Abstract
The presence of particles in the fluid flow modulates strongly the conveying phase turbulence, even with very small particle loadings. This work is concerned with the upward, fully developed pipe flow of a gas-particle suspension in which the dispersed phase consists of small (dp/η < 1), heavy particles. The gas flow field was determined with a PDA-installation, and the mixing rate of a passive scalar with a suction probe moving across the pipe diameter. The scalar was fed from modules, producing a concentration profile which can be expressed with a similarity solution. This allowed the effective diffusivity to be determined directly from the measurements. These measurements are compared with a gradient-diffusion model in order to determine the significance of changes in the velocity and length scales for the mixing rate. Results show linear proportionality of the effective diffusivity to particle loading in dilute flows and the significance of change in the length scale of turbulence for the observed mixing rate.
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