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Detailed experiments have been conducted to obtain information on the basic principles involved in the mechanism of interfacial gas transfer under liquid-side control. Planar concentration fields of the dissolved oxygen near the air-water interface have been quantified in an oscillating-grid tank using the laser induced fluorescence (LIF) technique. The high data resolution reveals the concentration distribution within the concentration boundary layer which is only a few millimeters thick. The measured concentration fields allow the observation of the surface renewal phenomenon. Vertical profiles of mean concentration and fluctuation intensity were obtained from the concentration fields. These profiles supply relevant information to apply models developed to the interface. Key-words: interfacial gas transfer; laser induced fluorescence; oscillating-grid tank; turbulence.

Detalhes da Transferência de Gases na Interface Ar-Água