Abstract
Recent laboratory measurements of bulk gas-transfer velocity and free-surface hydrodynamics were made for the case of oscillating grid-stirred turbulence. Air-water gas-transfer velocities were determined from the water-side dissolved oxygen mass balance, and an innovative digital particle image velocimetry technique was used to measure the two-dimensional free-surface flow field. Bulk turbulence was found unable to provide a unique relationship for the gas-transfer rates realized, owing predominantly to surface contamination effects (adventitious and/or purposely introduced films). However, it was found that the surface divergence computed from the free-surface velocity field information was capable of reconciling the gas-transfer data in a physically meaningful way. This appears to be evidence confirming that the free-surface divergence is an important process involved in interfacial gas transport.
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