Abstract
The authors have introduced a new formula for the motion of granular solids supplied in an air flow through a pipe and further shown a formula for the pressure drop of the flow at a constant velocity through a pipe due to acceleration and the conveyance of solids. In order to prove the applicability of these formulas to practical use, experiments were repeated under various conditions conveying wheat and alumina through straight pipes placed in the horizontal or vertical plane. Moreover the flow of solid in transparent pipes has been observed. The experiments and observations are effective in deciding the velocity and pressure of air required for the conveyance of solids through a pipe.
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