| Abstract: | Stimulus response experiments are conducted in four different rectangular columns having two and three spout cells. A pink‐coloured polymer material is used as bed material with ambient air as the spouting fluid. A pulse input of dark blue colour polymer material is used as the stimulus, when the column is operating under steady flow conditions, and the response measured. A mathematical model “plug flow‐mixed flow in series” is used to fit the experimental data and the model parameters are evaluated. |
