Pre-breakdown processes in a dielectric fluid in inhomogeneous pulsed electric fields
Pre-breakdown processes in a dielectric fluid in inhomogeneous pulsed electric fields
复制标题
非均匀脉冲电场中介电流体的预击穿过程
DOI：
10.1063/1.4922244
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发表时间：
2014
影响因子：
3.2
通讯作者：
M. Pekker
中科院分区：
文献类型：
--
作者：
M. Shneider;M. Pekker
我们认为，在非均匀脉冲电场的电致伸缩应力的影响下，在介电流体中出现的预击穿空化纳米孔的发展。结果表明，三个特征区域可以区分附近的针电极。在电场梯度最大的第一区域中，在电压纳秒脉冲期间发生的空化纳米孔可以生长到这样的尺寸，在该尺寸下，由孔内的场加速的电子可以获得足够的能量用于相对孔壁上的液体的激发和电离，即，满足击穿条件。在第二区域中，由电致伸缩引起的负压足够大以用于空化起始（其可以通过光学方法记录），但是，在电压脉冲期间，孔没有达到跨越其边界的电势差变得足以用于水分子的电离或激发的尺寸。在...
We consider the development of pre-breakdown cavitation nanopores appearing in the dielectric fluid under the influence of the electrostrictive stresses in the inhomogeneous pulsed electric field. It is shown that three characteristic regions can be distinguished near the needle electrode. In the first region, where the electric field gradient is greatest, the cavitation nanopores, occurring during the voltage nanosecond pulse, may grow to the size at which an electron accelerated by the field inside the pores can acquire enough energy for excitation and ionization of the liquid on the opposite pore wall, i.e., the breakdown conditions are satisfied. In the second region, the negative pressure caused by the electrostriction is large enough for the cavitation initiation (which can be registered by optical methods), but, during the voltage pulse, the pores do not reach the size at which the potential difference across their borders becomes sufficient for ionization or excitation of water molecules. And, in ...