Turbulent Characteristics of a Novel Circulating Jet Mixer
YU Yan-fang WU Jian-hua MENG Hui-bo
College of Mechanical Engineering, Shenyang University of Chemical Technology College of Mechanical Engineering, Shenyang Institute of Chemical Technology College of Mechanical Engineering, Shenyang University of Chemical Technology
Abstract：SST k-w turbulence model was employed to simulate the turbulent flow field of a novel circulating jet mixer. The similarity of confined zone jet and the decay of jet axial velocity at various baffle lengths were carried out. The decay of dimensionless jet axial velocity by simulation was in good accordance with theoretical curve for free turbulent jet. The fluid zone in the jet mixer was divided into four sub-regions based on the three-dimension velocities. The fluid circulating flow in the novel jet mixer was studied by vorticity and the average vorticity áw? with different axial positions and phase planes. The results show that the maximum value of áw? is 11.22 at z/H=0.25. áw? is positive at qp<20o, while at other qp it is negative. The maximum value of áw? is 27.22 which is located at qp=16o, and the minimum value of áw? is -100.66 at qp=20o. The simulation result of shear rate reveals that the larger value is located in the trailing vortex. The factors for enhancing the mixing effect are put forward.
2011, Vol. 11 
