Realization of meter-scale and high-density of charged particles by surface dielectric barrier discharge

Abstract

Abstract Utilizing low-temperature plasma for the collection or removal of airborne particles presents a technology with significant potential applications. At atmospheric pressure, dielectric barrier discharge (DBD) is distinguished by its simplistic structure and safe, stable discharge properties. However, the majority of existing research on DBD devices concentrates on small-scale environments, with a notable absence of studies addressing the achievement of high-density diffusion of charged particles in expansive spaces. This study accomplishes the diffusion of high-density (exceeding 1 × 106 cm−3) ions over a meter-scale area through the combination of pulsed surface dielectric barrier discharge (SDBD) and a fan. The study details the impacts of various electrical (frequency, pulse width) and structural (electrode spacing distance, number of high voltage electrodes, dielectric thickness) parameters on ion generation. Experimental results demonstrate that an increase in frequency and pulse width positively influences ion concentration. Reducing the spacing distance between high voltage electrodes and augmenting the number of electrodes results in discharge suppression, a challenge that can be surmounted by elevating the pulse width and frequency. An expansive electrode spacing distance may lead to a diminished saturation ion concentration. Augmenting the thickness of the dielectric layer can enhance ion concentration by attenuating the uniformity of the discharge and decreasing the velocity of charged particle movement. The findings of this study offer valuable guidance for future applications of electrostatic methods in the large-scale removal of dust, fog, and haze from the air.