Particle-turbulence interactions in the turbulent boundary layer for cross flow over a tube

Abstract The turbulent fluid and particle interaction in the turbulent boundary layer for cross flow over a tube was studied experimentally. A phase Doppler anemometer (PDA) was used to measure the mean and fluctuation velocities of both phases. Two size ranges of particles (30–60 μm and 80–150 μm) at certain concentrations were used to investigate the effect of the particle size on the mean velocity profiles and turbulent intensity levels. The measurements clearly demonstrated that the larger particles damped the fluid turbulence. For the smaller particles, this damping effect was less noticeable. The measurement further showed a delay in the separation point for two-phase turbulent cross flow over a tube.