抄録
The motion of small particles in a turbulent jet is visualized by calculating the trajectories of particles in an instantaneous flow field simulated using an axisymmetric discrete vortex method. The jet is issued into the ambient air with the velocity of 37.5m/s from a convergent nozzle with a exit diameter of 20mm. The instantaneous distributions of particle are calculated for three different size of DOP particle of 1μm, 10μm and 100μm in diameter, which fidelity to the flow is good, medium and very poor in order.
The results of particle dispersion calculation show that the motion of all the size of particles calculated is controlled strongly by large scale vortex structure of the jet. The interesting phenomena that the relatively large particles disperse to far out of the jet and that the dispersion of particles is enhanced abruptly at a certain location of the downstream in the jet are attributed to the large scale vortex structure of the jet.
