Gas Transfer and Secondary Currents in Open Channelsby John S. Gulliver, (M.ASCE), Univ of Minnesota, Minneapolis, MN, USA,
Martin J. Halverson, Univ of Minnesota, Minneapolis, MN, USA,
Abstract: Laboratory flume experiments on water-wide controlled gas transfer, such as reaeration, are described. The experiments indicate that gas transfer is a surface renewal process, well described by P. V. Dankwerts' model, as originally proposed by D. J. O'Connor and W. E. Dobbins. The primary cause of surface renewal in flumes is proposed to be the upwelling of secondary currents and is documented by relating measurements of these currents to gas transfer measurements. A dimensionless liquid film coefficient is related to a shear Peclet number and a shear Reynolds number. The shear Reynolds number represents the effectiveness of secondary currents in penetrating the water surface.
Subject Headings: Open channels | Fluid flow | Gas flow | Water flow | Water surface | Flumes | Reynolds number | Wells (oil and gas) | Aeration | North America | Georgia | United States
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