Effects of Ambient Pressure on Bubble Characteristics

The effects of the ambient pressure P_ambient on the characteristics of bubble of pulsed discharge in water are investigated. The simulation results show that, when P_ambient increases from 1atm to 100 atm, the bubble radius R decreases from 4 cm to 7 mm, and its pulsation period decreases from 8 ms to 0.2 ms. The results also show that the peak pressure of the first shock wave is independent of P_ambient, but the peak pressure of the second shock wave caused by the bubble reexpansion decreases when P_ambient increases. On the other hand, the larger the ambient pressure, the larger the peak pressure of the plasma in the bubble, while the plasma temperature is independent of P_ambient.