scholarly journals The Changes in Electrical and Interfacial Properties of Polyimide Exposed to Dielectric Barrier Discharge in SF6Medium

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hafiz Z. Alisoy ◽  
Murat Koseoglu
Keyword(s):  
Surface Energy ◽  
Charge Density ◽  
Surface Charge ◽  
Dielectric Barrier Discharge ◽  
Formation Mechanism ◽  
Surface Charge Density ◽  
Barrier Discharge ◽  
Depolarization Current ◽  
Dielectric Barrier ◽  
Space Charges

The formation mechanism of space charges in polyimide (PI) which was exposed to dielectric barrier discharge (DBD) in SF6medium and the effects of the space charges on interfacial and electrical properties of PI were investigated. The variation of normalized surface charge density on PI sample was calculated and illustrated for different DBD exposure times. The surface potential was measured to determine the effect of the space charges on the sample. Then, the contact angle values were measured to obtain the relation between the surface energy and the surface charge density. The expressions for the total charge and the concentration of trapped electrons were derived by using Poisson and continuity equations at stationary state. The space charges were determined experimentally by using thermally stimulated depolarization current (TSDC) method. Also, SEM image and FTIR spectrum of virgin and treated samples were presented to observe the structural variations. It was seen that the approach for the formation mechanism of the space charges agreed with the experimental data. However, it was concluded particularly for the short-time DBD treatments that the space charges accumulated in the sample should be considered besides the effects of surface functionalization in the determination of the surface energy.

Electrical modeling of dielectric barrier discharge considering surface charge on the plasma modified material

2020 ◽  
Vol 29 (7) ◽  
pp. 075204
Author(s):  
Hong-Lu Guan ◽  
Xiang-Rong Chen ◽  
Tie Jiang ◽  
Hao Du ◽  
Ashish Paramane ◽  
...  
Keyword(s):  
Surface Charge ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Dielectric Barrier ◽  
Electrical Modeling

Surface charge in dielectric barrier discharge plasma actuators

2008 ◽  
Vol 15 (7) ◽  
pp. 073505 ◽  
Author(s):  
D. F. Opaits ◽  
M. N. Shneider ◽  
Richard B. Miles ◽  
A. V. Likhanskii ◽  
S. O. Macheret
Keyword(s):  
Surface Charge ◽  
Dielectric Barrier Discharge ◽  
Discharge Plasma ◽  
Barrier Discharge ◽  
Plasma Actuators ◽  
Dielectric Barrier Discharge Plasma ◽  
Dielectric Barrier ◽  
Barrier Discharge Plasma

Formation mechanism of dot-line square superlattice pattern in dielectric barrier discharge

2014 ◽  
Vol 21 (11) ◽  
pp. 113504 ◽  
Author(s):  
Weibo Liu ◽  
Lifang Dong ◽  
Yongjie Wang ◽  
Xinpu Zhang ◽  
Yuyang Pan
Keyword(s):  
Dielectric Barrier Discharge ◽  
Formation Mechanism ◽  
Barrier Discharge ◽  
Dielectric Barrier

Distribution and evolution of surface charge in surface dielectric barrier discharge driven by AC and pulse dual power supply

2021 ◽  
Author(s):  
Siqi Yu ◽  
Huijie Yan ◽  
Jiaqi Li ◽  
ting li ◽  
Yuying Wang ◽  
...  
Keyword(s):  
Surface Charge ◽  
Dielectric Barrier Discharge ◽  
Power Supply ◽  
Barrier Discharge ◽  
Surface Charges ◽  
Dielectric Barrier ◽  
Positive Pulse ◽  
Surface Dielectric Barrier Discharge ◽  
Filamentary Discharge ◽  
Dual Power

Abstract The evolution of surface charge in surface dielectric barrier discharge (SDBD) is observed by using Pockels effect. SDBD is driven by sine AC and pulse dual-power supply voltage. The filamentary discharge and glow-like discharge are enhanced by superimposing positive pulse on sine trough and negative pulse on sine crest, respectively. The interval of enhanced discharge is adjusted by pulse repetition rate (PRF). The formation and decay of surface charges are analyzed at low PRF, and the accumulation effect is analyzed at high PRF. The results showed that the decay rates of charges decrease with increasing distance from the exposed electrode. When a positive pulse is superimposed on sine trough, the traces of positive charges are filaments with long extending lengths, which are the footprints of discharge channels. The lifetime of positive charges is hundreds of AC cycles (tens of milliseconds). Under certain conditions, subsequent glow-like discharge evolves as “flying” above the dielectric surface (3D propagation). Most of the negative charges are neutralized in subsequent filamentary discharge. Some negative charges accumulate downstream and exist longer than positive charges. In the case of negative pulses superimposed on sine crest, the enhanced glow-like discharge appears 3D propagation. The propagation distance is much smaller than that of positive pulse. Most of the negative charges are uniformly distributed near the exposed electrodes with a short lifetime (a few hundred microseconds) and are quickly neutralized in subsequent discharges. The occurrence of 3D propagation requires certain conditions and the mechanism needs further research.

scholarly journals Effects of plasma kinetic modeling on performance characterization of plasma actuators for active flow control

2020 ◽  
Vol 197 ◽  
pp. 10004
Author(s):  
Donato Fontanarosa ◽  
Giacomo Cinieri ◽  
Maria Grazia De Giorgi ◽  
Antonio Ficarella
Keyword(s):  
Charge Density ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Fluid Model ◽  
Active Flow Control ◽  
Operating Conditions ◽  
Dielectric Barrier ◽  
Plasma Kinetics ◽  
Model Based ◽  
Plasma Reactions

This work focuses on the development of a multiscale computational fluid dynamics (CFD) simulation framework for the investigation of the effects of plasma kinetics on the performance of a microscale dielectric barrier discharge plasma actuator (DBD-PA). To this purpose, DBD-PA multi-scale dual-step modelling approach has been implemented, by considering plasma chemistry and flow dynamic. At first, a microscopic plasma model based on the air plasma kinetics has been defined and plasma reactions have been simulated in zero-dimensional computations in order to evaluate the charge density. At this aim computations have been performed using the toolbox ZDPlasKin, which solves plasma reactions by means of Bolsig+ solver. An alternate current (AC) electrical feeding has been assumed: in particular, the sinusoidal voltage amplitude and the frequency have been fixed at 5 kV and 1 kHz at atmospheric pressure and 300 K temperature in quiescent environment. The predictal charge density has been in a macroscopic plasma-fluid model based on Suzen Dual Potential Model (DPM), which has implemented in the computation fluid dynamic CFD code OpenFoam. Hence, as second step, 2D-CFD simulations of the electro-hydrodynamic body forces induced by the microscale DBDPA have been performed, based on the previously predicted charge densities at the operating conditions. Quiescent flow over a dielectric barrier discharge actuator has been simulated using the plasma-fluid model. The novel modelling framework has been validated with experimental data.

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