Spark channel propagation in a microbubble liquid
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IED PHYSICS
Spark Channel Propagation in a Microbubble Liquid V. A. Panov, L. M. Vasilyak*, S. P. Vetchinin, V. Ya. Pecherkin, and E. E. Son Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, 125412 Russia *e-mail: vа[email protected] Received December 24, 2015
Abstract—Experimental study on the development of the spark channel from the anode needle under pulsed electrical breakdown of isopropyl alcohol solution in water with air microbubbles has been performed. The presence of the microbubbles increases the velocity of the spark channel propagation and increases the current in the discharge gap circuit. The observed rate of spark channel propagation in microbubble liquid ranges from 4 to 12 m/s, indicating the thermal mechanism of the spark channel development in a microbubble liquid.
DOI: 10.1134/S1063780X16110064
INTRODUCTION Detailed researches of physical processes during testing and ionization of water were promoted by intensive evolution of pulse technics when using distilled water in pulse energy storage units of megavolt range [1] was suggested. The appearance of contemporary nanosecond technics and fast photographic recording allowed us to consider processes occurring in earlier, most high-speed processes of discharge evolution in more detail [2, 3]. Until now, discharge evolution in homogeneous liquids with single impurities of other phases was studied well enough [4]. Presently, researchers study the possibility of effective application of pulse electric discharges in gas-liquid media and in such branches as high-voltage equipment in power engineering [5], decontamination and disinfection of water solutions [6], and purification and chemical decomposition of harmful substances [7]. Despite gathering sound experimental and theoretical materials, there is no physical model of evolution of interelectrode discharge channel in water medium in microsecond and nanosecond time intervals [8, 9], which starts from anode as well as ionization processes in separate bubbles [10, 11]. However, slow thermal generation and evolution stage of spark channel as well as the influence of microbubbles on evolution of channel are almost unstudied. The aim of this work is to study spark discharge at stages of initiation, propagation, and burning of spark discharge in homogeneous liquid and liquid with microbubbles of air on sample of 15% solution of isopropyl alcohol in main water with volume fraction of microbubbles of 3 and 10%.
EXPERIMENTAL Experimental setup consists of discharge highvoltage power source, pulsed voltage generator with shock capacitance of 0.8 μF, controllable discharger, discharge cell, system for registering voltage and current by using Tektronix DPO7054C oscilloscope, and video registering system based on high-speed camera RedLake Motion Pro X3 with the possibility of frame exposition from 1 to 40 000 μs. Signals of current and voltage were registered using noninductive current shunt and voltage divisor. Electric and video signals were synchronized using pulse generator G5-63
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