Next Article in Journal
Artificial Neural Networks for Predicting the Water Retention Curve of Sicilian Agricultural Soils
Next Article in Special Issue
Experimental Optimization of Gate-Opening Modes to Minimize Near-Field Vibrations in Hydropower Stations
Previous Article in Journal
Risk-Based Decision-Making for Evacuation in Case of Imminent Threat of Flooding
Previous Article in Special Issue
Application of Python Scripting Techniques for Control and Automation of HEC-RAS Simulations
Article Menu

Export Article

Open AccessArticle
Water 2018, 10(10), 1430; https://doi.org/10.3390/w10101430

Three-Dimensional Aerators: Characteristics of the Air Bubbles

1
Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China
2
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Conservancy, Chengdu 610041, China
3
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
*
Author to whom correspondence should be addressed.
Received: 26 August 2018 / Revised: 29 September 2018 / Accepted: 29 September 2018 / Published: 12 October 2018
(This article belongs to the Special Issue Advances in Hydraulics and Hydroinformatics)
Full-Text   |   PDF [10581 KB, uploaded 12 October 2018]   |  

Abstract

Three-dimensional aerators are often used in hydraulic structures to prevent cavitation damage via enhanced air entrainment. However, the mechanisms of aeration and bubble dispersion along the developing shear flow region on such aerators remain unclear. A double-tip conductivity probe is employed in present experimental study to investigate the air concentration, bubble count rate, and bubble size downstream of a three-dimensional aerator involving various approach-flow features and geometric parameters. The results show that the cross-sectional distribution of the air bubble frequency is in accordance with the Gaussian distribution, and the relationship between the air concentration and bubble frequency obeys a quasi-parabolic law. The air bubble frequency reaches an apex at an air concentration (C) of approximately 50% and decreases to zero as C = 0% and C = 100%. The relative location of the air-bubble frequency apex is 0.210, 0.326 and 0.283 times the thickness of the layers at the upper, lower and side nappes, respectively. The air bubble chord length decreases gradually from the air water interface to the core area. The air concentration increases exponentially with the bubble chord length. The air bubble frequency distributions can be fit well using a “modified” gamma distribution function. View Full-Text
Keywords: three-dimensional aerator; air concentration; air bubble frequency; air bubble chord length three-dimensional aerator; air concentration; air bubble frequency; air bubble chord length
Figures

Figure 1

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).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Li, S.; Zhang, J.; Chen, X.; Chen, J. Three-Dimensional Aerators: Characteristics of the Air Bubbles. Water 2018, 10, 1430.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top