Investigation of two plane parallel jets

El-Banna, Hassan; Gahin, S.; Rashed, M.M.

doi:10.2514/3.8187

Cited by 88 publications

(23 citation statements)

References 10 publications

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“…The measured combined length ofxep/w = 30 for ventilated two parallel jets with s/w = 12.5, is significantly higher than that ofxep/w = 19 for unventilated jets with s/w = 11.25. This 63% longer combined length agrees with the results of Lin and Sheu (1991), Elbanna et al (1983) and Marsters (1977). However, the merging length cf xrnp/w = 12 for ventilated jets of Elbanna (1983) measured by hot-wire is shorter than the merging length xrnp/w = 12.5 of the unventilated jets measured by LDA in the present study.…”

Section: Comparison Of Unventilated and Ventilated Two Parallel Planesupporting

confidence: 77%

“…13 that, near the nozzle exit, the decay of the local maximum streamwise velocity UmlUo is similar for both unventilated and ventilated jets and as the flow approaches the merging point, it becomes greater for the former. -0.3 _.I-r"T"""r-T"""T""T""-'r""'T'""T'""'T""-'r""'T'"T""T"'T""'1r-T""+- Figure 14 compares the LDA results of the mean streamwise velocity along the x-axis, VelUo, for unventilated two parallel jets with s/w = 11.25 with the hot-wire results of Elbanna et al (1983) for ventilated two parallel plane jets with s/w = 12.5. It can be seen that, for ventilated jets, the normalised secondary flow velocity along the x-axis, VJVo, is about 0.14 at the nozzle exit and decreases with x/w down to a value of about 0.06 at the merging point (xmp/w = 12).…”

Section: Comparison Of Unventilated and Ventilated Two Parallel Planementioning

confidence: 99%

“…This has not been quantitatively examined by previous researchers and will, therefore, be considered here. Figure 13 depicts the mean streamwise velocity profiles UlUo for unventilated two parallel jets with s/w = 11.25 and those of ventilated jets with s/w = 12.5 measured by Elbanna et al (1983) using constant temperature hotwire anemometry. Here, the ordinate is normalised by the lateral distance (s) between the nozzles.…”

Section: Comparison Of Unventilated and Ventilated Two Parallel Planementioning

confidence: 99%

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Weakly Interacting Two Parallel Plane Jets

Lai

Nasr

2000

Laser Techniques Applied to Fluid Mechanics

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Abstract. The mean velocity field of unventilated two parallel plane jets for large nozzle spacing ratios has been studied using a two-component laser Doppler anemometer. Results show that by comparison with small s/w (less than 5), the interactions between the inner shear layer and the recirculation zone for large s/w are weaker. The initial peaks of turbulence intensities and Reynolds shear stress corresponding to the nozzle inner and outer edges tend to persist downstream from the location of the vortex centre without being overwhelmed by the influences caused by the recirculating flow in the recirculation zone. The lateral turbulence intensities and Reynolds shear stress in the outer shear layer spread and decay more rapidly than in the inner shear layer. The attraction of the two individual jets towards each other is clearly illustrated by the mean velocity vector field and supported by static pressure measurements. Comparisons of the results of the unventilated jets with those of ventilated jets in the literature indicate there is no recirculation zone in the ventilated jets and the unventilated jets combine to develop into a single free jet much earlier than ventilated jets.

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Section: Comparison Of Unventilated and Ventilated Two Parallel Planesupporting

confidence: 77%

Section: Comparison Of Unventilated and Ventilated Two Parallel Planementioning

confidence: 99%

Section: Comparison Of Unventilated and Ventilated Two Parallel Planementioning

confidence: 99%

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Weakly Interacting Two Parallel Plane Jets

Lai

Nasr

2000

Laser Techniques Applied to Fluid Mechanics

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“…He described the basic flow patterns and entrainment mechanism of parallel jets. Elbanna et al [3] showed that the mean velocity profile of the parallel jets agreed well with the single jet in the region downstream of the combined point. Lin et al [4] [5] used hot-wire anemometry to show that the mean velocity approaches self-preservation in both the merging and combined regions, while Reynolds shear stresses approach self-preservation in the combined region only.…”

Section: Introductionmentioning

confidence: 81%

Prediction on Turbulent Flow of Two Parallel Plane Jets Using κ-ε Model

Mohapatra¹

2017

OALib

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In the present study, computational details of two parallel plane jets with nozzle separation ratio = 4.25 and Re = 11,000 are presented. A study of the turbulence has also been done. The computational domain size, grid resolution, and different discretization schemes on the predictions are discussed. The existence of a recirculation flow region, a merging region and a combined region in the two parallel plane jets configuration has been predicted qualitatively by κ ε − model. Power law scheme is used for discretizing the convective terms. Calculations were made using a Power law scheme. A code is used to solve a laminar, two dimensional viscous fluid flow and heat transfer. At the last it is shown that this code is ready to use for modification for mean flow solution of the turbulent two parallel plane jets. The numerical results are compared with the experimental results. Computational details of various mean flow and turbulent parameters are presented and described with separation ratio of 4.25 and Re = 11,000. The results are compared with Nasr and Lai and are found to be in good agreement with it. The two parallel plane jets develop like a single free jet in the combined region. The outer shear layer spreads faster than the inner shear layer in the near field. Subject AreasMechanical Engineering

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“…In addition, the static pressure distribution is not affected by the Reynolds number variation for 8600≤ Re≤15700. Elbanna and Gahin (1982) experimentally investigated the merging between two parallel jets. They measured the mean velocity, the turbulence intensity and the Reynolds shear stress.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study and Correlations Development on Twin-Parallel Jets Flow With Non-Equal Outlet Velocities

Kolsi¹,

Hnaien²,

Marzouk³

et al. 2018

Frontiers in Heat and Mass Transfer

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The purpose of the present paper is to numerically investigate two plane turbulent parallel jets using CFD model. A parametric study was carried out to evaluate the simultaneous effect of the nozzle spacing and the velocity ratio on the merge point (MP), the combined points (CP) as well as the upper (UVC) and lower (LVC) vortices centers positions. Results show that the velocity ratio significantly affects twin-parallel jets flow structure. In fact, increasing the velocity ratio moves the MP, CP, UVC and LVC further upstream along the longitudinal direction while deflecting toward the stronger jet along the transverse direction. Due to the merge and combined points main role on the merging process launching and interruption, correlations predicting the merge and combined points positions are provided as a function of the nozzle spacing and the velocity ratio. These correlations are of major importance in the quick estimate of these characteristics points positions which manage two parallel jets flow in various industrial applications.

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Investigation of two plane parallel jets

Cited by 88 publications

References 10 publications

Weakly Interacting Two Parallel Plane Jets

Weakly Interacting Two Parallel Plane Jets

Prediction on Turbulent Flow of Two Parallel Plane Jets Using κ-ε Model

Numerical Study and Correlations Development on Twin-Parallel Jets Flow With Non-Equal Outlet Velocities

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