Chemical Engineering Research & Design, Vol.79, No.5, 515-522, 2001
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 simulated using the incompressible Navier-Stokes equations with mass transfer and the standard k -epsilon turbulence model. The mixing effectiveness is characterized by evaluation of the second moment of mixing at various downstream locations. The numerical results for single and double jets agree well with both existing experimental data as well as semi-empirical expressions. Using the simulated data, a new correlation is developed to predict the mixing performance of both single and multiple jet configurations. The numerical results suggest that multiple jets ensure better mixing in addition to decreasing power requirements with an increasing number of jets. In particular, the case of four jets ( = 4) provides distinctly superior mixing compared to n < 4.