Abstract
Bubble pulsation is known to occur as a result of high-voltage discharge in water. Due to advantages such as long duration and significant bubble pulsation production, this technique is widely used in industrial production. Bubble pulsation is directly reflected by the pulsation efficiency, which is mainly embodied in the transformation efficiency from the high-voltage discharge energy to the bubble expansion energy, as well as the residual rate of bubble pulsation energy. In this study, high-voltage discharge was used in water to form pulsating bubbles. The vertical displacement of water was restricted by the experimental equipment, so horizontal displacement was mainly generated. Therefore, any influence caused by the ascending motion of the bubbles could be effectively ignored. Consequently, the bubble pulsation process could be measured at stable hydraulic pressure. The pressure, bubble pulsation period and pulsation times generated by bubble expansion were measured in our experiments. The transient voltage and current were also measured. The relationship between bubble pulsation efficiency with discharge voltage and hydrostatic pressure was analyzed by combining the experimental results with results from simulations of bubble pulsation expansion.
Highlights
Isotropic water in a region with finite boundary is restrained by the boundary condition and is considered to be nonfree field water
The influence of discharge voltage and hydrostatic pressure on the bubble pulsation was investigated,[19] which was mainly reflected in two aspects, namely, the transformation of electrical energy to bubble expansion energy and the attenuation of the bubble pulsation energy
Transformation efficiency from electrical energy to bubble expansion energy According to the experimental data and expansion theory of bubbles in water, the approximate value of the maximum bubble pulsation expansion energy (Eb) could be obtained
Summary
Isotropic water in a region with finite boundary is restrained by the boundary condition and is considered to be nonfree field water. Keywords High-voltage discharge in water, transformation energy efficiency, residual rate of bubble pulsation energy, voltage, hydrostatic pressure The pressure waveform and pulsation period generated by the bubble expansion can be measured under various discharge voltages and hydrostatic pressure conditions.
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