Effects of Constructional and Operational Variables on the Mean Mass Flow of Particulate Fertilizer Using a Studded Roller Feeder

Abstract

The influence of operational variables, defined as variables that may change during field work, and constructional variables, defined as variables set when assembling the spreader, on the mean mass flow was measured and empirical models fitted to measured data. The operational variables investigated were angular velocity of roller, base flap setting, inclination of feeder and particle size distribution. Only one construction variable, stud height, was investigated. The stud height was the single factor with the greatest influence on mass flow. Change in stud height changes both the general level of the mass flow as well as the response to changes in angular velocity. Mass flow changes due to changes in angular velocity were extensive and followed a linear relationship. The influence of base flap setting was limited. Inclination of the feeder was found to affect the mass flow and the work gives rise to suspicions that the base flap may be responsible for mass flow changes when the feeder is inclined. The influence of moderate changes in particle size distribution, and thereby internal friction of the material was found to be very limited.