A numerical investigation of multiple lobed jets was performed using the standard k - ε turbulence model. The present work laid emphasis on understanding the mechanism of mixing enhancement by multiple lobed jets. Further studies were carried out to compare mixing performance of multiple lobed jets with that of multiple conventional round jets for the same amount of momentum flux provided at the nozzle inlet. The numerical predictions matched reasonably well with the experimental data. The centreline velocity decay rate was fastest in the case of multiple lobed jets. The strongest streamwise vortices were generated in the case of multiple lobed jets. A passive scalar (temperature) was used for the quantification of mixing to figure out the jet configuration that provides the best mixing. In the near field of the jet, multiple lobed jets performed the best mixing by early introduction of strong streamwise vortices; while in the far field of the jet, both jet configurations behaved in a similar way.
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