Oxygen Transfer through Air Entrainment over Stepped Weir

Jin Hong Kim

doi:10.4028/www.scientific.net/AMM.744-746.2297

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 744-746Oxygen Transfer through Air Entrainment over...

Oxygen Transfer through Air Entrainment over Stepped Weir

Abstract:

Oxygen transfer through the air entrainment over the stepped weir by the flow types was presented through the laboratory experiments. In the nappe flow, dominant flow features included an enclosed air pocket, a free-falling nappe impact and subsequent hydraulic jump on the downstream step. Most air was entrained through a free-falling nappe impact and a hydraulic jump. In the skimming flow, air entrainment occurs from the step edges. Downstream of the inception point, the flow is highly aerated at each and every step with very significant splashing. The average values of the oxygen transfer efficiency in the region of the nappe flow and of the skimming flow are about 0.40 and 0.28, respectively. The stepped type of the weir was found to be efficient for water treatment associated with substantial air entrainment.

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Periodical:

Applied Mechanics and Materials (Volumes 744-746)

Pages:

2297-2300

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.744-746.2297

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Online since:

March 2015

Authors:

Jin Hong Kim*

Keywords:

Air Entrainment, Nappe Flow, Oxygen Transfer, Skimming Flow, Stepped Weir

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References

[1] T. Henry (1985). Air-water flow in hydraulic structures. A Water Resources Technical Publication, Engineering Monograph No. 41, pp.251-285.

Google Scholar

[2] H. Chanson (1993). Self-aerated flows on chute and spillways., Journal of the Hydraulics Division, ASCE, Vol. 119, No. 2, pp.220-243.

Google Scholar

[3] J.H. Kim (2003).

Google Scholar

[4] S.T. Avery and P. Novak, (1978). Oxygen transfer at hydraulic structures., Journal of the Hydraulics Division, ASCE, Vol. 104, No. 11, pp.1521-1540.

DOI: 10.1061/jyceaj.0005100

Google Scholar

[5] J.S. Gulliver, J.R. Thene, and A.J. Rindels, (1990). Indexing gas transfer in self-aerated flows., Journal of the Environmental Engineering, ASCE, Vol. 116, No. 3, pp.503-523.

DOI: 10.1061/(asce)0733-9372(1990)116:3(503)

Google Scholar

[6] H. Chanson and L. Toombes (2004). Hydraulics of stepped chutes: The transition flow., Journal of the Hydraulic Research, IAHR, Vol. 42, No. 1, pp.43-54.

DOI: 10.1080/00221686.2004.9641182

Google Scholar