Establishing the conveying parameters required for the air-seeders

(a) Maximum flow concentration of wheat. Each point is the average of 5 measurements; (diamonds) 20 mm diameter pipe horizontal, (saltire) 20 mm diameter pipe vertical, (squares) 25 mm diameter pipe horizontal, (six spoked asterisk) 25 mm diameter pipe vertical, (triangle) 30 mm diameter pipe horizontal, (bullet) 30 mm diameter pipe vertical. (b) Influence of the pipe diameter and the material flowrate on the pressure drops, at the constant air velocity of 16 m s−1. Each point is the average of 5 measurements; (diamonds) 30 g s−1 material flowrate, (squares) 25 g s−1 material flowrate, (triangle) 5 g s−1 material flowrate, (saltire) air only. (c) Influence of the pipe diameter and the material flowrate on the power consumption, at the constant air velocity of 16 m s−1. Each point is the average of 5 measurements; (diamonds) 30 g s−1 material flowrate, (squares) 25 g s−1 material flowrate, (triangle) 5 g s−1 material flowrate, (saltire) air only.131