Abstract
In order to investigate the generation and propagation of pressure wave by spark discharge in liquid systematically, the voltage across the electrode gap and the discharge current are measured with an accuracy required in the above-mentioned analysis as the first step. Using the results, the resistance of the electrode gap and the electrical energy supplied to spark channel are discussed. The kinds of liquid used in the experiment are tap water, O. 1% and 1. 0% NaCl solutions. The results obtained are as follows : (1) Regardless of the kinds of liquid used, the resistance of the electrode gap decreases abruptly from the intrinsic resistance of the liquid to O.1-0.3 ohms after the breakdown of the liquid. After that, it varies with the cyclic variation of the discharge current. Also it has a tendency to increase with an increase of the electrode gap distance in all kinds of liquids.(2) Regardless of the kinds of liquid used, as the first minimum value increases in the cyclic variation of the resistance after the breakdown of the liquid, the electrical energy of a first-wave in the electric power wave becomes larger and the electrical energy supplied to spark channel is centered at the first-wave in the electric power wave.
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