音波照射による液体中での閉端孔内気体振動およびその排出現象

抄録

In manufacturing processes using liquids, such as cleaning, painting, and gluing require to fill the inside of the pores on the product surface with liquid. However, the surface tension prevents interface deformation and causes difficulty filling the liquid for small pores closed at one end. In this study, we observed the gas discharging process from the pores by irradiating acoustic waves. First, we found a correlation between the amplitude of the interfacial oscillation and the gas discharging, suggesting the importance of the volume oscillation of the gas column. The three important factors for gas discharging were the bubble and droplet generation from the gas-liquid interface and liquid film formation along the wall. Besides, these phenomena easily occurred in the ethanol, where the surface tension was small. Finally, we found enhancement of the coalescence and ejection of the bubble by irradiating the natural frequency of the bubble when a breakup bubble remained in the pore.