Abstract
ABSTRACT Metering of seeds by an air-jet flowing through a conical cavity was investigated. Spherical balls of various diameters were used to represent seeds. Pressure distribution and forces exerted on the ball were measured for different cone configurations, orifice diameters, and cone-ball clearances. Cone angles of 90° developed the highest retaining force. Two mathematical models were derived for the prediction of pressure distribution and forces on the ball. The model derived from stagnation point flow and boundary-layer theory accurately predicted the pressures and forces on the ball for the 1.59 mm orifice over the range of cone-ball clearances yielding high retaining forces. The results of this study are most applicable to the metering of spherical seeds like soybeans.
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