Upstream nozzle shaping effects on near field flow in round turbulent free jets

Quinn, W. R.

doi:10.1016/j.euromechflu.2005.10.002

Cited by 136 publications

(80 citation statements)

References 17 publications

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“…The velocity fluctuations presented were slightly higher than the fluctuations measured in previous research (Ferdman et al, 2000;Quin, 2005) due to the pipe flow used in this research. As mentioned earlier, the ejector pump was used without any flow conditioning to generate a pipe flow to mimic a high turbulence value jet.…”

Section: Pipe Jet Flowcontrasting

confidence: 45%

“…It is seen from the figure that the data taken using the borescopic probe closely matches the data taken by Quin (2005). Quin (2005) conducted experiments using two separate jets, one generated by a contoured nozzle and another generated with a sharp edged nozzle, to study the difference between the flow fields near the jet exit at Reynolds number . In an ideal round jet experiment, the velocity decay constant, , and the spreading rate, , do not vary with Reynolds number.…”

Section: Pipe Jet Flowmentioning

confidence: 82%

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A borescopic laser Doppler velocimetry probe

O'Brien¹,

Ölçmen²

2014

Meas. Sci. Technol.

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A miniature fiber-optic, single-velocity-component Laser Doppler Velocimetry (LDV) probe for measurement in cramped spaces, where access is very limited, has been designed, constructed, and tested. The probe design allows the main probe dimensions to be small (7mm in diameter). In addition, the proposed back-scatter collection scheme allows the main section to be as long as needed to access remote locations. The laser beams are first collimated by passing them through two separate collimating lenses. The collimated light then passes through 1 mm holes machined into a right angle prism-mirror and are focused to form the measurement probe volume using the focusing lens placed at the end of the probe extension tube. The light scattered by the particles in the flow is collected back by the focusing lens and is collimated. The collimated light then reflects off the right-angle mirror by 90 degrees, passes through the receiving lens, and is focused to the receiving fiber terminator. The receiving fiber-optic cable transmits the collected light to the photo-multiplier tube which then converts the signal into an electrical signal for further processing of the data. The probe working principle was proven in two types of jet flows.iii

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Section: Pipe Jet Flowcontrasting

confidence: 45%

Section: Pipe Jet Flowmentioning

confidence: 82%

A borescopic laser Doppler velocimetry probe

O'Brien¹,

Ölçmen²

2014

Meas. Sci. Technol.

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“…(2000) used three different orifice nozzles-square-, standard-, and sharp-edged-and demonstrated that the edge configuration of orifice nozzles affects the heat transfer characteristics of jet impingement. Quinn (2006) also demonstrated the effects of nozzle configurations on the mixing characteristics by measuring the mean velocity and pressure distributions for orifice and contoured-nozzle jets. Zhou et al (2006) investigated the flow structure and the heat transfer characteristics of an orifice impinging jet with various mesh screens installed inside the nozzle.…”

Section: Introductionmentioning

confidence: 99%

“…Antonia & Zhao (2001) examined two circular jets-a pipe jet with a fully developed turbulent flow profile and a contraction jet with a laminar top-hat velocity profile at the nozzle exit-and discussed the similarities and differences between the two. Quinn (2006) demonstrated the effects of nozzle configurations on the mixing characteristics from the mean velocity and pressure distributions of an orifice plate and contoured nozzle jets. Mi et al (2001) investigated the mixing characteristics and physical mechanisms of jets issuing from an orifice plate using flow visualization images and temperature measurements in comparison with a contoured nozzle and a pipe and found that the mixing rate of the orifice plate jet was higher than that of the others.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement of Impinging Jet by Notched – Orifice Nozzle

Shakouchi¹,

Kito²

2012

An Overview of Heat Transfer Phenomena

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“…In the field of fundamental and applied research on turbulent jets, it was observed that the characteristics of initial shear layers and of the subsequent vortices which are formed in the near field of the jet are directly related to the inlet conditions governed by an intentional and/or an accidental excitation of the shear layer [1][2][3][4][5][6]. Active [7][8][9] or passive [10][11][12][13] alteration of the initial conditions causes considerable modifications of the large-scale vortices in both their shape and convection velocities.…”

Section: Introductionmentioning

confidence: 99%

Impinging cross-shaped submerged jet on a flat plate: a comparison of plane and hemispherical orifice nozzles

et al. 2015

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To cite this version:Kodjovi Sodjavi, Brice Montagné, Pierre Bragança, Amina Meslem, Florin Bode, et al.. Impinging cross-shaped submerged jet on a flat plate: a comparison of plane and hemispherical orifice nozzles. Meccanica, Springer Verlag, 2015, pp.1-21. 10 AbstractIt is well known that the transfer of heat, mass and momentum to a wall by an impinging jet is partially linked to the way in which jet generation is realized. The organization of the vortices at the jet exit depends on the upstream conditions and on the geometry of the nozzle. Particle Image Velocimetry (PIV) and electrodiffusion techniques were used to investigate the characteristics of different impinging jets and the resulting wall shear rates and mass transfer. Two Cross-Shaped orifice jets, one produced by a plane orifice nozzle (i.e. a Cross-Shaped Orifice made on a flat Plate, CO/P) and the second by a hemispherical orifice nozzle (i.e. a Cross-Shaped Orifice made on a Hemisphere, CO/H), were compared to a reference round jet produced by a convergent nozzle. The distance between the jet exit and the target wall was equal to two nozzle equivalent diameters (De), based on the free orifice area. The Reynolds number, based on De and on the exit bulk-velocity, was 5620 for each flow. PIV measurements give an overall view of the flow characteristics in their free and wall regions. The switching-over phenomena observed in the CO/P nozzle case, and already described in the literature with similar nozzles, did not occur in the jet from the CO/H nozzle. Electrodiffusion measurements showed differences in the shape and level of radial distribution of the wall shear rates and mass transfer. One of the most important observations is the large difference in wall shear stress between the three jets. For the same exit bulk-velocity, the maximum wall shear rate in the CO/P and CO/H nozzle jets was almost two and three times higher, respectively, than that of the reference convergent jet. This higher wall shear rate is accompanied

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Upstream nozzle shaping effects on near field flow in round turbulent free jets

Cited by 136 publications

References 17 publications

A borescopic laser Doppler velocimetry probe

A borescopic laser Doppler velocimetry probe

Heat Transfer Enhancement of Impinging Jet by Notched – Orifice Nozzle

Impinging cross-shaped submerged jet on a flat plate: a comparison of plane and hemispherical orifice nozzles

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