Effect of the coflow stream on a plane wall jet

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

doi:10.1007/s00231-014-1372-7

Cited by 10 publications

(1 citation statement)

References 26 publications

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“…They reported that the development of the flow strongly depends on the offset ratio. The effect of co-flow on the dynamic and thermal characteristics have been studied by Ayech et al 33 They shown that the inertial and buoyancy forces influence the buoyant wall jet. They also noticed that the potential core increases with the velocity ratio.…”

Section: Introductionmentioning

confidence: 99%

Effect of initial conditions on mean flow characteristics of a three dimensional turbulent wall jet

Kumar

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The effect of initial conditions in a [Formula: see text] sidewall enclosure on the mean flow characteristics of a three dimensional turbulent square wall jet has been studied experimentally. The initial conditions are varied by varying the length of the nozzle; it is varied as l/ h = 10, 50, and 90, where l and h indicates the nozzle length and the side of the square nozzle, respectively. The effect of nozzle length on initial velocity profiles, velocity distribution in lateral and wall normal directions, spread rate, decay of maximum mean velocity, local Reynolds number and similarity behaviour has been studied. The wall normal spread width is higher for the nozzle length l/h = 10 in the near field [Formula: see text] but this trend completely changed after [Formula: see text]. The spread rate is found independent of the initial condition of the nozzles in the fully developed region. The decay rate of maximum mean velocity is found higher for l/ h = 10 in the region of ([Formula: see text], whereas decay rate becomes independent of the initial conditions in the fully developed region [Formula: see text]. The local Reynolds number variation is also estimated along the downstream directions for present case and found that the local Reynolds number [Formula: see text] reaches approximately 56% of the jet exit Reynolds number [Formula: see text] at [Formula: see text] for nozzle length l/ h = 10, while it is 57% and 59% of Rejet for the nozzles [Formula: see text] and [Formula: see text] respectively at the same location. The nozzle l/ h = 10 attained self similar behaviour more quickly as compared to the other nozzles. The sidewall played a significant role which pushed the fluid more towards the center resulting in a lower jet half width in the wall normal direction as compared to the corresponding case, without a sidewall. The decay rates of the maximum mean velocity for all the nozzles are estimated to be 1.08 which is in the accepted range found in the literature.

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Section: Introductionmentioning

confidence: 99%

Effect of initial conditions on mean flow characteristics of a three dimensional turbulent wall jet

Kumar

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Effect of Froude Number on the Turbulent Wall Jet in Coflow Stream

Ayech

Habli

Saïd

et al. 2015

Design and Modeling of Mechanical Systems - II

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Sixth Conference on Design and Modeling of Mechanical Systems (CMSM 2015), Hammamet, TUNISIA, MAR 23-25, 2015International audienceThe influence of the coflow velocity ratio on the behavior of a non isothermal turbulent wall jet has been determined numerically. The numerical resolution of the governing equations is carried out using a finite difference method. Turbulence modeling is performed by a modified low-Reynolds number k-epsilon model. In this work, we are interested in the study of the effect of the coflow stream on the behavior of the dynamic and thermal properties of the wall jet subjected to a constant temperature. A comparison with a simple wall jet is carried out. Further, we will examine the influence of the Froude number on the wall jet emerging in a coflow stream

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