Abstract
Rapid increase of available computational storage and speed has made possible the direct numerical simulation of the gas-particle jet, of which Reynolds number is about one thousand, based on the Navier-Stokes equation and the Lagrangian equation of particle motion. In this study three-dimensional Eulerian air velocities and Lagrangian particle trajectories are directly simulated to describe the effect of particle existences on the low Re number gas-particle free-jet flow using a two-way method. The results show that the small disturbances due to particle existences in the low Re number gas-particle free jet grow and develop the flow to the turbulence. This is fairly in good agreement with the results obtained by the experimental flow patterns of low Re number free jets and also the calculated flow characteristics of air and particles (mean velocity distributions and fluctuating intensity distributions) are fairly in good agreement with experimental data using laser Doppler anemometry. This means that the existences of particles enhance and develop unstable states in unstable laminar flows like low Re number free jets to turbulence. The turbulence growth mechanism and the effects that the appearance of many small scale eddies due to the particle existence has on the large scales and vice versa have been discussed.
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