Fundamental Characteristics of Gas-liquid Discharge Plasma Plumes

This paper mainly studies the spatio-temporal evolution process of gas-liquid discharge plasma plumes. By using a high-speed imaging system and digital image processing technology, the evolution patterns of the plumes under different parameters are quantitatively analyzed. The experimental results show that the initial voltage and solution conductivity significantly affect the morphological characteristics of the plasma plumes. Their height, area, and luminous intensity are all positively correlated with the initial voltage and solution conductivity. The longitudinal diffusion rate tends to stabilize (> 40 ms) in the later stage, maintaining a constant upward speed of 2 m/s. Under the influence of an external magnetic field, it is observed that when the N pole is upward, the plasma plumes rotate clockwise along the water surface, while when the N pole is downward, the plasma plumes rotate counterclockwise along the water surface. Secondly, the electrical characteristics of the plasma plumes are studied, including discharge voltage, current, and power. The peak current is linearly and positively correlated with both the initial voltage and solution conductivity; however, compared with the solution conductivity, the initial voltage shows a more obvious trend. Additionally, when the solution conductivity is changed, the current curves exhibit a crossing phenomenon. Due to the influence of the Lorentz force on the movement of charged particles, the external magnetic field significantly increases the peak current.