Gas Transfer and Secondary Currents in Open Channels

by John S. Gulliver, (M.ASCE), Univ of Minnesota, Minneapolis, MN, USA,
Martin J. Halverson, Univ of Minnesota, Minneapolis, MN, USA,

Document Type: Proceeding Paper

Part of: Water Forum '86: World Water Issues in Evolution


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 | Wells (oil and gas) | Reynolds number | Fluid flow | Water surface | Water flow | Terrain models | Aeration

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