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Carlo Gualtieri 《Environmental Fluid Mechanics》2006,6(1):1-24
Mass-transfer processes of paramount importance, such as reaeration and volatilization, occur at the air–water interface.
Particularly, volatilization is intensively studied because it can be a relevant removal process for toxic contaminants from
flowing and standing surface waters. The paper provides a comparison among predictive equations available from literature
for standing waters for the case of MTBE contamination. Most of the considered equations tend to overestimate the volatilization
rate, while three equations offer a good fit with the observed data. Finally, these equations are applied to a larger amount
of field data. 相似文献
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Gas transfer through surface water of streams is an effective process for the environmental quality of the aquatic ecosystem.
Several theoretical approaches have been proposed to estimate gas transfer rate. This paper is devoted to present a turbulence-based
model and to compare it with other 3 turbulence-based modeling frameworks that provide an estimation of gas-transfer coefficient
KL at the air-water interface. These models were derived for the reaeration process. In this paper, they have been verified
both for reaeration and volatilization using experimental data collected in a laboratory rectangular flume and in a circular
sewer reach. These data refer to oxygen absorption and cyclohexane volatilization, respectively. Comparison of results for
oxygen shows that the tested models exhibit an average absolute difference between their results and the experimental data
ranging from 12.5% and 25.6%. Also, the scaling analysis of the experimental data support both small-eddy based models and
the model proposed by the authors. Moreover, volatilization results show that the process is also affected by a channel shape
factor, which was, finally, quantified. 相似文献
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