Numerical simulation of the interactions among multiple turbulent swirling jets mounted in unbalanced positions

Khelil, Ali; Naji, Hassane; Loukarfi, L.; Méliani, M. Hadj; Braikia, Mohamed

doi:10.1016/j.apm.2015.10.047

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…represents higher-order terms in the polynomial. The Richardson extrapolation requires the use of at least three grid-levels (coarse, medium, and fine) [22,23,24], however, it is also possible to use an appropriately chosen number of grid-levels [25,26,27]. The refinement ratio r should be applied in each refinement step.…”

Section: Verification and Validation (Vandv) Assessmentmentioning

confidence: 99%

On the effect of the Froude number on the interface area of gravity-driven liquid rivulets

Sebastia‐Saez

Könözsy

et al. 2018

Chemical Engineering Research and Design

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Section: Verification and Validation (Vandv) Assessmentmentioning

confidence: 99%

On the effect of the Froude number on the interface area of gravity-driven liquid rivulets

Sebastia‐Saez

Könözsy

et al. 2018

Chemical Engineering Research and Design

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“…Khelil et al [21] used the k-ε, RNG k-ε and RSM turbulence models to statistically investigate the interaction between numerous swirling jets deployed in uneven positions. They found that the RSM model was more suitable than the regular k-ε model for capturing mean flow behavior after conducting a numerical examination.…”

Section: Introductionmentioning

confidence: 99%

Thermal and dynamic characterization of a multi-jet system with different geometry diffusers

Zahout,

Braikia,

Khelil

et al. 2024

Journal of Thermal Engineering

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This paper proposed to use the impinging jets mixing process to improve the quality of residential heating and air conditioning. The main objective is to meet the requirements of occupants in terms of thermal comfort and air quality by proposing an optimal solution for the thermal homogenization improvement in the rooms by changing of the diffusers geometry and their arrangement in the ventilation and air-conditioning devices in blowing systems. This study involves both experimental and numerical studies of a three diffusers configurations composed of four peripheral jet with similar geometries and a central jet with a different geometry. All the configurations consist of four equidistant peripheral swirling jets, only the central jet that makes the difference between them. The configuration 1 includes a swirling central jet, on the other hand a circular central jet for the configuration 2 and finally a lobed central jet for configuration 3. The velocity and temperature distributions of the three configurations are investigated experimentally and numerically. Experimentally, the multifunction thermo-anemometer have been used to measure flow temperature and velocity. The dynamic and temperature features are more radially spread and get better homogeneity in configuration 3 and this is due to the energy distribution on the radial plane, which is relatively better than configuration 1 and configuration 2. The second part deals with numerical predictions of the dynamics and thermal fields of the three configurations considered. The study was realized using a RANS-based turbulence model. The numerical results are in reasonable agreement with our experiments for the three configurations. With this study, detailed information on the structure of the resulting flow is very useful to deepen the understanding of the physics of jet interaction and to validate turbulence models. The turbulence simulation is realized by the k-ω-SST model. This model gives a satisfactorily predicts the axial drop in velocity and temperature over the entire study range, demonstrating its ability to handle the interaction between swirling and lobe jets. Our results show that the geometry of the central diffuser is essential. This allows the axial velocity to decrease faster than configurations 1 and 2. This increases lateral diffusion, resulting in better homogenization.

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“…They concluded that it is better to have several jets instead of a single jet having the same momentum flux at the nozzle exit. Khelil et al (2016) have numerically examined the interaction between several swirling jets mounted in unbalanced positions by handling turbulence using the k-ε, RNG k-ε and RSM turbulence models. From the numerical investigation performed, the authors showed that the RSM model was better suited than the standard k-ε model for capturing the mean flow behavior.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of a Turbulent Multiple Jets Issued from Lobed Diffusers

Medaouar¹,

Loukarfi²,

Braikia³

et al. 2019

JAFM

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A combined experimental and computational study of a turbulent multiple jet from lobed diffusers is performed. The main interest of these multiple lobed jets is to come up with the best configuration that improves the thermal and dynamic homogenization in air diffusion units that can be used for ventilation, heating and air conditioning of residential premises. Herein, the configuration of a central lobed jet surrounded by six equidistant peripheral lobed jets has been investigated. On the experimental level, flow velocities and temperatures were measured by a multifunctional thermo-anemometer. In terms of numerical simulation, the conservation equations of mass, momentum and energy are solved while involving four turbulence models, viz., the k-ϵ model, the k-ω, the shear stress transport (SST) k-ω model and the Reynolds Stress Model (RSM). The findings are compared with thermo-anemometer measurements. It turns out that the SST k-ω model is most appropriate for predicting the average flow characteristics.

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Numerical simulation of the interactions among multiple turbulent swirling jets mounted in unbalanced positions

Cited by 8 publications

References 35 publications

On the effect of the Froude number on the interface area of gravity-driven liquid rivulets

On the effect of the Froude number on the interface area of gravity-driven liquid rivulets

Thermal and dynamic characterization of a multi-jet system with different geometry diffusers

Experimental and Numerical Study of a Turbulent Multiple Jets Issued from Lobed Diffusers

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