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首页> 外文会议>IEEE International Conference on Plasma Sciences >Volume mode excitation in submerged bubbles: Towards reducing breakdown voltage for plasma generation in liquids
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Volume mode excitation in submerged bubbles: Towards reducing breakdown voltage for plasma generation in liquids

机译：浸没气泡中的体积模式激发：降低液体中产生等离子体的击穿电压

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摘要

Plasma ignition of submerged gas bubbles reduces the breakdown voltage required to introduce plasma into a liquid. It is possible to further reduce the breakdown voltage of bubbles in liquid water. Local enhancement of the electric field through bubble shape mode activation combined with volume modulation for decreased internal pressure and neutral density is a potential pathway for minimizing breakdown voltage. Although electrohydraulic control of bubble shape has been investigated[1], for the purpose of reducing breakdown voltage, the quantitative benefits of accessing bubble volume modes remain unexplored. Submerged bubble volume modulation may be achieved by sonically or electrohydraulically driving a time-varying sinusoidal field at the Minnaert resonance frequency. Volume mode activation as a possible pathway to reduced breakdown voltage is demonstrated using Rayleigh-Plesset modeling of the transient bubble radius under an applied sinusoidal pressure signal. Results from an experimental investigation aimed at exciting volume modes are also presented. Additionally, results from preliminary experiments aimed at breaking down a volume mode oscillating bubble as a function of internal bubble pressure is presented. Here, a fast, low-light level photodiode is used to indicate breakdown.
机译：浸没气泡的等离子点火降低了将等离子引入液体所需的击穿电压。可以进一步降低液态水中气泡的击穿电压。通过气泡形状模式激活与体积调制相结合来局部增强电场，以降低内部压力和中性密度，这是使击穿电压最小化的潜在途径。尽管已经研究了对气泡形状的电液控制[1]，但是为了降低击穿电压，访问气泡体积模式的量化优势仍未得到开发。可以通过以Minnaert共振频率声波或电液驱动时变正弦场来实现淹没气泡的体积调制。使用正弦压力信号下瞬态气泡半径的瑞利-普莱塞（Rayleigh-Plesset）建模，证明了体积模式激活是降低击穿电压的可能途径。还介绍了针对激动人心的音量模式的实验研究结果。此外，还提供了一些初步实验的结果，这些实验的目的是根据内部气泡压力分解体积模式的振荡气泡。在这里，使用快速，低亮度的光电二极管来指示击穿。

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