Parametric Survey for Efficient DeNOx by Direct Decomposition of NO Using an Intermittent DBD Generated by a One-Cycle Sinusoidal Power Source

2007 ◽  
Vol 10 (2) ◽  
Author(s):  
Ken Yukimura ◽  
Hiroshi Murakami ◽  
Masayuki Itoh
Keyword(s):  
Gas Flow ◽  
Room Temperature ◽  
Barrier Discharge ◽  
Electrical Power ◽  
Power Source ◽  
Injection System ◽  
Gas Flows ◽  
Mixing Zone ◽  
Dbd Plasma ◽  
Decomposition Of No

AbstractNO gas is directly decomposed using an intermittent DBD plasma generated by a one cycle sinusoidal power source. Previously, we have developed an ammonia radical injection system, where ammonia radicals were produced by a dielectric barrier discharge (DBD) in a chamber, called a radical injector, which is separate from the chamber in which NO gas flows. The radicals are injected into the mixing zone in the NO gas flow field to decompose NO gas. The power source for generating the DBD is a one-cycle sinusoidal (OCS) waveform so as to easily control the electrical power consumed in the DBD plasma. The fundamental frequency of the OCS power source is 150 kHz. In this paper, we used the same power source, but NO was decomposed directly by the plasma; that is, NO gas is in the DBD plasma. NO gas was varied from room temperature to approximately 400 C, where the effect of DeNOx characteristics were discussed. By optimizing parameters for DeNOx, an energy efficiency of 100 g/kWh was obtained.

Wall Normal Jet Produced by DBD Plasma Actuator With Doughnut-Shaped Electrode

2008 ◽  
Author(s):  
Takehiko Segawa ◽  
Hiro Yoshida ◽  
Shinya Takekawa ◽  
Timothy Jukes ◽  
Kwing-So Choi
Keyword(s):  
Atmospheric Pressure ◽  
Room Temperature ◽  
Particle Image ◽  
Barrier Discharge ◽  
Plasma Actuator ◽  
Dbd Plasma ◽  
Annular Jet ◽  
Image Velocimetry ◽  
Inner Diameter ◽  
Annular Jets

Properties of coaxial annular jets produced by a dielectric barrier discharge (DBD) plasma actuator with a doughnut shaped electrodes were investigated under atmospheric pressure and room temperature. The actuator consists of two circular electrodes sandwiching a thin dielectric layer. By applying 0 – ±3.3 kV between the electrodes at radio frequencies, the plasma jet is formed near the inner edge of the top electrode. The radial jet runs toward the center of the electrode and then impinges at the center to generate a wall normal annular jet. The evolution of the wall normal jet was observed precisely using particle image velocimetry (PIV) system. It was found that characteristic velocities increase in proportion to the bursting frequency and inversely proportional to the inner diameter of the electrode at the surging time of the voltage at 5.0 × 10−6sec.

Present Status of Fault Injection Research for Testability Demonstration and Evaluation

2011 ◽  
Vol 328-330 ◽  
pp. 587-590
Author(s):  
Jian Yang Zhao ◽  
Xiao Min Li ◽  
Yang He
Keyword(s):  
Fault Injection ◽  
Electrical Power ◽  
Power Source ◽  
Injection System ◽  
Control Module ◽  
Injection Test ◽  
Evaluation Test ◽  
Injection Technology ◽  
Fly Control ◽  
Test Result

This paper analyses the exiting fault injection technology completely which is a key role in the testability demonstration and evaluation test, lists the problems it faces and proposes a synthetical fault injection system platform to solve the problems. Finally, a fault injection test is done on the secondary electrical power source system of a missile’s fly control module and the test result shows that the platform is much more convenient, efficient and practical in project.

Plasma-induced highly efficient synthesis of boron doped reduced graphene oxide for supercapacitors

2016 ◽  
Vol 52 (73) ◽  
pp. 10988-10991 ◽  
Author(s):  
Shaobo Li ◽  
Zhaofeng Wang ◽  
Hanmei Jiang ◽  
Limei Zhang ◽  
Jingzheng Ren ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Barrier Discharge ◽  
Efficient Synthesis ◽  
Ambient Conditions ◽  
Plasma Technology ◽  
Dbd Plasma ◽  
Dielectric Barrier ◽  
Boron Doped ◽  
Reduced Graphene

In this work, we presented a novel route to synthesize boron doped reduced graphene oxide (rGO) by using the dielectric barrier discharge (DBD) plasma technology under ambient conditions.

Co-Current and Countercurrent Migration of Gas Kicks in “Horizontal” Wells

1999 ◽  
Vol 121 (2) ◽  
pp. 96-101 ◽  
Author(s):  
H. Baca ◽  
J. Smith ◽  
A. T. Bourgoyne ◽  
D. E. Nikitopoulos
Keyword(s):  
Test Section ◽  
Gas Flow ◽  
Gas Injection ◽  
Horizontal Wells ◽  
Gas Flows ◽  
Countercurrent Flow ◽  
Drilling Operations ◽  
Operating Window ◽  
Annular Pipes ◽  
Injection Rates

Results from experiments conducted in downward liquid-gas flows in inclined, eccentric annular pipes, with water and air as the working fluids, are presented. The gas was injected in the middle of the test section length. The operating window, in terms of liquid and gas superficial velocities, within which countercurrent gas flow occurs at two low-dip angles, has been determined experimentally. The countercurrent flow observed was in the slug regime, while the co-current one was stratified. Countercurrent flow fraction and void fraction measurements were carried out at various liquid superficial velocities and gas injection rates and correlated to visual observations through a full-scale transparent test section. Our results indicate that countercurrent flow can be easily generated at small downward dip angles, within the practical range of liquid superficial velocity for drilling operations. Such flow is also favored by low gas injection rates.

DBD plasma reactor for oxidative decomposition of Chlorobenzene

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
L. Sivachandiran ◽  
J. Karuppiah ◽  
Ch. Subrahmanyam
Keyword(s):  
Barrier Discharge ◽  
Copper Wire ◽  
Plasma Reactor ◽  
Aluminum Foil ◽  
Low Flow ◽  
Dbd Plasma ◽  
Silver Paste ◽  
Oxidative Decomposition ◽  
Gaseous Products

Abstract Oxidative decomposition of chlorobenzene diluted in air was carried out in a dielectric barrier discharge reactor. In order to understand the role of the ground electrode, various reactor configurations were tested. Among silver paste, copper wire and aluminum foil tested as the outer electrodes, typical results indicated the best performance of silver paste, probably due to uniform distribution of microdischarges. Likewise, low flow rates gave better conversion and selectivity to gaseous products.

scholarly journals Polymerization of D-Ribose in Dielectric Barrier Discharge Plasma

Plasma ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 144-149 ◽  
Author(s):  
Yingying Li ◽  
Rida Atif ◽  
Ketao Chen ◽  
Jiushan Cheng ◽  
Qiang Chen ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Discharge Plasma ◽  
Barrier Discharge ◽  
Laser Desorption ◽  
Laser Desorption Ionization ◽  
Dielectric Barrier Discharge Plasma ◽  
Dbd Plasma ◽  
Dielectric Barrier ◽  
Ionization Time ◽  
Barrier Discharge Plasma

Dielectric barrier discharge (DBD) plasma has been found to uniquely polymerize ribose that is not usually subject to polymerization since molecules that tend to polymerize almost always possess at least a π-bond. The polymer was analyzed via nuclear magnetic resonance (NMR) spectra, matrix-assisted laser desorption ionization time-of-flight (MALDI TOF) mass spectroscopy and Fourier-Transform inferred spectroscopy (FTIR), and it was found that dehydration occurs during polymerization.

Surface Modification on Polyamide 6.6 with Double Barrier Discharge (DBD) Plasma to Optimise Dyeing Process by Direct Dyes

2010 ◽  
Vol 636-637 ◽  
pp. 846-852 ◽  
Author(s):  
Fernando R. Oliveira ◽  
A.P. Souto ◽  
Noemi Carneiro ◽  
J.H.O. Nascimento
Keyword(s):  
Photoelectron Spectroscopy ◽  
Barrier Discharge ◽  
Microstructural Analysis ◽  
Atmospheric Conditions ◽  
Acid Dyes ◽  
Direct Dyes ◽  
Dbd Plasma ◽  
Double Barrier ◽  
Dyeing Process ◽  
Polyamide 6.6

Dyeing of polyamide fibers is normally made with acid dyes, however, it is somewhat difficult to achieve uniformity and control of pH and temperature must be carefully made. The possibility to dye polyamide 6.6 in a larger gamut of colours with good properties may be achieved using other classes of dyes after plasmatic modifications in textile substrates. Polyamide 6.6 fabrics were treated with Double Barrier Discharge (DBD) plasma obtained at atmospheric conditions in a semi-industrial machine and very positive results were obtained when dyeing is made with direct dyes. Surface modifications were evaluated, namely, roughness in terms of Atomic Force Microscopy, changes in chemical composition by X-Ray Photoelectron Spectroscopy (XPS) and microstructural analysis by SEM. In order to optimize dyeing process, different dye concentrations, pH and temperatures were attempted on dyeing with DBD treated fabrics. Important parameters were studied such as exhaustion, colour strength (K/S) and washing fastness. Chemical and physical effects of plasmatic discharge contribute to excellent results obtained in yield, exhaustion and fastness of dyeing of polyamide with direct dyes demonstrating extensive improvement of dye exhaustion from baths, easily achieving 100% in shorter dyeing times. These results mean less dyes in effluents and less time for dyeing processes. The cleanness of the processes and lower cost of direct dyeing are additional advantages when compared to difficulties in acidic dyeing of polyamide.

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