Mechanism of pulsed airflow-flexible porous coupling bubble formation
Flexible-hole aeration is widely used in the aerobic process of sewage treatment to control the amount of dissolved oxygen in the water body.Reducing the size of microbubbles can help improving the oxygen utilization rate and microbial activity of the water body,and enhancing the efficiency of the aerobic process.Converting continuous gas supply to pulsed gas supply can significantly reduce the bubble size.However,the bubble formation mechanism of flexible-holes under pulsed flow regime is still unclear.This paper takes the pulsed air flow-flexible hole coupled bubble formation as the research object.Through a combination of mechanical analysis and optical observation,the impact of pulsed air flow on the flexible-hole bubble formation process was analyzed.The research results show that the pulse air flow strengthens the momentum force of bubble desorption,and at the same time triggers high-frequency and low-amplitude oscillations of the flexible membrane,which promotes early desorption of bubbles.Besides,pulsed air flow inhibited the vertical coalescence of bubbles,which together led to the reduction of bubble size.
万方数据
维普
