Influence of waves on air-water gas transfer

Ekaterini I. Daniil, John S. Gulliver

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Experiments on air-water gas transfer were performed in a flume with a mechanical wave maker for the determination of the gas-transfer coefficient with waves. Oxygen was used as the transferred gas. The experiments indicate that nonbreaking deep-water gravity waves significantly influence air-water gas transfer. The gas-transfer coefficient was correlated with the wave characteristics. A renewal model was used for the analysis of the data, and the renewal rate was dependent on a wave Reynolds number. The gas-transfer coefficient was linearly dependent upon the product of wave height and wave frequency. This is also equivalent to the gas-transfer coefficient being directly proportional to the wave velocity at the water surface. Comparison with data reported in the literature indicates that a significant portion of the observed gas transfer in wind-wave flume experiments can be attributed to nonbreaking waves. The presence of bubbles or bubble-entraining breaking waves enhances the gas-transfer coefficient considerably. Visual correlation between breaking intensity and the transfer coefficient was good, although the relation has not been quantified.

Original languageEnglish (US)
Pages (from-to)522-540
Number of pages19
JournalJournal of Environmental Engineering (United States)
Volume117
Issue number5
DOIs
StatePublished - Sep 1991

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