Visualization of particle displacement and flow in stratified salt water

Gärtner, Uwe

doi:10.1007/bf00282269

Cited by 9 publications

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“…The vortex dipole thickness H was measured using a simple technique proposed by Gartner (1983). Observations demonstrate that after the dipole has been formed (t > to) its thickness R does not vary with time, hence f (~~, T * ) = const.…”

Section: Vortex Dipole Characteristicsmentioning

confidence: 99%

“…In our previous experiments(Voropayev & Filippov 1985) the thickness H of the front region was not measured. Using the simple technique proposed byGartner (1983) we have made these measurements and the results are shown in figure 12 in a non-dimensional form (the values of ro for different z a n d J were calculated using the relation (2.12) and the graph infigure 11).Introducing the Reynolds number of the front regionRe = 2RO/v = apAJ (2.20), (2.22) we have a simple estimate for the 'age' of the flow : t = Z/20. (2.24)…”

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Horizontal jets and vortex dipoles in a stratified fluid

1991

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When a horizontal force is applied locally to some volume of a viscous densitystratified fluid, flows with high concentration of vertically oriented vorticity (vortex dipoles) are generated. The processes of generation and evolution with time of these unsteady flows in a stratified fluid are studied. A convenient way to produce and study these flows in the laboratory is to use a submerged horizontal jet as a ‘point’ source of momentum. The main governing parameter (the ‘force’) is easily controlled in this case. Two regimes were studied: starting jets with dipolar vortex fronts (the force acts continuously) and impulsive vortex dipoles (the force acts for a short period of time). A conductivity microprobe, aluminium powder, shadowgraph, thymol-blue and other techniques have been used to measure the velocity and density distributions in the flows. It is found that in both regimes the flows are self-similar: the lengthscale of the flows increases with time as t½ for starting jets and as t1/3 for vortex dipoles. Detailed information about the generation mechanism, kinematics and dynamics of the flows is obtained. On the basis of similarity principles a theoretical explanation of the experimental results is given. The theory is in good agreement with the results obtained.

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Section: Vortex Dipole Characteristicsmentioning

confidence: 99%

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confidence: 99%