Electric discharge initiation in water with gas bubbles: A time scale approach
Electric discharge initiation in water with gas bubbles: A time scale approach
复制标题
DOI：
10.1116/6.0001990
复制
发表时间：
2022-12
期刊：
影响因子：
--
通讯作者：
N. Sponsel;S. Gershman;M. H. Herrera Quesada;J. T. Mast;K. Stapelmann
中科院分区：
文献类型：
--
作者：
N. Sponsel;S. Gershman;M. H. Herrera Quesada;J. T. Mast;K. Stapelmann
实验研究了高压纳秒脉冲驱动下的去离子水中氩气气泡放电。使用两种电极配置在时间上解析从施加的电压上升时间（7 ns）到第一个脉冲结束（[公式：见正文]30 ns）和更长时间（>50 ns）的放电时间尺度。我们发现，在正和负施加电压极性，放电开始在水中的阳极尖端。水中的放电迅速延伸（[公式：见正文] m/s）到气泡的顶点，从气泡内部发出的光开始形成。所施加电压的陡升率（[公式：见正文] kV/ns）和水中放电发展的短时间表明，空化是水中放电启动和传播的可能机制。此外，所施加的电压脉冲的短持续时间导致气泡内部仅部分汤森放电。
High voltage nanosecond pulse driven electric discharges in de-ionized water with an argon bubble suspended between two electrodes were experimentally investigated. Two electrode configurations were used to temporally resolve the time scales of the discharge from the applied voltage rise time (7 ns), through the end of the first pulse ([Formula: see text]30 ns), and longer (>50 ns). We found that, in positive and negative applied voltage polarities, discharge initiates in the water at the tip of the anode. The discharge in the water rapidly extends ([Formula: see text] m/s) to the apex of the bubble and light emitted from inside the bubble begins to form. The steep rate of rise of the applied voltage ([Formula: see text] kV/ns) and the short time for the development of discharge in the water suggest that cavitation is a likely mechanism for discharge initiation and propagation in water. In addition, the short duration of the applied voltage pulse results in only a partial Townsend discharge inside the bubble.