Mixing efficiency in controlled exchange flows

Tjipto Prastowo; Ross W. Griffiths; Graham O. Hughes; Andrew M.C.C. Hogg

doi:10.1017/S0022112008000554

Mixing efficiency in controlled exchange flows

Tjipto Prastowo^*, Ross W. Griffiths, Graham O. Hughes, Andrew M.C.C. Hogg

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Turbulence and mixing are generated by the shear between two counter-flowing layers in hydraulically controlled buoyancy-driven exchange flows through a constriction. From direct measurements of the density distribution and the amount of turbulent mixing in steady laboratory exchange flows we determine the overall efficiency of the mixing. For sufficiently large Reynolds numbers the mixing efficiency is 0.11(±0.01), independent of the aspect ratio and other details of constriction geometry, in good agreement with a scaling analysis. We conclude that the mixing in shear flows of this type has an overall efficiency significantly less than the maximum value widely proposed for stratified turbulence.

Original language	English
Pages (from-to)	235-244
Number of pages	10
Journal	Journal of Fluid Mechanics
Volume	600
DOIs	https://doi.org/10.1017/S0022112008000554
Publication status	Published - 10 Apr 2008

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AU - Prastowo, Tjipto

AU - Griffiths, Ross W.

AU - Hughes, Graham O.

AU - Hogg, Andrew M.C.C.

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N2 - Turbulence and mixing are generated by the shear between two counter-flowing layers in hydraulically controlled buoyancy-driven exchange flows through a constriction. From direct measurements of the density distribution and the amount of turbulent mixing in steady laboratory exchange flows we determine the overall efficiency of the mixing. For sufficiently large Reynolds numbers the mixing efficiency is 0.11(±0.01), independent of the aspect ratio and other details of constriction geometry, in good agreement with a scaling analysis. We conclude that the mixing in shear flows of this type has an overall efficiency significantly less than the maximum value widely proposed for stratified turbulence.

AB - Turbulence and mixing are generated by the shear between two counter-flowing layers in hydraulically controlled buoyancy-driven exchange flows through a constriction. From direct measurements of the density distribution and the amount of turbulent mixing in steady laboratory exchange flows we determine the overall efficiency of the mixing. For sufficiently large Reynolds numbers the mixing efficiency is 0.11(±0.01), independent of the aspect ratio and other details of constriction geometry, in good agreement with a scaling analysis. We conclude that the mixing in shear flows of this type has an overall efficiency significantly less than the maximum value widely proposed for stratified turbulence.

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JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

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Mixing efficiency in controlled exchange flows

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