PRESSURE

This paper presents the characteristics of the pressure fluctuation in the entrance region in solid-liquid flow. To investigate an axial developing process of the pressure fluctuation, six pressure transducers were set at intervals of 2m in the test pipe. It was found from the experiment that in the range of higher velocities, the maximum pressure fluctuation decreased as the distance from the feeder increased. That is, the maximum pressure fluctuation decreased as the flow developed. On the other hand, in the range of lower velocities, little effect of distance from the feeder on the maximum pressure fluctuation was obtained. Furthermore, it was confirmed that the periodicity in the auto-correlation function was not obtained in the entrance region, but as the flow developed, the obvious periodicity in the auto-correlation function was obtained in the range of lower velocities and higher solid concentration at the measuring point far from the feeder. This periodicity results in the movement of dune formed in the pipe. And it was found that in the entrance region, the maximum pressure fluctuation increased as the particle diameter increased, but the rate of increase of the maximum pressure fluctuation decreased as the distance from the feeder increased. When the flow developed fully, the maximum pressure fluctuation was not effected by the particle diameter. Dunes, Skewness, Flatness, Solid-Liquid

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