Chapter
Apr 26, 2012
Gas-Liquid Transfer Rate in Non-isotropic Flows
Author: Zhiyong DuanAuthor Affiliations
Publication: World Environmental and Water Resources Congress 2007: Restoring Our Natural Habitat
Abstract
By comparing Owens-Gibbs formula, Churchill formula and O'Connor-Dobbins formula on the reaeration rate, Covar indicated that the gas-liquid transfer rate in non-isotropic flows is greater than that in isotropic flows with the same flow velocity and water depth. This study explained the reasons theoretically by developing a model of gas-liquid transfer rate in non-isotropic flows. Both the surface renewal rate caused by the turbulence from the air-water interface and that from the water-bed interface were considered to have contributions to the gas-liquid transfer. New relationships between the mixing length and water depth were established and used in non-isotropic flows. Then a new model and the related formula of gas-liquid transfer rate in non-isotropic flows were built. The predictions of this new model have reasonable agreements with the empirical formula in non-isotropic flows. The comparisons between the predictions of the new model and the calculated values from the formula in isotropic flows showed that the former were greater, which was the same as Covar indicated.
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World Environmental and Water Resources Congress 2007: Restoring Our Natural Habitat
Pages: 1 - 8
Copyright
© 2007 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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Zhiyong Duan
S.M.ASCE
Civil Engineering Department, Mississippi State University, Starkville, MS
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