was carried out using the simultaneous measurements of pressure and turbulent flow properties. The distributions of flow properties, such as water level and velocity, were assessed in each case. Based on the measurements, the correlations between the pressure fluctuations and the variables were investigated by coupling the statistical values of the variables at the same points. The analysis results show that the water level and turbulence intensity are the main factors influencing the pressure fluctuations in the hydraulic jump. Using these factors, an empirical formula and dimensionless numbers are proposed to show that the pressure fluctuations depend on the bubble flow behavior.

Keywords: hydraulic jump; turbulence; particle images velocimetry; bubble image velocimetry; air-water flow (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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