Surface Renewal Due to Large Flow Structures in Open Channel Flow

by Aldo Tamburrino, Univ of Chile, Santiago, Chile,
John S. Gulliver, Univ of Chile, Santiago, Chile,

Document Type: Proceeding Paper

Part of: Air-Water Mass Transfer

Abstract: It is shown that under certain flow conditions, surface renewal cannot be understood as an exclusive result of the bursting occurring near the wall, as proposed by several authors. Flow visualization in the bulk of the fluid and at the free surface are used in conjunction with filtered turbulence measurements to identify large streamwise vortices as an important transport mechanism in the bulk of the flow. Surface photos indicate that the momentum of the upwelling of large coherent flow structures should not be discounted as an important mechanism of surface renewal through replacement and thinning of the concentration boundary layer near the free surface.

Subject Headings: Free surfaces | Overland flow | Boundary layers | Fluid flow | Open channel flow | Flow measurement | Free flow | Flow visualization

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