Free surface rise and fall due to wall turbulent structures

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Turbulent structures near the wall and the the surface have been studied in open channel flows using oxygen bubble visualization techniques. Experiments indicate that the flow is dominated by the generation of wall ejections and interactions of such structures with the free surface. The ejections are seen to evolve near the wall, reach the free surface, form surface patches, roll back and mix into the bulk flow. Furthermore, there are evidence of ``horseshoe`` and ``hockeystick`` type vortices in relation to the bursting events. Measurements of surface characteristics show that the ejection-inflow events are associated with deformation of the free surface. ... continued below

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9 p.

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Rashidi, M. December 20, 1996.

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Description

Turbulent structures near the wall and the the surface have been studied in open channel flows using oxygen bubble visualization techniques. Experiments indicate that the flow is dominated by the generation of wall ejections and interactions of such structures with the free surface. The ejections are seen to evolve near the wall, reach the free surface, form surface patches, roll back and mix into the bulk flow. Furthermore, there are evidence of ``horseshoe`` and ``hockeystick`` type vortices in relation to the bursting events. Measurements of surface characteristics show that the ejection-inflow events are associated with deformation of the free surface. It is seen that as ejections reach the free surface, the surface goes through a rise, whereas the surface falls when the inflowing fluid returns toward the wall. These effects are enhanced as the flow Reynolds number is increased.

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9 p.

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OSTI as DE98050232

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  • Pacific symposium on flow visulaization and image processing, Honolulu, HI (United States), 23-26 Feb 1997

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  • Other: DE98050232
  • Report No.: UCRL-JC--126098
  • Report No.: CONF-9702107--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 632805
  • Archival Resource Key: ark:/67531/metadc698052

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  • December 20, 1996

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 30, 2015, 8:49 p.m.

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Rashidi, M. Free surface rise and fall due to wall turbulent structures, article, December 20, 1996; California. (digital.library.unt.edu/ark:/67531/metadc698052/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.