Velocity Measurement of EHD Flow Produced by Pin-Multi Concentric Ring Electrodes Generator

2015 ◽  
Vol 771 ◽  
pp. 227-231 ◽  
Author(s):  
Sumariyah ◽  
Kusminarto ◽  
Arief Hermanto ◽  
Pekik Nurwantoro
Keyword(s):  
Stainless Steel ◽  
Corona Discharge ◽  
High Voltage ◽  
Velocity Measurement ◽  
Maximum Velocity ◽  
Ring Electrode ◽  
Hot Wire ◽  
Concentric Ring ◽  
Active Electrode ◽  
Single Ring

Study of EHD flow by using generator corona discharge with electrodes configuration of pin to multi concentric rings (MCR) and pin to single ring (SR) have been curried out. We measured the velocity of EHD flow and determined the comparison of velocity of EHD flow produced by pin to single ring electrodes. The pin needle was made by stainless steel with a length of 50 mm and a tip diameter of 0.14 mm. The multi-ring electrodes constracted by three concentric rings with a metal material connected to each other and each ring has a diameter of 24 mm, 16 mm and 8 mm in width and the same ring thickness is 2 mm and 3 mm. Single ring electrode has a diameter, width and thickness respectively 24 mm , 3 mm and 2 mm. EHD was generated by using a DC high voltage of 10 kV. Pin as an active electrode of corona discharge and concentric rings multi/single ring electrodes as ions collector and passive electrodes. The velocity of EHD flow was measured by a hot-wire anemometer. We found that the velocity of EHD flow with multi-ring concentric electrodes larger than a single ring electrode. The measurement of velocity for two cases of electrodes configuration were limited at the certain voltage due to breackdown and arc phenomena. The maximum velocity of the of EHD flow using a pin-multi rings concentric was 0.7 m/s at a voltage of 6 kV.

scholarly journals The Study of EHD Flow:Velocity and electrical power

2018 ◽  
Vol 156 ◽  
pp. 02016
Author(s):  
Sumariyah ◽  
Kusminarto ◽  
Arief Hermanto ◽  
Pekik Nuswantoro
Keyword(s):  
Electric Field ◽  
Corona Discharge ◽  
High Voltage ◽  
Electrical Power ◽  
Negative Polarity ◽  
Ring Electrode ◽  
Positive Polarity ◽  
Concentric Ring ◽  
Single Ring ◽  
Gas Medium

Electrohydrodynamics (EHD) flow is the yield of the corona discharge. Corona discharge characterized by electrical phenomena that occur together in a gas medium under the influence of an electric field. In corona discharge, the electric field is not homogeneous due to the geometry of the electrode configuration. In this study, a pin-multi concentric ring electrode (P-MRE) and pin-single ring electrode (P-SRE) has been used as electrodes configuration. The objective of this research is to get the velocity of EHD flow and determining the electrical power of the EHD flow. EHD flow generated by a DC high voltage (up to 5 kV). The pin electrode was connected to a positive polarity and electrode ring/multi-concentric rings to negative polarity. Based on our result, we make a comparison of two types of corona configurations. The results were obtained that, EHD flow velocities with the P-MRE was greater than the P-SRE for the same distance and voltage. We found that u-P characteristics of EHD flow with the P-MRE and P-SRE follow relationship as u ∞ P1/3.

scholarly journals Design and Optimization of Detection Antenna for Corona Discharge in High-voltage Transmission Lines

2020 ◽  
Vol 1486 ◽  
pp. 062024
Author(s):  
Xiaoming Xiao ◽  
Weinan Hu ◽  
Jun Ran ◽  
Zheng Xu ◽  
Guoyu Hei ◽  
...  
Keyword(s):  
Corona Discharge ◽  
High Voltage ◽  
Transmission Lines ◽  
Design And Optimization ◽  
High Voltage Transmission

scholarly journals Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding

2016 ◽  
Vol 4 ◽  
Author(s):  
Yingxia Wei ◽  
Yaoxiang Liu ◽  
Tie-Jun Wang ◽  
Na Chen ◽  
Jingjing Ju ◽  
...  
Keyword(s):  
Experimental Study ◽  
Femtosecond Laser ◽  
Electric Field ◽  
Corona Discharge ◽  
High Voltage ◽  
Fluorescence Spectra ◽  
Spectroscopic Analysis ◽  
Laser Pulses ◽  
Spectroscopic Measurement ◽  
High Electric Field

We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fluorescence spectra from neutral and ionic air molecules were measured and compared with pure high-voltage CD and pure laser filamentation (FIL). Among them, high electric field assisted laser FIL produced nitrogen fluorescence more efficiently than either pure CD or pure FIL processes. The nonlinear enhancement of fluorescence from the interaction of the laser filament and corona discharging electric field resulted in a more efficient ionization along the laser filament zone, which was confirmed by the spectroscopic measurement of both ionization-induced fluorescence and plasma-scattered 800 nm laser pulses. This is believed to be the key precursor process for filament-guided discharge.

Hybrid elevated-temperature, low/high-voltage plasma immersion ion implantation of AISI304 stainless steel

2001 ◽  
Vol 135 (2-3) ◽  
pp. 178-183 ◽  
Author(s):  
X.B. Tian ◽  
Y.X. Leng ◽  
T.K. Kwok ◽  
L.P. Wang ◽  
B.Y. Tang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Ion Implantation ◽  
High Voltage ◽  
Plasma Immersion Ion Implantation

Numerical Study for Effect of Staggered Wire Electrodes in a Electrostatic Precipitator

2019 ◽  
Author(s):  
Hoyeon Choi ◽  
Yong Gap Park ◽  
Man Yeong Ha
Keyword(s):  
Electric Field ◽  
Corona Discharge ◽  
Reference Frame ◽  
High Voltage ◽  
Current Density ◽  
Electrostatic Precipitator ◽  
Collection Efficiency ◽  
Electric Force ◽  
Wire Electrode ◽  
Particle Charging

Abstract In this paper, a numerical model was developed to describe the wire-plate electrostatic precipitator, commonly called electronic air cleaners. Electrostatic precipitator have been widely used to control particulate pollutants, which adversely affect human health. In this model, the complex interactions between fluid dynamics, electric fields and particle dynamics are considered. Therefore different approach methods are used in this study for each field, Eulerian reference frame was used for the fluid flow field and the electric field, Lagrangian reference frame used for the particles trajectories. In order to describe corona phenomena around high voltage electrode, electric field and ion current density field in electrostatic precipitator are numerically calculated using the iterative method for corona discharge model suggested by Kim (2010). The most important concept in electrostatic precipitator is the electric force applied to particles through the particle charging phenomena. The charge acquired by the particle in the corona region was obtained by combining the field charge, the diffusion charge and the time available for charging being the residence time of the particle in the corona region. In order to simulate more accurately, the charging model suggested by Lawless (1996) is used for the charging phenomena of particles by corona discharge because this model was designed to predict combination effect of diffusion charge and field charge. The diminution of particle concentration along the collection plate was derived from Deutsch’s theory, and migration velocity of the particle was developed from the condition that the magnitude of Coulomb force is equal to that of Stoke’s resistance force. This model is implemented by UDF in commercial software Fluent and validated with experimental and numerical results from literatures. CFD results had been compared with various experimental data obtained by Penney&Matick, Parasram and Kihm. Our results shows good agreement in terms of distributions of electric potential, current density, electrohydrodynamic flow pattern, and particle trajectories as well as corona current and collection efficiency. From this simulation, the effect of wire arrangement on electrostatic precipitator characteristics and particle charging are investigated. Both inline and staggered arrangements of wire electrode have been considered for fixed values of gas velocity equal to 2m/s. Applied voltage on wire electrode varies 6∼13kV and particle diameter is 4μm. For low voltage condition, staggered arrangement of wire electrode caused the turbulent effect so that collection efficiency increase more than inline arrangement. However, collection efficiency decrease in high voltage condition because electric force applied on particles passing between the wire electrodes is canceled out by both side wire electrodes.

scholarly journals Single-Pass Cladding Process Using Hot-wire Gas Metal Arc Welding Technique

2019 ◽  
Vol 269 ◽  
pp. 01006
Author(s):  
Pattanawit Suntiniwat ◽  
Eakkachai Warinsiriruk ◽  
Sutep Joy-A-Ka
Keyword(s):  
Stainless Steel ◽  
Gas Metal Arc Welding ◽  
Ccd Camera ◽  
Travel Speed ◽  
Hot Wire ◽  
Single Pass ◽  
High Production Rate ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Wire Filler

The aim of this study is to improve cladding process productivity by high production rate with low dilution process by specifying technique as hot-wire GMAW process. The base metal of carbon steel A516 Gr70 was cladded by austenitic stainless steel 309LSi for creating a buttering layer and stainless steel 308LSi for hot-wire filler for topping a cladding layer in a one-pass run. The studied parameters this experiment consist of the feeding ratio of hot wire feeding speed per GMAW wire feeding speed and travel speed. Welding phenomenon during welding was observed by CCD camera with specifying the optical device to see the appropriate condition. The result showed the hot-wire GMAW cladding process could reduce cycle time 3.5 times compare with conventional FCAW cladding process. Moreover, dilution of this process could decrease lower than 15% with acceptable FN 3 on the top of weld surface. Therefore, single pass cladding process achieved by using this method with low dilution by still keep microstructure capability.

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