Laser Induced Fluorescence Measurements of Carbon Dioxide Dissolution in Wave-Breaking Turbulence

Watanabe, Yasunori; Otsuka, Junichi; Saruwatari, Ayumi

doi:10.1142/9789814277426_0004

Cited by 2 publications

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References 2 publications

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“…The entrained bubbles increase the total area of airsea interface per unit volume and enhance the gas dissolution into water. Watanabe et al (2008) measured the dissolved carbon dioxide (D-CO 2 ) in breaking waves using a two-color laser induced fluorescence technique, and presented that the distributions of the entrained bubbles in breaking waves highly correlated with the D-CO 2 concentration, and the strong turbulence generated by the threedimensional vortices diffused the bubbles and D-CO 2 in a deeper water region. Therefore, to develop an appropriate model to estimate the gas transfer velocity in a surf zone, we need to characterize the gas dissolution in a surf zone on the basis of the bubble transport process and the transition of the turbulent intensity in breaking waves.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Dissolved Carbon Dioxide Concentration in a Surf Zone

Otsuka

Watanabe

Saruwatari

2011

Int. Conf. Coastal. Eng.

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In this study, we measured dissolved carbon dioxide (D-CO2) concentration in a surf zone in a laboratory wave flume filled with freshwater and seawater using a glass electrode CO2 meter, and also observed the air-water turbulent flow field using Particle Image Velocimetry (PIV). D-CO2 concentration increased with time and the bore region reached a saturated state earlier than the transition region. The gas transfer velocity in the transition region was much higher than that in the bore region since the numerous entrained bubbles trapped within three-dimensional vortices significantly contribute to the gas dissolution into water in the transition region. The gas transfer velocity in a surf zone in freshwater were found to be higher than those in seawater. We estimated the gas transfer velocity in a surf zone from the turbulent energy in breaking waves and the Schmidt number. It was found that the gas transfer velocity could be roughly estimated from the turbulent energy in breaking waves.

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Section: Introductionmentioning

confidence: 99%

Measurement of Dissolved Carbon Dioxide Concentration in a Surf Zone

Otsuka

Watanabe

Saruwatari

2011

Int. Conf. Coastal. Eng.

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Measurement of Oxygen Transfer from Air Bubbles to Water

Niida

Watanabe

2011

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal E

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This paper presents fundamental properties of concentrations of oxygen dissolved from air-bubbles pumped into water with the aim to understand aeration effects to oxygen supply in the surf zone. Fluorescence imaging experiments were performed to identify relations of the local transfer of oxygen and the bubble size distribution. It has been found that the both of spatial distributions and temporal variations of dissolved oxygen were described by the number densities of small bubbles less than 2.0 mm.

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Laser Induced Fluorescence Measurements of Carbon Dioxide Dissolution in Wave-Breaking Turbulence

Cited by 2 publications

References 2 publications

Measurement of Dissolved Carbon Dioxide Concentration in a Surf Zone

Measurement of Dissolved Carbon Dioxide Concentration in a Surf Zone

Measurement of Oxygen Transfer from Air Bubbles to Water

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