Experimental study of the effect of velocity slip and mass loading on the modification of grid-generated turbulence in gas-solid particles flows.

Experimental data on the effects of the velocity slip and mass loading on a grid-generated turbulence in gas-solid particles flow are presented. Glass beads (700 µm) were used as the dispersed phase. Velocities of both phases were measured with a Laser Doppler Anemometer. Turbulence decay curves, obtained for different grids, show that particles enhance turbulence for small grids and attenuate it for the large ones. Turbulence enhancement and attenuation are intensified with the increase of the flow mass loading. The particles effect on turbulence changes from turbulence attenuation for a small velocity slip to its enhancement for a large velocity slip. A criterion for the evaluation of turbulence modification in gas-solid particles flow is proposed. [ABSTRACT FROM AUTHOR]