Discharge propagation in water in non-uniform field

Abstract

The optic observation results of the impulse discharge propagation in the deionized water 2-8 cm gaps formed by point and plane electrodes are described. The formation of weekly conducting and weekly luminous but scattering laser beam matter at the point always preceded the positive discharge channels development. The matter nature isn't identified. Continuos and discrete forms of the discharge channels propagation and transition from one to another are founded. Flashes of the discrete propagating main channels were stipulated by the thin lower conductivity channels growth, which form a bush(brush)-like structure. The diameters

Streamers in water and other dielectric liquids

“…The streamer propagation pattern matched prior observations for the respective polarities. Propagation velocities from the cathode were measured in the 0.4-0.5 km s −1 range, while they grew forward from a bubble on the anode at about 2 km s −1 , in agreement with measurements conducted in previous studies [62,63,69,70]. Korobeynikov et al conclude that breakdown in liquids is, in general, initiated from possibly microscopically small preexisting gas bubbles or pockets on the electrode surface.…”

“…In comparison, a cathodeinitiated breakdown shows much stronger light emission at the front of the out-fanning streamers as compared with the length of the trailing channel. Most observations of large gaps under the application of impulse voltages with durations on the order of 1µs or longer describe similar features for the appearance of the discharge in water [61][62][63][64]. Non-luminous streamers, typical of breakdown originating from the cathode, were also observed for the application of rectangular short voltage pulses of 200 ns in sub-millimetre gaps (figure 6(a)).…”

Pulsed Electrical Technologies Assisted Polyphenols Extraction from Agricultural Plants and Bioresources: A Review

“…Others reject the thesis that an electronic avalanche could be developed in water [20]. The work of Gavrilov et al (1994), Kukhta et al (1996), and Kukhta al. (1999) [26][27][28] highlight supersonic leaders (presence of thermalization) whose development is accompanied by a pressure wave.…”