Interaction of two nonequal plane parallel jets

El-Banna, Hassan; Sabbagh, J. A.

doi:10.2514/3.9571

Cited by 20 publications

(6 citation statements)

References 5 publications

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“…Research on non-equal parallel jets studied shows that the slower jet was more attracted to the faster jet when the velocity ratio decreased [7]. However, the total momentum, including the velocity and pressure momentum, was still conserved.…”

Section: Introductionmentioning

confidence: 99%

Laser-Doppler measurements of the turbulent mixing of two rectangular water jets impinging on a stationary pool

Wang

Lee

Hassan

et al. 2016

International Journal of Heat and Mass Transfer

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Turbulent mixing of parallel jet flows has broad engineering applications. For example, in Gen IV conceptual nuclear reactors, high-temperature flows mix in the lower plenum before entering the secondary cooling system. The mixing condition needs to be accurately estimated and fully understood. In addition, massive computational works involved in the design process necessitate high-fidelity experimental data sets for benchmarking simulation results. The purpose of this study is to use laser Doppler anemometry, a non-intrusive measuring technique, to evaluate the mixing characteristics of two submerged parallel jets issuing from two rectangular channels. The jets with a small spacing ratio of 3.1 were at room temperature. Flow characteristics including distributions of mean velocities, turbulence intensities, and Reynolds stresses were studied for the cases with equal and non-equal discharge velocities. The merging point (MP) was found to be between y/a = 1.72 and y/a = 3.45. The combining point (CP) was at y/a = 15.52. The Reynolds shear stress, a measure of the intensity of momentum transfer, reached its maximum after the merging point. An uncertainty analysis indicated that the average standard deviations of the streamwise mean velocity U and turbulence intensity Urms at all locations in the five days' measurements were 1.5% and 1.6%, respectively. Spectral analyses including fast Fourier transform, power spectral density estimation and continuous wavelet transform revealed the scale and the evolution in time of varied-size eddies in the mixing region of the flow. Repeating flow structures were observed in different time segments. The experimental data obtained from the LDA measurements of the averaged quantities and transient are not only valid for benchmarking steady-state numerical simulations using turbulence models to solve RANS equations but they also enlarge the database of the experimental data for twin jets.

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Section: Introductionmentioning

confidence: 99%

Laser-Doppler measurements of the turbulent mixing of two rectangular water jets impinging on a stationary pool

Wang

Lee

Hassan

et al. 2016

International Journal of Heat and Mass Transfer

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“…The two jets combine at the combined point, develop as a single jet in the combined region, and eventually display the characteristics of a free jet at a far downstream position. Miller and Comings [35], Tanaka [51] and [52], Ko and Lau [25], Elbanna and Sabbagh [12], Lin and Sheu [33] and Lin and Sheu [34], Nasr and Lai [39], Lai and Nasr [28], Anderson and Spall [4], Anderson et al [3], Fujisawa et al [16], Spall et al [50] and Bunderson and Smith [8] have thoroughly investigated the fundamental characteristics of two plane parallel jets.…”

Section: Introductionmentioning

confidence: 99%

Computational study of periodically unsteady interaction between a wall jet and an offset jet for various velocity ratios

2015

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“…The first region is converging region from nozzle exit to the point where the inner shear layers of the jets merge (termed as the merge point). At the merge point the velocity in the jet flow direction on the symmetry plane is zero and the pressure reaches the highest value [10,11]. The location where the velocity at the symmetry plane reaches its maximum is called the combined point and denotes that the merging region ends and the combined region begins [12,13].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Near-Field Mixing in Parallel Dual Round Jets

Zheng

Xie

Jiang

et al. 2016

International Journal of Aerospace Engineering

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Parallel underexpanded round jets system has been widely used in engineering applications, and the flow field structures are very complex because of the jets interaction. In this paper, we studied the near-field mixing phenomenon in parallel dual underexpanded jets numerically by solving the Reynolds-Averaged Navier-Stokes Equations. The numerical results agree well with experimental data acquired by particle image velocimetry. Similar to plane jets, to some degree, two round jets are deflected towards the dual nozzle symmetry plane; the flow field can also be divided into three regions. Meanwhile, attempts have been made to predict merge point and combine point locations on certain cross profile of computational domain by correlating them with jet spacing and jet pressure ratio. The jet spacing plays an important role in jets interaction, and jet interaction decreases with the increase in jet spacing. The jets interaction in terms of merge (combine) point and pressure varies significantly while the jet spacing differs. Additionally, as pressure ratio increases, the effect of jet interaction decreases, and the merge (combine) point location moves downstream.

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Interaction of two nonequal plane parallel jets

Cited by 20 publications

References 5 publications

Laser-Doppler measurements of the turbulent mixing of two rectangular water jets impinging on a stationary pool

Laser-Doppler measurements of the turbulent mixing of two rectangular water jets impinging on a stationary pool

Computational study of periodically unsteady interaction between a wall jet and an offset jet for various velocity ratios

Numerical and Experimental Investigation of Near-Field Mixing in Parallel Dual Round Jets

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