Study on the suppression of bubble behavior by the synergistic effect of vibration and airflow based on pressure and particle collision signals

The influence of operating parameters on different bubble behaviors was studied by peak value measurement method, and the pressure fluctuation signals caused by different bubble behaviors were effectively identified. The experimental results revealed that the slope k ‘of pressure signal accumulation curve caused by small bubbles gradually increases, and the slope k of pressure signal accumulation curve caused by large bubbles decreases first and then increases with the increase of gas velocity. The slope of pressure signal accumulation curve first decreases and then increases as the vibrated frequency was increased. Meanwhile, with the increase of amplitude, the slope of pressure signal accumulation curve caused by small bubbles and large bubbles gradually increases. At the vibration frequency f = 20hz, A = 2 mm, v = 15 cm/s, the vibration energy can effectively decrease the size and number of bubbles, and the effective suppression range of bubble by vibration energy is between 0 and 110 mm. At this time, the standard deviation of the average collision force between particles is the smallest, the bed expansion rate is high, and the fluidization between particles is uniform and stable.