Early stage of pulsed discharge in water

The bubble radius at the early stage of discharge in water is investigated using high-speed photography. Some simulation results on the bubble radius are presented, which are in agreement with the experimental results, with a maximum difference of about 10%. The reasons why the peak pressure of the first shock wave is only related to the energy released in the bubble durin g the first half period are addressed. The energy released in the bubble af ter the first half period increases the bubble pulsation period, but it pro duces no more than 10% under the peak pressure of the second shock wave.