Étude d'une décharge supersonique applicable au traitement des effluents gazeux

2004 ◽  
Vol 82 (10) ◽  
pp. 827-842
Author(s):  
S Pellerin ◽  
J Chapelle
Keyword(s):  
Nitrogen Oxides ◽  
Flow Rate ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Air Flow ◽  
Industrial Applications ◽  
Gas Flow Rate ◽  
Turbulent Region ◽  
Cold Plasmas ◽  
Sliding Discharge

The use of sliding discharge in air is characterized by the emission of important quantities of nitrogen oxides NOx. We have shown that the utilization of convergent-divergent Laval's nozzle working in supersonic air flow offered the possibility to obtain, from the atmospheric pressure and with high gas flow rate, cold plasmas of interest for different industrial applications, without production of NOx. The very turbulent region of the shockwave, can present a great interest for the mix and the interaction of reactive species formed in the uphill flow.

Facile growth of centimeter-sized single-crystal graphene on copper foil at atmospheric pressure

2015 ◽  
Vol 3 (15) ◽  
pp. 3530-3535 ◽  
Author(s):  
Jing Li ◽  
Xuan-Yun Wang ◽  
Xing-Rui Liu ◽  
Zhi Jin ◽  
Dong Wang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Flow Rate ◽  
Atmospheric Pressure ◽  
Copper Foil ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Single Crystalline ◽  
Slowing Down ◽  
Cu Foil

By mildly oxidizing Cu foil and slowing down the gas flow rate, centimeter-sized single-crystalline graphene was grown on Cu at atmospheric pressure.

scholarly journals EFFECT OF NAOH CONCENTRATION AND RESIDENCE TIME ON THE CONVERSION OF REMOVAL OF Ca2+ AND Mg2+ IN SEAWATER CONTINUOUSLY USING AN BAFFLED REACTOR

Konversi ◽  
2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Dita Nurmala Tristanti ◽  
Harishul Ulum ◽  
Soemargono Soemargono ◽  
Nove Kartika Erliyanti
Keyword(s):  
Residence Time ◽  
Flow Rate ◽  
Gas Flow ◽  
Air Flow ◽  
Gas Flow Rate ◽  
Flow Rates ◽  
Naoh Solution

The aims of this study were to determine the effect NaOH concentration and residence time on the conversion of calcium (Ca2+) and magnesium (Mg2+) removal as impurities. The concentration of NaOH used in this study were 0.05N, 0,1N, 0.15N, and 0,2N. The reactor used in this study is an baffled reactor equipped with air as a stirrer with air flow rates of 10000, 15000, 20000, 25000, and 30000 ml/minute. The ratio between the flow rate of seawater toward the flow rate of NaOH solution in this study was 85ml/minute : 25ml/minute.The results showed that the NaOH concentration and residence time had a significant effect on the conversion of removal of (Ca2+) and magnesium (Mg2+) impurities. The best results were obtained at 0.25N NaOH concentration, residence time of 13,08 minute, and gas flow rate of 30000ml/minute with removal conversion of calcium (Ca2+) of 73.083% and magnesium (Mg2+) of 89.621%.

Uniform Ultra-Thin Oxides Grown by Rapid Thermal Oxidation of Silicon in N2O Ambient

1997 ◽  
Vol 470 ◽  
Author(s):  
G. C. Xing ◽  
D. Lopes ◽  
G. E. Miner
Keyword(s):  
Thermal Oxidation ◽  
Process Parameters ◽  
Flow Rate ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Rotation Speed ◽  
Oxide Thickness ◽  
Gas Flow Rate ◽  
Rapid Thermal Oxidation ◽  
Nitrogen Concentrations

ABSTRACTIn this paper, we report the study of rapid thermal oxidation of silicon in N2O ambient using the Applied Materials RTP Centura rapid thermal processor, and N2O oxide thickness and compositional uniformities with respect to gas flow rate and wafer rotation speed as well as other process parameters. It was found that N2O oxide uniformity is strongly dependent on gas flow rate and wafer rotation speed in addition to process pressure. With optimized setting of the process parameters, excellent oxidation uniformities (one sigma < 1%) were obtained at atmospheric pressure N2O ambient. Nitrogen concentrations of such uniform oxides grown at 1050°C atmospheric pressure N2O oxidation processes were 1.7% for a 40Å oxide and 2.5% for a 60Å oxide, respectively, as characterized by SIMS analysis.

The effect of methane gas flow rate on the streamer propagation in an atmospheric-pressure methane-air plasma jet

2018 ◽  
Vol 25 (9) ◽  
pp. 093508 ◽  
Author(s):  
Jinsong Kang ◽  
Muyang Qian ◽  
Gui Li ◽  
Sanqiu Liu ◽  
Chunsheng Ren ◽  
...  
Keyword(s):  
Flow Rate ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Plasma Jet ◽  
Air Plasma ◽  
Gas Flow Rate ◽  
Methane Gas ◽  
Streamer Propagation

Investigation of a Plasma Jet Generated by High Voltage Discharge at Atmospheric Pressure

2011 ◽  
Vol 383-390 ◽  
pp. 5907-5911 ◽  
Author(s):  
Xue Chen Li ◽  
Ning Yuan ◽  
Peng Ying Jia
Keyword(s):  
Flow Rate ◽  
High Voltage ◽  
Discharge Current ◽  
Applied Voltage ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Plasma Plume ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Uniform Plasma

Appling a high voltage to the dielectric barrier discharge device in a coaxial geometry in flowing argon, a uniform plasma plume is generated at one atmospheric pressure. The waveforms of discharge current and the applied voltage are investigated and results indicate that both the intensity and duration width of the discharge current pulse increase with increasing the applied voltage. The gas temperature of the plasma plume is investigated by using an infrared thermometer. The gas temperature of the plasma plume are functions of gas flow rate, peak value and the frequency of the applied voltage. Results show that the gas temperature increases with increasing the applied voltage or its frequency, while it decreases with increasing the gas flow rate. A qualitative explanation is given for the variance of gas temperature as functions of the experimental parameters by analyzing the waveforms of the discharge current and the applied voltage.

scholarly journals Effect of gas flow rate on breakdown voltage in a rotating gliding arc reactor

2021 ◽  
pp. 42-46
Author(s):  
Ananthanarasimhan J ◽  
Lakshminarayana Rao
Keyword(s):  
Breakdown Voltage ◽  
Flow Rate ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Arc Discharge ◽  
Gliding Arc Discharge ◽  
Gas Flow Rate ◽  
Gliding Arc ◽  
Discharge Gas ◽  
Gas Medium

Understanding breakdown phenomena in rotating gliding arc discharge (RGA) is of interest to tailor them for specific applications. This work revealed that the breakdown voltage in a RGA reactor was not dictated by collisional effects i.e., change in flow rate. The observation was consistent for both the discharge gas medium argon and nitrogen. The collisional effect variation was implemented by varying the operating flow rates i.e., 5 SLPM which is transitional in nature, and 50 SLPM which is turbulent in nature having localized micro-eddies. The observation also indicated failure of Paschen law in RGA having shortest gap between the electrodes of order of mm, operated under atmospheric pressure conditions. Collisional ineffectiveness indicates possibility of streamer formation which needs to be further investigated in future. This work marks preliminary and important step towards understanding the breakdown phenomena in atmospheric RGAs operated under different flow regimes such as laminar/transitional and turbulent.

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