Temperature Dependence of Liquid Film Coefficient for Gas Transfer

Daniil, Ekaterini I.; Gulliver, John S.

doi:10.1061/(asce)0733-9372(1988)114:5(1224)

Cited by 41 publications

(21 citation statements)

References 12 publications

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“…Transfer coefficients were normalized to 20 • C, assuming a square-root dependence on the Schmidt number Sc, according to the equation given by Daniil and Gulliver (1988).…”

Section: Discussionmentioning

confidence: 99%

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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“…Transfer coefficients were normalized to 20 • C, assuming a square-root dependence on the Schmidt number Sc, according to the equation given by Daniil and Gulliver (1988).…”

Section: Discussionmentioning

confidence: 99%

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

Tsoukala

Moutzouris²

2008

Ann. Geophys.

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“…This said, while the absolute values of K L derived from theoretical models depend on empirically derived constants, the relative change in K L due to temperature (K LT1 /K LT2 ) generally does not . Daniil and Gulliver (1988) correctly reported inadequacy between Dobbins' model and some old empirical data regarding the role of turbulence, but they only plotted the limits of the model, which provided a nice envelop around all available data point, exactly what you would expect the model to do, should it be comparable to the experimental data points (see Fig. S3).…”

Section: 1mentioning

confidence: 95%

“…Daniil and Gulliver, 1988;Urban and Gulliver, 2000;Gualtieri et al, 2002), empirical models of the reaeration coefficients need corrections for temperature.…”

Section: Theoretical Versus Empirical Equations and Direct Measuremenmentioning

confidence: 99%

“…To our knowledge, no response from Metzger followed. Only Daniil and Gulliver (1988) reported some qualitative experimental discrepancies with the DobbinseMetzger model and concluded that the effect of turbulence intensity on the temperature correction coefficient q had still to be clarified. Generally, the DobbinsMetzger results have been widely accepted contrary to other heavily criticised results such as Howe (1977;cf Brown and Stenstrom, 1980;Rathbun, 1981) and Chao et al (1987a,b;cf Daniil and Gulliver, 1989a,b;Rathbun, 1989a,b;Wilcock and McBride, 1989).…”

Section: 5mentioning

confidence: 99%

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Temperature dependence of stream aeration coefficients and the effect of water turbulence: A critical review

Demars

Manson

2013

Water Research

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“…To provide a uniform basis of comparison of different systems, K L a is evaluated at standard conditions (Conway and Kumke 1966;Pillai et al 1971;Daniil and Gulliver 1988). At standard conditions (clean water at 20 °C temperature and 1 atmosphere pressure), volumetric oxygen transfer coefficient can be evaluated as where K L a = volumetric oxygen transfer coefficient (s −1 ) at temperature 20 °C and pressure of 1 atmosphere and T = Test temperature of water (°C).…”

Section: Oxygen Transfer Parametersmentioning

confidence: 99%

Oxygen transfer study and modeling of plunging hollow jets

2018

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Experiments were performed to study the effect of jet angle of hollow jet aerators on oxygen transfer of water. Three jet angles of 30°, 45° and 60° were used to produce hollow jets impingement on the water in the pool. Results from experimental study showed a significant effect of hollow jet angle on volumetric oxygen transfer coefficient (K L a) at higher jet velocities. Standard oxygen transfer efficiency (SOTE) of 60° hollow jet aerators is observed higher with low-kinetic-power jets, but at higher kinetic power, 30° hollow jet aerator is observed to be the best in terms of SOTE. Moreover, modeling performance of the experimental data is evaluated by training and testing of the models, and empirical equations derived from multiple linear and multiple nonlinear regression techniques are compared with artificial neural network approach. The results of the present study are also compared with the previous studies of plunging jet aerators.

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Temperature Dependence of Liquid Film Coefficient for Gas Transfer

Cited by 41 publications

References 12 publications

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

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

Temperature dependence of stream aeration coefficients and the effect of water turbulence: A critical review

Oxygen transfer study and modeling of plunging hollow jets

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