Characterization of bubble cloud quality and evolution using optical probes

29th IAHR Symposium on Hydraulic Machinery and Systems

Bouvard, J.^1 ; Béguin, C.^1 ; Etienne, S.^1 ; Scott, D.^2 ; Bornard, L.^2

Polytechnique Montréal, Mechanical Engineering Dpt, Canada^1

Hydrodynamics Engineering, Hydro Solutions, GE Renewable Energy, Canada^2

关键词: Complex geometries;    Complicated geometry;    Dissolved oxygen levels;    Industrial processs;    Measurements of;    Optical probe;    Simple geometries;    Validation of numerical model;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/6/062051/pdf
DOI  :  10.1088/1755-1315/240/6/062051

来源: IOP

【 摘 要 】

The mechanics of bubble clouds are essential to many industrial processes in the energy and chemical realms. In the specific case of hydroelectric turbines, bubble clouds are present when air is injected into the water to increase dissolved oxygen levels in the water flowing through the powerplant. Understanding the physics of the phenomena driving the mixing of bubbles is still needed to improve the modeling of such flows. Even in less complicated geometries such as those found in many laboratory flows, measurements of bubble cloud evolution are sparse and validation of numerical models is difficult. Descriptions of the evolution of bubble clouds in simple geometries are therefore required. These can then be used to predict the distribution in more complex geometries through correlation laws. The present work aims at fulfilling such needs. An experimental water loop is used in conjunction to cross-flow air injection to produce bubble clouds and test injection devices.