Fundamental characteristics of single dielectric barrier discharge plasma actuator using magnetic fluid
Takuya Kuwahara*, Yusuke Asaka
* The author to whom correspondence should be addressed.
Department of Mechanical Engineering, Nippon Institute of Technology, Japan
Abstract
A single dielectric barrier discharge (DBD) plasma actuator using magnetic fluid (MF), termed "MF-DBD plasma actuator,'' is proposed and developed. The MF-DBD plasma actuator can be applied to fanless air purification devices that can collect low-resistive particulate matter, such as diesel particulate by electrostatic force without re-entrainment. The mechanism of ionic wind generation in the MF-DBD plasma actuator is discussed based on the mechanism in conventional DBD plasma actuators. Ionic wind, temperature distribution, ozone, and ion concentrations are investigated to obtain the fundamental characteristics of the MF-DBD plasma actuator. Consequently, the brightness and length of the nonthermal plasma (NTP) discharge increase with an increase in the input voltage to the high-voltage AC power supply. The positive values of the discharge voltage and current are greater than the negative absolute values. This phenomenon can be explained using the ionic wind generation mechanism. A spike movement on the MF surface is observed. Based on the temperature analysis, natural convection occurs inside the MF and convection suppresses the temperature increase of the MF by self-cooling. The characteristics of ion wind velocity with respect to the input voltage and discharge current are similar to those of conventional DBD plasma actuators. The relationship between ozone concentration and the input voltage is clarified. Based on ion concentration measurements, negative ion concentration is extremely low overall. The characteristic of positive ions with respect to the input voltage is obtained.
Keywords - Nonthermal plasma, magnetic fluid, dielectric barrier discharge, ozone, ionic wind.