Numerical study of multi-jet mixing

The mixing process of turbulent streams within a pipeline due to single and multiple transverse jets is analyzed in this paper. The process is simulat ed using the incompressible Navier-Stokes equations with mass transfer and the standard k - epsilon turbulence model. The mixing effectiveness is char acterized by evaluation of the second moment of mixing at various downstrea m locations. The numerical results for single and double jets agree well wi th both existing experimental data as well as semi-empirical expressions. U sing the simulated data, a new correlation is developed to predict the mixi ng performance of both single and multiple jet configurations. The numerica l results suggest that multiple jets ensure better mixing in addition to de creasing power requirements with an increasing number of jets. In particula r, the case of four jets ( = 4) provides distinctly superior mixing compare d to n < 4.