Two-dimensional estimation of Reynolds-fluxes and -stresses in a Jet-in-Crossflow arrangement by simultaneous 2D-LIF and PIV

Cárdenas, Camilo; Suntz, Rainer; Denev, Jordan A.; Bockhorn, Henning

doi:10.1007/s00340-007-2734-3

Cited by 40 publications

(11 citation statements)

References 23 publications

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“…Close inspection of the instantaneous images also suggests the same, since the expected 2D shear layer structures on the top of the plume are clearly visible and do not appear smeared due to variation in velocity along the optical axis. These observations are consistent with detailed measurements on nonreacting jets in crossflow (29), which show that velocity variation along the x-axis falls to less than 10% of the wind speed by 12 diameters downstream of the jet origin. Finally the transmissivity of the plume is such that the camera is able to "see" along chords through the plume producing a concentration weighted velocity in which the soot is the tracer for the image correlation measurements.…”

Section: Resultssupporting

confidence: 88%

Quantitative Field Measurement of Soot Emission from a Large Gas Flare Using Sky-LOSA

Johnson

Devillers

Thomson

2010

Environ. Sci. Technol.

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Particulate matter emissions from unconfined sources such as gas flares are extremely difficult to quantify, yet there is a significant need for this measurement capability due to the prevalence and magnitude of gas flaring worldwide. Current estimates for soot emissions from flares are rarely, if ever, based on any form of direct data. A newly developed method to quantify the mass emission rate of soot from flares is demonstrated on a large-scale flare at a gas plant in Uzbekistan, in what is believed to be the first in situ quantitative measurement of soot emission rate from a gas flare under field conditions. The technique, named sky-LOSA, is based on line-of-sight attenuation of skylight through a flare plume coupled with image correlation velocimetry. Monochromatic plume transmissivities were measured using a thermoelectrically cooled scientific-grade CCD camera. Plume velocities were separately calculated using image correlation velocimetry on high-speed movie data. For the flare considered, the mean soot emission rate was determined to be 2.0 g/s at a calculated uncertainty of 33%. This emission rate is approximately equivalent to that of 500 buses driving continuously and equates to approximately 275 trillion particles per second. The environmental impact of large, visibly sooting flares can be quite significant.

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Section: Resultssupporting

confidence: 88%

Quantitative Field Measurement of Soot Emission from a Large Gas Flare Using Sky-LOSA

Johnson

Devillers

Thomson

2010

Environ. Sci. Technol.

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“…Turbulence and penetration data had shown that the responses of spread and penetration seemed to be optimal at St = 0.22 [4]. As shown in Figure 1 [13], five types of large vortex structures are detected in the JICF: the counter-rotating vortex pair (CRVP), the horseshoe vortex (HSV), the wake vortices (WV), the upright vortices (UV), and the ring-like vortices (RLV), which have a great influence on ejected jet control. It is greatly important to clarify the mechanism for the generation of large-scale coherent structures in the proposed development.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 96%

A Comparison of Classical and Pulsating Jets in Crossflow at Various Strouhal Numbers

Chang

Shao²,

et al. 2017

Mathematical Problems in Engineering

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Investigation of the classical and pulsating jet in crossflow (JICF) at a low Reynolds number (Re = 100) has been performed by the LES method based on varied velocity ratios (r= 1~4). Time-averaged particle trajectories are compared in the classical and pulsating JICF. The formation mechanism and the corresponding flow characteristics for the counter-rotating vortex pair (CRVP) have been analyzed. An unexpected “vortex tail” has been found in the JICF at higher velocity ratio due to the enhanced interactions indicated by the increased jet momentum among the CRVP, upright vortices, and shear layers. The analysis of time-averaged longitudinal vorticity including a coupling mechanism between vortices has been performed. The returning streamlines appear in the pulsating JICF, and two extra converging points emerge near the nozzle of the jet at different Strouhal numbers. The temperature profiles based on the iso-surface for the classical and pulsating JICF have been obtained computationally and analyzed in detail.

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“…The velocity field characteristics have captured for velocity ratio of 5.7 and jet exit Reynolds number of 5000. In another work the turbulent fluctuations for JIC were measured using Particles Image velocimetry (PIV) [8]. The mixing process was investigated at cross-flow Reynolds number of 3000 and VR=3.…”

Section: Introductionmentioning

confidence: 99%

Study of Turbulent Models in Jet Impingement at Different Cross-Flow Conditions

Kabeel¹,

Elkelawy²,

Bastawissi³

et al. 2017

Eng. Sci. and Milit. Techno.

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Air impingement jet into main cross stream is countered in numerous modern applications, for example, dryers, pneumatic conveying and spot cooling. The common impact between the jet and the cross stream is analyzed at various jet to cross flow velocity ratio. In the present study, an air jet is impinged at an assortment of velocity ratios into a cross stream. The cross stream is brought out through a 10cm diameter pipe with Reynolds number reaches out 6  10 4 . At the diverse conditions, the flow pattern is simulated numerically with two-equation turbulent models of Realizable k- , SST k- and RSM. The outcome demonstrates that the jet pattern is altogether misshaped as the standard speed is expanded and detachment regions are created. Greater state of turbulent intensity and stresses is seen in the regular face between the stream and cross stream.

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Two-dimensional estimation of Reynolds-fluxes and -stresses in a Jet-in-Crossflow arrangement by simultaneous 2D-LIF and PIV

Cited by 40 publications

References 23 publications

Quantitative Field Measurement of Soot Emission from a Large Gas Flare Using Sky-LOSA

Quantitative Field Measurement of Soot Emission from a Large Gas Flare Using Sky-LOSA

A Comparison of Classical and Pulsating Jets in Crossflow at Various Strouhal Numbers

Study of Turbulent Models in Jet Impingement at Different Cross-Flow Conditions

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