Comparative study of flow characteristics of a single offset jet and a turbulent dual jet

Assoudi, Ali; Saïd, Nejla Mahjoub; Bournot, Hervé; Palec, Georges Le

doi:10.1007/s00231-018-2493-1

Cited by 26 publications

(5 citation statements)

References 32 publications

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“…This method allows the discretization of these equations using the first-order upwind scheme [28]. The SIMPLE algorithm [29] is applied for the pressurevelocity coupling. The equations are solved iteratively using the Tri-Diagonal-Matrix-Algorithm (TDMA).…”

Section: Methodsmentioning

confidence: 99%

Characteristics and analysis of a turbulent offset jet including the effect of density and offset height

Assoudi

Amamou

Saïd

et al. 2020

International Journal of Mechanical Sciences

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Section: Methodsmentioning

confidence: 99%

Characteristics and analysis of a turbulent offset jet including the effect of density and offset height

Assoudi

Amamou

Saïd

et al. 2020

International Journal of Mechanical Sciences

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“…They concluded that the convective heat transfer was intensified when the OR decreased and the Reynolds number increased. Later on, Assoudi et al 17 studied the heat-transfer characteristics of the dual jet using the Reynolds stress and the standard k –ε turbulence models. When comparing the results with the experimental data of Wang and Tan, 12 the Reynolds stress model performed better than the standard k –ε model.…”

Section: Introductionmentioning

confidence: 99%

CFD Investigation of Thermal Characteristics for a Dual Jet with a Parallel Co-flow

et al. 2022

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A combined turbulent wall jet and offset jet (also known as the dual jet) with and without the presence of a parallel co-flow stream is studied. The standard k –ω turbulence model is used to predict the turbulent flow. The study focuses on the effects of the co-flow velocity (CFV) on the heat-transfer characteristics of the dual jet flow with the bottom wall maintained at a constant wall temperature. The CFV is varied up to 40% of the jet inlet velocity, and the height of the offset jet is varied from 5 to 11 times the jet width with the inlet Reynolds number taken as 15,000. The heat-transfer results reveal that the local Nusselt number ( Nu x ) along the bottom wall exhibits a peak at the immediate downstream of the nozzle exit, followed by a continuous decay in the rest of the converging region before showing a small rise for a short streamwise distance in the merging region. Further downstream, in the combined region, Nu x gradually decreases with the downstream distance. Except the merging region, no influence of co-flow is observed in the other two flow zones (converging and combined regions). In the merging region, for a given offset ratio (OR), Nu x remains nearly constant for a certain axial distance, and it decreases as the CFV increases. As a result of the increase in the CFV, the average Nusselt number decreases, indicating a reduction in overall convective heat transfer for higher values of the CFV. A regression analysis among the average Nusselt number ( ), CFV, and OR results in a correlation function in the form of within the range OR = 5–11 and CFV = 0–40%.

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“…They further concluded that square jet is advantageous over the circular jet for jet characteristics. Assoudi et al 32 made a comparison between an offset jet and a dual jet (a combination of a wall jet and an offset jet) at different offset ratios, jet exit velocity and jet exit temperature. They reported that the development of the flow strongly depends on the offset 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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Comparative study of flow characteristics of a single offset jet and a turbulent dual jet

Cited by 26 publications

References 32 publications

Characteristics and analysis of a turbulent offset jet including the effect of density and offset height

Characteristics and analysis of a turbulent offset jet including the effect of density and offset height

CFD Investigation of Thermal Characteristics for a Dual Jet with a Parallel Co-flow

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

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