音波照射による閉端孔からの気体排出過程の観察

抄録

We attempted perfect gas discharging from closed end holes in liquid due to acoustic wave irradiation. An underwater speaker was set in front of test samples in liquid pool and pressure waves of sinusoidal wave, which have constant frequency or whose frequency changes in time, i.e. sweep wave, were irradiated. We observed the gas discharging process with a high-speed video camera during acoustic wave irradiation to investigate the factors that promoted gas discharging. As a result, we found that the sweep wave irradiation was more effective for gas discharging than that of constant frequency and the sweep wave was able to achieve complete gas discharging with several seconds. In addition, we found that the discharging process consists of three stages. The detail of the three steps are discussed.