Dielectric Barrier Discharge Characteristics of Multineedle-to-Cylinder Configuration

Abstract

Abstract:A dielectric barrier discharge (DBD) produces a homogenous discharge with low energy consumption, offering broad developmental prospects, and this discharge process is also the mechanism through which charges are transported. Higher reaction efficiency is achieved when more charges are transported. Focusing on the electrode configuration of the multineedle-to-cylinder (MC) system, i.e., the structure of needles arrayed on the inner coaxial rod, the effect of needle arrangement, including needle length (NL), inter axial needle distance (ID), and inter axial needle rotation angle (INRA), on the transported charge per cycle and discharge power in DBDs is investigated. The finite-element method (FEM) and quasi-static field simulation are adopted to study the active region (AR) where the electric field strength exceeds the breakdown electric field strength between MC electrodes because this region plays a dominant role in DBD. The improvement of its volume ratio in the reactor allows an increase in discharge power. The simulation results are in accordance with the experimental results, which illustrate that quasi-static field simulation is effective and reliable. Simulation results show that mutual effects of nearby needles and between needles and the inner rod exist. As a result, shorter ID (1.5 mm), needles with similar lengths (3.5 mm) are arranged, and an INRA of 0° is proven to be the optimal structure because it produces the highest AR volume ratio. The result is experimentally validated by transported charges per cycle and discharge power obtained through Lissajous figures. OPEN ACCESSEnergies 2011, 4 2134

Experimental study on the optimization of dielectric barrier discharge reactor for NO<inf>x</inf>treatment

“…Dielectric barrier discharge reactors are used more often than other types of plasma reactors in environmental applications as a result of the easy formation of stable plasmas, homogeneous discharge, scalability, effectiveness and low operating cost [12,13]. Due to the presence of at least one dielectric barrier between the electrodes in DBD reactors, the discharge power into the gas requires a higher voltage and therefore a higher electric field [12].…”

“…Moreover, they showed that increasing the length of the reactor can increase the removal efficiency of NO. In 2011 and 2012, Wang et al [13,17] studied a Multineedle-to-Cylinder Configuration of DBD reactor experimentally and numerically and investigated the effect of needles arrayed structure and needle arrangement on the inner electrode. They showed that by using the Multineedle-to-Cylinder system, higher performance of DBD reactor can be achieved compared to the regular DBD reactor.…”

Numerical Modelling of Mutual Effect among Nearby Needles in a Multi-Needle Configuration of an Atmospheric Air Dielectric Barrier Discharge

“…Our previous study showed that the MC configuration reduced the initial discharge and operating voltages as well as improved the transported charges compared with the coaxial configuration, both at 50 Hz and at higher frequencies (17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29) [9,16]. Meanwhile, a quasi-static field simulation based on three-dimensional (3-D) finite-element method (FEM) was employed to investigate the DBD characteristics of MC configurations, which was experimentally confirmed in [11].…”

“…Generally, plane-to-plane or coaxial structures are adopted for DBD electrodes [1]. To increase the energy-input efficiency, improvements for the two structures have been proposed, such as multineedle-to-plane (MP) [5,7,10], mesh-to-plate [3,8], trench-to-plane [12,13], and multineedle-to-cylinder (MC) configurations [9,11]. These configurations have been proven better for some applications because they can generate non-uniform electric fields in space, resulting in low operating voltage and low dielectric loss, which are beneficial for commercial applications.…”

“…The first, which study the actual application of DBDs, are primarily implemented through experimental observation [3,5,[7][8][9] and theoretical analysis [5,10,11]. They mainly aim at improving the plasma-treatment efficiency and reducing energy consumption.…”