A numerical study of a plane turbulent wall jet in a coflow stream

Ayech, Syrine Ben Haj; Habli, Sabra; Saïd, Nejla Mahjoub; Bournot, Philippe; Palec, Georges Le

doi:10.1016/j.jher.2016.02.001

Cited by 11 publications

(2 citation statements)

References 31 publications

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“…This is because the strongly advected side of the jet (the upper side) has difficulty in entraining the free stream fluid into the jet, as the jet momentum at this side of the jet is relatively small compared to the momentum of the free stream, and vice versa for the weakly advected side of the jet (the lower side) [32]. This is consistent with reported studies on jet interaction in a co-flowing free stream, such as the studies of Ben Haj Ayech et al [33] and Kalifa et al [34]. It is also important to note that the jet causes a reduction in the streamwise velocity near the cavity trailing edge (region "C"), as demonstrated in Figure 9d.…”

Section: Jet Impact On the Cavity Separated Shear Layersupporting

confidence: 88%

The Impact of Steady Blowing from the Leading Edge of an Open Cavity Flow

2021

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Cavity flows occur in a wide range of low-speed applications (Mach number ≤0.3), such as aircraft wheel wells, ground transportation, and pipelines. In the current study, a steady jet is forced from a cavity leading edge at different momentum fluxes (0.11 kg/ms2, 0.44 kg/m·s2, and 0.96 kg/m·s2). The investigation was performed for an open cavity with length to depth ratio of 4 at the Reynolds number based on a cavity depth of approximately 50,000. Particle image velocimetry, surface oil flow visualisation, constant temperature anemometry, and pressure measurements were performed in this investigation. The aim of the jet blowing is to separate the cavity separated shear layer from the recirculation zone to reduce the cavity return flow, and hence stabilise the cavity separated shear layer. It was found that increasing the jet momentum flux causes an increase in the cavity return flow due to the increase in the thickness of the cavity separated shear layer. The study also found that the jet populates the separated shear layer with a large number of small-scale disturbances. These disturbances increase the broad band level of the pressure power spectra and Reynolds shear stress in the cavity separated shear layer. On the other hand, the jet disturbances make the shedding of the large vortical structures more intermittent.

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Section: Jet Impact On the Cavity Separated Shear Layersupporting

confidence: 88%

The Impact of Steady Blowing from the Leading Edge of an Open Cavity Flow

2021

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“…Amitesh [20] identified and expressed the location of reattachment point and vortex centre of an offset jet and merge point, combined point, and the vortex centers of a dual jet. In the same context, other researchers are interested by the field of the flow behavior of wall jet using several models, among of them, Ahlman et al [21], Iftekhar et al [22] and Ayech et al [23].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Orifice Shape Effect on the Flow Behavior of the Jet-Cavity Interaction

Boualem

2021

DDF

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The aim of the present work is to analyze the effect of orifice shape on wall jet development to enhance the impingement heat transfer in confined cavity with the validated model of hot and cold jet using computing code ANSYS.CFX. Circular, elliptic, square and rectangular are the investigated orifice shapes, that they have the same hydraulic diameter Dh = 0.12m. Another objective of this paper is to investigate the influence of Reynolds number based on the mean jet splay and diffuser hydraulic diameter. The validation of results shows qualitatively good agreement and almost all flow structures are well reproduced by the computation. The results show that the orifice shape affects the flow and the heat transfer coefficient in the cavity. The elliptical shape gives an accelerated flow, which provides better heat transfer enhancement of 7% than that the circular diffuser.

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