Abstract
In this paper a basic equation for the velocity ratio of particles to fluid was derived on the basis of the observation of solid flow patterns given in a previous report on an established flow at low fluid velocities in horizontal pipes. Measurements of the solid particle velocity for the flow were also conducted by measuring the impulsive force of the solids-fluid two phase flow by the use of a ballistic pendulum. The unknown quantities in the equation were determined by analyzing the experimental data and an empirical equation was obtained. More than 95% of the values calculated by the equation fall within ± 12% of the experimental values.
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