Publicou 8 edições por ano
ISSN Imprimir: 2150-3621
ISSN On-line: 2150-363X
Indexed in
EXPERIMENTAL AND COMPUTATIONAL STUDY OF THE EFFECT OF DIFFUSION ORDER IN AERATION SYSTEMS
RESUMO
The rising of air bubbles in water is essential for many engineering applications. This importance comes from the need to keep the oxygen in water at certain levels. When considering these applications, the first question that arises is how to increase the rate of oxygen transfer and make the process more efficient. In this study, it was shown that diffused bubbles in water have a significant influence on the aeration efficiency. When rising in water, these bubbles will convert the stagnant condition to rotational flow with high vorticity and circulation, which will increase the mixing and the rate of oxygen transfer. An experimental study was conducted to obtain the standard oxygen transfer efficiency (SOTE). A computational study was conducted to obtain vorticity and circulation. The SOTE obtained from the experimental approach is considered as a measure of the aeration efficiency. The vorticity and circulation were determined from the computational fluid dynamics (CFD) as a measure of the extent of mixing in the aeration tank. From both experimental and CFD results, it was proven that the method used to diffuse the air from the subsurface diffusion system can alter the system efficiency. Staggered and in-line diffusion orders were investigated. Based on the experimental and CFD results, the staggered diffusion method has a better influence on the aeration efficiency than the in-line mode.
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