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Water 2018, 10(9), 1201; https://doi.org/10.3390/w10091201

Experiments on Turbulence Intensity and Bubble Frequency in Self-Aerated Open Channel Flows

State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
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Received: 9 August 2018 / Revised: 30 August 2018 / Accepted: 4 September 2018 / Published: 6 September 2018
(This article belongs to the Section Hydraulics)
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Abstract

Although spillways have been investigated experimentally by various researchers, only a few studies have been conducted on the comprehensive properties of a self-aerated air-water flow. In this study, new experimental data were recorded and discussed for the distribution of the air concentration, air-water velocity, turbulence intensity and bubble frequency in the completely developed regions for spillways. It was observed that both the turbulence intensity and bubble frequency increased from the bottom and subsequently decreased near the free surface. The positions of maximum air bubble frequency and turbulence intensity gradually approached air concentration to 0.50 in the self-aerated developed region. Self-similar relationships between the turbulence intensity and bubble frequency were proposed. View Full-Text
Keywords: self-aerated flow; air concentration; turbulence intensity; air bubble frequency; experiment data self-aerated flow; air concentration; turbulence intensity; air bubble frequency; experiment data
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bai, R.; Zhang, F.; Liu, S.; Wang, W. Experiments on Turbulence Intensity and Bubble Frequency in Self-Aerated Open Channel Flows. Water 2018, 10, 1201.

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