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Structure and mixin...
Structure and mixing of a meandering turbulent chemical plume: concentration and velocity fields
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Young, D. L. (författare)
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- Larsson, Ann I., 1965 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper, Tjärnö marinlaboratoriet,Department of marine sciences, Tjärnö Marine Laboratory
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Webster, D. R. (författare)
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(creator_code:org_t)
- 2021-11-09
- 2021
- Engelska.
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Ingår i: Experiments in Fluids. - : Springer Science and Business Media LLC. - 0723-4864 .- 1432-1114. ; 62:12
- Relaterad länk:
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- This study presents simultaneous particle image velocimetry (PIV) and laser-induced fluorescence (LIF) measurements of a phase-locked meandering chemical plume, the motion of which is forced by the periodic oscillation of a diverting plate. The plume evolves in a turbulent boundary layer in a moderate-Reynolds-number open channel flow. For the meandering plume, the centerline phase-averaged concentration decreases more rapidly with downstream distance and the plume width increases more rapidly with downstream distance (as x(1)) compared to the straight plume (as x(3/)(4)). Furthermore, the concentration fields and transverse profiles are asymmetric about the plume centerline in the meandering plume. Nevertheless, the transverse profiles can be modeled by a Gaussian shape in a segmented manner. The velocity fields indicate that the large-scale alternating-sign vortices induced by the diverting plate are the dominant feature of the flow. The vortices induce the plume to meander and govern the spatial distribution of the phase-averaged concentration. The induced fluid motion by the vortices also helps in explaining the increased mixing and dilution of the concentration field. Further, a phenomenological model of chemical filament transport by the vortical motion explains local peaks in the phase-averaged concentration along the plume centerline. [GRAPHICS] .
Ämnesord
- NATURVETENSKAP -- Annan naturvetenskap (hsv//swe)
- NATURAL SCIENCES -- Other Natural Sciences (hsv//eng)
Nyckelord
- laser-induced fluorescence
- concentration fluctuations
- dispersion
- flow
- model
- intermittency
- wake
- statistics
- transport
- islands
- Engineering
- Mechanics
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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