THE USE OF THE KINEMATIC MODEL TO PREDICT THE DEVELOPMENT OF THE STAGNANT ZONE BOUNDARY IN THE BATCH DISCHARGE OF A BUNKER

The kinematic model for predicting the velocity distribution in a flow ing granular material has fallen out of favour, partly because of its inability to predict the existence of stagnant zones. A modification o f the model, making allowance for the dilation that occurs on initiati on motion, is proposed. The modified model is used to predict the chan ging shape of the flowing zone in the batch discharge of a cylindrical bunker. The predictions are in excellent agreement with Watson's expe rimental measurements.