Echanges de gaz dissous en ecoulements stratifies de gaz et de liquide

Aísa, Luis; Caussade, B.; George, J.; Masbernat, Lucien

doi:10.1016/0017-9310(81)90131-9

Cited by 20 publications

(3 citation statements)

References 14 publications

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“…The introduction of the Reynolds wave number for the prediction of the oxygen transfer coefficient in the proposed model is theoretically consistent, as it is based upon the assumptions by Aisa (1981), Daniil and Gulliver (1991) and George et al (1995). The developed modified model presents an improved tool compared to the vorticity-based model of Daniil and Moutzouris (1995) with the introduction of the Reynolds number for breaking waves.…”

Section: Model Formulationmentioning

confidence: 82%

Gas transfer under breaking waves: experiments and an improved vorticity-based model

Tsoukala

Moutzouris²

2008

Ann. Geophys.

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Abstract. In the present paper a modified vorticity-based model for gas transfer under breaking waves in the absence of significant wind forcing is presented. A theoretically valid and practically applicable mathematical expression is suggested for the assessment of the oxygen transfer coefficient in the area of wave-breaking. The proposed model is based on the theory of surface renewal that expresses the oxygen transfer coefficient as a function of both the wave vorticity and the Reynolds wave number for breaking waves.Experimental data were collected in wave flumes of various scales: a) small-scale experiments were carried out using both a sloping beach and a rubble-mound breakwater in the wave flume of the Laboratory of Harbor Works, NTUA, Greece; b) large-scale experiments were carried out with a sloping beach in the wind-wave flume of Delft Hydraulics, the Netherlands, and with a three-layer rubble mound breakwater in the Schneideberg Wave Flume of the Franzius Institute, University of Hannover, Germany.The experimental data acquired from both the small-and large-scale experiments were in good agreement with the proposed model. Although the apparent transfer coefficients from the large-scale experiments were lower than those determined from the small-scale experiments, the actual oxygen transfer coefficients, as calculated using a discretized form of the transport equation, are in the same order of magnitude for both the small-and large-scale experiments. The validity of the proposed model is compared to experimental results from other researchers.Although the results are encouraging, additional research is needed, to incorporate the influence of bubble mediated gas exchange, before these results are used for an environmental friendly design of harbor works, or for projects involving waste disposal at sea.

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Section: Model Formulationmentioning

confidence: 82%

Gas transfer under breaking waves: experiments and an improved vorticity-based model

Tsoukala

Moutzouris²

2008

Ann. Geophys.

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“…According to the results of Aisa et al (1981) or Jahne et al In other words, the order of magnitude of the thickness of the diffusive sublayer is same as that of the viscous sublayer. Hence, the region of large interfacial turbulence damping corresponds to the concentration boundary layer.…”

Section: Analysis Of Schmidt Numbermentioning

confidence: 77%

Experimental study and parameterization of interfacial gas absorption

1990

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Experiments of simultaneous absorption of carbon dioxide and helium, in transient absorption regimes, have been carried out in a gasliquid flume for stratified-type cocurrent flows. There was a need to improve a method of chromatographic analysis for helium and CO, titrations in the gaseous phase and the liquid phase; this led us to study simultaneous absorption of CO, and He independent of dynamic conditions. In addition the dominant wave characteristics were studied and the interfacial friction velocity was measured. It was confirmed that, for two gases presenting a large contrast in diffusivities, gas absorption rates are related directly to the physical properties of the gases. The mass transfer coefficient varies with the -1 / 2 exponent of the Schmidt number for a large interfacial stress and a clean interface whereas it varies with the -2 / 3 exponent for weaker winds.

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“…A significant progress in the study and modeling of the gas-liquid flows has been achieved and many experimental studies have been carried out during the last decades. The experimental data are used in order to provide suitable correlations of the transfer rate (Aisa et al, 1981;Wanninkhof & Gills, 1999). On the other hand basic experiments had established a local description of the interfacial mass transfer at the gaz-liquid horizontal interface in homogeneous turbulence generated by micro-jets, (George et al, 1994) or by oscillating grid, (Reidel et al, 2004).…”

Section: A) Gas-liquid Mass Transfer Coefficientsmentioning

confidence: 99%