A Mathematical Model for Predicting Output Capacity of Selected Stationary Spike-Tooth Grain Threshers

A mathematical expression for predicting the output capacity for threshing process in a throw-in-feed system of a selected spike-tooth stationary grain thresher is presented. The thresher output capacity model was developed by dimensional analysis, using the concept of Buckingham’s Pi Theorem. The model was verified and validated by fitting it into established experimental data from stationary mechanical millet thresher. The result revealed that the fitted model correlated well with the experimental data with R-square value of 0.99. Also, the difference between the means of the predicted and measured output capacities was not statistically significant at a 5% level of significance. The yield factor (Km) obtained with the predicted model was approximately the same with the values obtained from known and measured results.