Turbulent Water Aeration: Analytical Approach and Experimental Data

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by Harry Edmar Schulz, Univ of Sao Paulo, Sao Carlos, Brazil,
José Roberto Bicudo, Univ of Sao Paulo, Sao Carlos, Brazil,
Antenor Rodrigues Barbosa, Univ of Sao Paulo, Sao Carlos, Brazil,
Marcius F. Giorgetti, Univ of Sao Paulo, Sao Carlos, Brazil,

Document Type: Proceeding Paper

Part of: Air-Water Mass Transfer

Abstract: Analytical studies based on the statistical theory of turbulence were carried out in order to identify some relevant parameters which may be associated with the reaeration rate coefficient of turbulent waters. These led to the conclusion that the energy dissipation rate and a length scale called segregation scale may be among these parameters. Mathematical models expressing the relationship between the oxygen transfer rate and the above mentioned parameters were developed. Theoretical considerations involving the segregation scale and the scale of the eddies were made in an attempt to simplify the proposed model. The trend observed for model results related to energy dissipation was verified for independent experimental systems, and the dimensional similarity between the length scale and artificial roughness allowed a preliminary estimate of the suggested trend.

Subject Headings: Parameters (statistics) | Mathematical models | Aeration | Energy dissipation | Scale models | Fluid flow | Turbulence |

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