1988 Volume 2 Issue 1 Pages 51-60
To examine the effect of the solid concentration and the particle diameter on the pressure fluctuation in solid-liquid flow, several investigations were made experimentally. The experiment was carried out in a transparent acrylic pipe of 49.7mm i.d., and six kinds of particles are used to investigate the effect of the particle diameter on the pressure fluctuation.
The following results are obtained in this experiment:
1) The maximum pressure fluctuation increases with an increase in the solid concentration increases. The maximum pressure fluctuation also increases as the particle diameter increases, but once it exceeds 2mm, the maximum pressure fluctuations are not affected by the particle diameter and nearly show constant values.
2) In the range of higher velocities, the distributions of the pressure fluctuation are expressed as the Gauss distribution from the results of Probability Density Function, Skewness, and Flatness. In the range of lower velocities, on the other hand, the distributions of the pressure fluctuation are different from the Gauss distribution.
3) In lower velocities and higher concentrations, the obvious periodicities are obtained in the auto-correlation function due to the movement of dune formed in the pipe.