Abstract
An investigation of the flow of granular materials from pyramidal hoppers under the influence of gravity has been carried out and the influence of the hopper angle, outlet area and its shape on the flow rate has been studied.Consequently, it was found that the flow rate measured was proportional to 1.33 power of the effective discharge area, and the influence of hopper angles was different for each material. But, it is generally able to be expressed that the flow rate is proportional to (tanθ/2)-n. For spherical materials n=0.33. For irregular shape materials n=0.33 or 0.50, but there exists a critical hopper angle. For hopper angles greater than the critical hopper angle, the flow rate is independent of hopper angles. The critical hopper angle of granular materials is approximately correlated with its surface kinetic angle.It was found that the discharge coefficient of pyramidal hoppers with the square discharge outlet was approximately correlated with the surface kinetic angle of granular materials, more exactly it was considered that the discharge coefficient was determined with a particle size and shape.Also, it was found that the discharge coefficient of pyramidal hoppers with the rectangular discharge outlet was smaller than that of the square, and correlated with the effective hydrolic diameter ratio.
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