The particle dispersion characteristics of the dense gas-solids two-phase coaxial jets were investigated with high-speed camera.The results showed that with increasing gas velocity,three particle dispersion modes were...The particle dispersion characteristics of the dense gas-solids two-phase coaxial jets were investigated with high-speed camera.The results showed that with increasing gas velocity,three particle dispersion modes were observed:shear dispersion,wave dispersion and oscillating dispersion,after the particle flow passed through the intact length.The normalized intact length decreased with increasing gas velocity.For the wave dispersion,the unstable wavelength increased linearly with axial distance at different gas velocities.For the oscillating dispersion,oscillating frequency decreased at first and then increased with increasing gas velocity,so the oscillating frequency had a minimum when the gas velocity was about 65 m·s-1.展开更多
To provide reference for engineering application and validation of numerical simulations PIV experimental technology was used to visualize a gas-solid two-phase turbulent round jet.The Reynolds number of the flow Re=6...To provide reference for engineering application and validation of numerical simulations PIV experimental technology was used to visualize a gas-solid two-phase turbulent round jet.The Reynolds number of the flow Re=6200 and the Stokes numbers of particles were 1.2,9.2 and 25.7,respectively.It was shown that the coherent structures was transformed from large-scale to small-scale and from two-dimensional to three-dimensional.The preferential concentration effect was observed for particles at the Stokes number of 1.2.With the increase of the Stokes number or the mass loading,the particles were less influenced by coherent structure.展开更多
文摘The particle dispersion characteristics of the dense gas-solids two-phase coaxial jets were investigated with high-speed camera.The results showed that with increasing gas velocity,three particle dispersion modes were observed:shear dispersion,wave dispersion and oscillating dispersion,after the particle flow passed through the intact length.The normalized intact length decreased with increasing gas velocity.For the wave dispersion,the unstable wavelength increased linearly with axial distance at different gas velocities.For the oscillating dispersion,oscillating frequency decreased at first and then increased with increasing gas velocity,so the oscillating frequency had a minimum when the gas velocity was about 65 m·s-1.
文摘To provide reference for engineering application and validation of numerical simulations PIV experimental technology was used to visualize a gas-solid two-phase turbulent round jet.The Reynolds number of the flow Re=6200 and the Stokes numbers of particles were 1.2,9.2 and 25.7,respectively.It was shown that the coherent structures was transformed from large-scale to small-scale and from two-dimensional to three-dimensional.The preferential concentration effect was observed for particles at the Stokes number of 1.2.With the increase of the Stokes number or the mass loading,the particles were less influenced by coherent structure.
