Flow Visualization Experiments of Inclined Slot Jets with Negative Buoyancy

Papakonstantis, Ilias G.; Mylonakou, Evgenia L.

doi:10.1007/s40710-021-00546-8

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…To do it we had to reformat the Froude number using the slot width d instead of half the slot width used by the other authors, as we did in the present work. There one can see that our data compare well with those by Papakonstantis and Mylonakou (2021) who have used a different 2-D jet generating arrangement in a much bigger dispersion tank. Our data deviate from those of Baines et al (1990) that are 15% higher, and are quite different from the measurements by Zhang and Baddour (1997) and Hunt et al (2019).…”

Section: Resultssupporting

confidence: 87%

“…In the present experiment the slot length to width ratio was variable because we kept the length L=20 cm while the width varied from 0.05 cm to 0.25 cm, thus obtaining L/d= 80 to 400. Our steady state height results are neat to those by Papakonstantis and Mylonakou (2021) but the maximum height is somewhat higher.…”

Section: Resultssupporting

confidence: 66%

“…Video recording has been analyzed using Matlab ® and the time history of the maximum penetration height was extruded. The flow was found to be quite complex because of the interaction of oppositely moving liquids, and this instability drives the descending fluid to oscillate left and right of the injection slot.The terminal penetration height varied around a value1.15 l m that is near the measurements byPapakonstantis and Mylonakou (2021), but deviated from the measurements of other authors for Froude numbers from 40 to 100. Also, the maximum penetration height was found around 1.60 l m and occurred around an average dimensionless time tB/M=2.2.…”

contrasting

confidence: 73%

“…This inconsistency stems from the fact that Baines, et al (1990), Zhang andBaddour, (1997), Srinarayana, et al (2010) and Hunt, et al (2019) used the half-width of the slot to calculate the dimensionless parameters. This methodology, however, goes against the physical characteristic scales derived by dimensional analysis and used by earlier researchers like Kotsovinos (1975) and Fischer et al (1979) and the most recent one by Papakonstantis and Mylonakou (2021).…”

Section: Introductionmentioning

confidence: 99%

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Vertical Plane Buoyant Jets and Fountains in a Uniform Stagnant Ambient Revisited

Minos

Papanicolaou

2021

Preprint

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Planar, vertical buoyant jets are of particular interest, both for research and practical purposes for being related to the disposal of the effluent from wastewater treatment plants or saline, a by-product from desalination plants into a body of stagnant fluid. Analytical, closed form solution is derived for plane buoyant jets based on a buoyant jet width parameter proposed by List and Imberger (1973), and compares to earlier laboratory experiments satisfactorily. The derived entrainment coefficient as a function of the local Richardson number of the flow, takes two asymptotic values for jet-like and plume-like flows, while in fountains it takes values lower than that in jets. Laboratory experiments were performed to measure the penetration height of vertical plane fountains with initial Froude number in the range 20 to 130 using shadowgraph and Planar Laser Induced Fluorescence (PLIF) techniques. Interest was focused on the maximum and terminal, steady-state penetration height before the flow direction reversed. The flow was found to be in a state of unstable equilibrium, as it deviated from the vertical axis, swinging on either side. The equations of motion have been solved numerically using the derived entrainment coefficient function, and the results are congruent to earlier and present experiment for vertical fountains.

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