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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Nonlinear oscillations of gas bubbles submerged in water: Implications for plasma breakdown
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Nonlinear oscillations of gas bubbles submerged in water: Implications for plasma breakdown

机译：浸入水中的气泡的非线性振荡：对等离子体破裂的影响

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Gas bubbles submerged in a dielectric liquid and driven by an electric field can undergo dramatic changes in both shape and volume. In certain cases, this deformation can enhance the distribution of the applied field inside the bubble as well as decrease the internal gas pressure. Both effects will tend to facilitate plasma formation in the gas volume. A practical realization of these two effects could have a broad impact on the viability of liquid plasma technologies, which tend to suffer from high voltage requirements. In this experiment, bubbles of diameter 0.4-0.7mm are suspended in the node of a 26.4kHz underwater acoustic standing wave and excited into nonlinear shape oscillations using ac electric fields with amplitudes of 5-15kVcm ~(-1). Oscillations of the deformed bubble are photographed with a high-speed camera operating at 5130framess ~(-1) and the resulting images are decomposed into their axisymmetric spherical harmonic modes, Y ~0 _l, using an edge detection algorithm. Overall, the bubble motion is dominated by the first three even modes l=0, 2 and 4. Electrostatic simulations of the deformed bubble's internal electric field indicate that the applied field is enhanced by as much as a factor of 2.3 above the nominal applied field. Further simulation of both the pure l=2 and l=4 modes predicts that with additional deformation, the field enhancement factors could reach as much as 10-50.
机译：浸入介电液体中并受到电场驱动的气泡在形状和体积上都可能发生剧烈变化。在某些情况下，这种变形可以增强气泡内部施加场的分布，并降低内部气压。两种作用都倾向于促进气体体积中的等离子体形成。实际实现这两种效果可能会对液体等离子技术的生存能力产生广泛的影响，而这种技术往往会遭受高压要求。在此实验中，直径为0.4-0.7mm的气泡被悬浮在26.4kHz的水下声驻波的节点中，并使用振幅为5-15kVcm〜（-1）的交流电场被激发为非线性形状振荡。用高速相机以5130frames〜（-1）拍摄变形气泡的振动，并使用边缘检测算法将所得图像分解为轴对称球谐模Y〜0 _1。总的来说，气泡运动主要受前三个偶数模式l = 0、2和4的控制。变形气泡内部电场的静电模拟表明，施加的电场比标称施加的电场提高了2.3倍。 。对纯l = 2模式和l = 4模式的进一步仿真预测，随着额外的变形，场增强因子可能会达到10-50。

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