Investigation of Shockwave Produced by Large Volume Pulsed Discharge Under Water

Abstract

parameters and electrode gaps. Moreover, measurement and analysis of pressures of strong shockwaves were In this paper, the measurement and analysis of performed by using FUJI pressure measuring film, FUJI shockwaves generated by pulsed discharge in water are PHOTO FILM CO., LTD, with a wide pressure ranging made with FUJI pressure measuring film. When pressure from 2.5 to 10 MPa. Finally, the electrical discharge is applied, the reaction takes place between the color-parameters and electrode configuration are optimized for forming material and color-developing material coated on maximum energy transformation efficiency into the bases of the film, and color corresponding to the level shockwaves. of pressure is generated. Based on these results the energy transferred to the water and the average pressure of a II. EXPERIMENT AND DIAGNOSTICS shockwave are estimated. In addition, the electrical parameters and electrode configuration are optimized for The experimental set-up and some parameters of the maximum energy transformation efficiency into shock circuit elements are presented in Fig. 1. A Marx generator waves.was used for a high-voltage pulsed power source in our study. These capacitors connected in parallel were

Preparation of Few-Layer Graphene by Pulsed Discharge in Graphite Micro-Flake Suspension

“…Figure 8 shows typical discharge current and voltage curves of liquid pulsed discharge experiments, consisting of two processes (pre-breakdown and breakdown). According to previous studies [25,26,55], the pre-breakdown process during the beginning few microseconds reveals that the discharge voltage descends gradually from the values of charging voltage while the discharge Figure 8 shows typical discharge current and voltage curves of liquid pulsed discharge experiments, consisting of two processes (pre-breakdown and breakdown). According to previous studies [25,26,55], the pre-breakdown process during the beginning few microseconds reveals that the discharge voltage descends gradually from the values of charging voltage while the discharge current oscillates at a low value.…”

“…Meanwhile, the strong electric field between two electrodes induces the ionization of the water molecules. The subsequent breakdown process, in which the suspension between two electrodes breaks down to generate a strong plasma tunnel, features the typical damped cosine-wave discharge voltage after a rapid decrease and a damped sine-wave discharge current [25,26]. Following this, the ions and atoms (H, O, OH − , etc.)…”

“…Liquid pulsed discharge refers to the phenomenon that the liquid medium between two electrodes breaks down because of the pulsed discharge, leading to the formation of strong plasma tunnel at high temperature and inner pressure. The generated atoms and ions burst into medium with a strong shockwave and cavitation bubble collapse subsequently [25,26]. Liquid pulsed discharge is utilized for degradation of organic [27,28], cell sterilization [29] in water and other applications [30,31].…”

Theoretical Analysis of a High Step-up Bipolar Voltage Multiplier

“…In recent years, the non-thermal food processing attracts much researchers' attention [1], because it does not destroy nutrients of foods unlike a general cooking process. Among them, the non-thermal food processing by utilizing an underwater shockwave can be realized at relatively low cost and safety [2].…”

Synthesis of a High Step-up Bipolar Voltage Multiplier Using Level Shift Drivers

“…The cooking process, which is generally used for processing foods, has a problem that nutrients of foods are destroyed by heating. Therefore, a non-thermal food processing attracts much researchers' attention [1], because it does not destroy the nutrients of foods. Among them, we focus on the non-thermal food processing by utilizing an underwater shockwave [2], because it can be realized at relatively low cost and safety.…”