Experiments on a turbulent jet in a cross flow

Kamotani, Y.; Greber, Isaac

doi:10.2514/6.1972-149

Cited by 71 publications

(104 citation statements)

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“…For R ¼ 6, the maximum velocity appears at y ¼ 10:54D, while the maximum temperature appears at y ¼ 10:46D when x=D ¼ 10. This has also been confirmed by measurements including those of Ramsey and Goldstein (1972), Kamotani and Greber (1972), and numerical predictions by Demuren (1983). In the region of x=D < 20, the velocity trajectory and temperature trajectory rise distinctively; while in the region of x=D > 20, both are stabilized and practically form a horizontal line developing downstream.…”

Section: Trajectorysupporting

confidence: 63%

“…During the experiments, the core of the jet is actually a region with high velocity gradients, and the peak streamwise velocity occurs not in the jet but in the crossflow, caused by the acceleration of the latter around the jet. Kamotani and Greber (1972) found that for R ¼ 4e10, the velocity trajectory of a round buoyant jet was well correlated by…”

Section: Trajectorymentioning

confidence: 93%

“…Jets issuing into unconfined (semi-infinite) crossflow include higher temperature air discharges from cooling towers or chimney stacks into the atmosphere, sewage or waste into water bodies and film-cooling of turbine blades, etc. Earlier investigations have mostly focused on free jets, on which the jet trajectory (Subramanya and Porey, 1984;Huang et al, 1994), the mean flow and several higher-order turbulent statistics (Kamotani and Greber, 1972;Andreopoulos and Rodi, 1984) were studied. Other characters such as the spreading rates, bifurcation and trailing vortex phenomena were numerically simulated by Huai et al (1998).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of round thermal discharging in a flowing environment

Chen

Huai

2008

Journal of Hydro-environment Research

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Section: Trajectorysupporting

confidence: 63%

Section: Trajectorymentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Characteristics of round thermal discharging in a flowing environment

Chen

Huai

2008

Journal of Hydro-environment Research

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“…The CRVP has been extensively studied : mixing rate 7,23,37,48 , circulation decay 7,21,48 , vortex cores trajectory 11 , jet spreading 18 . The auto-induction between the CRVP branches ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Transition scenario of the round jet in crossflow topology at low velocity ratios

Cambonie

Aider

2014

Physics of Fluids

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We study experimentally a round Jet In CrossFlow (JICF) at low values of the jetto-crossflow velocity ratio R using instantaneous and time-averaged three-dimensions three-components (3D3C) velocimetry. The difference between instantaneous and time-averaged swirling structures of the JICF is emphasized. Through the analysis of spatial distribution of instantaneous transverse and longitudinal vortices the main transitions of the JICF are characterized for 0.15 < R < 2.2. A new transition at very low velocity ratio is found (R < 0.3). When R is large enough (R > 1.25), the classic JICF topology is recovered. In between, a deformation of the classical JICF topology is observed consisting in a progressive disappearance of the leading-edge vortices, a bending of the jet trajectory and thus a strengthened interaction with the boundary layer. toward the wall. Thanks to a state-of-the-art review on the JICF topology and using visualizations of the flow structures extracted from our experimental volumetric velocimetry measurements, this article provides a complete transition scenario of the JICF topology from the high velocity ratios to the lowest ones, and gives the topological transition threshold associated with each kind of vortex. a)

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“…* is the dimensionless shear stress (D./2~Uoj)' Note the conditions (25) does not imply stress-free at the boundary. Insteaa of (26) …”

Section: Formation Of Contrarotatin~ Vorticesmentioning

confidence: 99%