IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : Strong turbulence and free surface interaction in a grid-stirred tank
Strong turbulence and free surface interaction in a grid-stirred tank
Author : L. Chiapponi1 and S. Longo1
In this work the analysis of the interaction between turbulence and free surface is detailed. The phenomenon takes place in many natural flows and industrial processes. In the present experiments turbulence is generated by a vertically oscillating grid moving beneath the free surface. Fluid velocity has been measured through a hot film anemometer and the free surface elevation is measured by an ultrasonic sensor based on flight-time. Integral length scales and several turbulence estimators have been computed. Aiming to detect the source effects of turbulence near the free surface, the correlation between free surface elevation and the underneath flow velocity has been studied, and the time lag between turbulence and free surface has been evaluated. A resonance regime was observed, with turbulence excited by free surface growing at a specific frequency of the grid.
File Size : 2,278,772 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
Download Now