Numerical Investigation of Corona Plasma Region in Negative Wire-to-duct Corona Discharge

Kim, C.; Noh, Kwang-Chul; Hwang, Jungho

doi:10.4209/aaqr.2010.03.0019

Cited by 24 publications

(16 citation statements)

References 16 publications

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“…1C) with a length of 30 cm and a diameter of 6 mm, which induced a fully developed flow and minimize the entrance effect at the nozzle (Re = 700). The nozzle filet had a finite radius of curvature (2 mm) at the tip so that the electric field applied to this tip was minimized [39]. After the charged CNTs were ejected from the nozzle, they were guided by electrical force to deposit on a substrate located on an electrode to which a high voltage was applied.…”

Section: Cnt Filter Fabricationmentioning

confidence: 99%

Filtration and inactivation of aerosolized bacteriophage MS2 by a CNT air filter fabricated using electro-aerodynamic deposition

Park

Hwang

2014

Carbon

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A B S T R A C TCarbon nanotubes (CNTs) were coated on a sample of glass fiber air filter medium at atmospheric pressure and room temperature using electro-aerodynamic deposition (EAD). In the EAD method, CNTs (diameter: 50 nm, length: 2-3 lm) were aerosolized, electrically charged, and injected through a nozzle. A voltage was applied externally between the ground nozzle and a planar electrode on which the sample was located. The charged CNTs were deposited on the sample in a vertically standing posture even at a low flow velocity. Before the deposition experiment, a calculation was performed to determine the applied voltage by simulating the electric field, flow field, and particle trajectory. Using CNT-coated filter samples, virus aerosol filtration and anti-viral tests were carried out using the aerosol number counting method and the plaque counting method, respectively. For this purpose, bacteriophage MS2 was aerosolized with an atomizer. The particle filtration efficiency was increased to 33.3% in the most penetration particle size zone (100 nm) and the antiviral efficiency of the CNT filter was 92% when the coating areal density was 1.5 · 10 9 #/cm 2 . The susceptibility constant of virus to CNTs was 0.2 cm 2 /lg. (J. Hwang). C A R B O N 7 5 ( 2 0 1 4 ) 4 0 1 -4 1 0 A v ai l abl e a t w w w . s c i e n c e d i r e c t. c o m ScienceDirect j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / c a r b o n

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Section: Cnt Filter Fabricationmentioning

confidence: 99%

Filtration and inactivation of aerosolized bacteriophage MS2 by a CNT air filter fabricated using electro-aerodynamic deposition

Park

Hwang

2014

Carbon

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“…The air ions are ultimately further generated through lightning from thunder cloud, corona discharge, combustion, waterfall, waves on water, splashing of rain drops and due to friction between two air levels depending on the nature of the ecosystems and local atmosphere (Israël, 1970). Kim et al (2010) have presented a numerical model of corona plasma region having a certain thickness was developed to solve the electric field and charge density distributions in a negative wire-to-duct corona discharge in air.…”

Section: Introductionmentioning

confidence: 99%

Air Ion Variation at Poultry-farm, Coastal, Mountain, Rural and Urban Sites in India

Pawar¹,

Meena

Jadhav

2012

Aerosol Air Qual. Res.

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The air ions are continuously generated and destroyed by various processes in the atmosphere. Near the surface, the nature of ions is very complex and they show large variations in their physical properties. The attachment of small ions to the aerosol particles is depending on the mobility of air ions. High mobility air ions immediately are attached to the aerosol particles and settle down on the surface. In this study we report, about the air ion variation at different sites like Rural, Coastal, Mountain, Poultry farm and urban in the state of Maharashtra in India. The aim of this study is to understand the plausible distribution of air ions both diurnally and at different times in a day for long time (three years) and with various meteorological variables. The preliminary analysis of the data has reveled that negative air ions are observed to have attached to the aerosol particles and large aerosol particles are formed from small aerosol particles. Therefore uni-polarity factor observed to be below unity for coastal, mountain and rural site and about 2.8 at an urban site. However worst case is observed at the Poultry farm, where uni-polarity factor is 6.3, which is very harmful for human health. There is also effect of meteorological parameters on air ion concentration in the atmosphere.

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“…Thus, the application of combining atmospheric plasma technology and enzyme scrubbing has a high potential for practical application. In 2010, Kim et al (2010) studied numerical investigation of corona plasma region in negative wire-to-duct corona discharge. In their article, a novel computation method calculating the plasma region thickness was presented with the plasma region model.…”

Section: (7) Difference In Conversions Between Dimethyl Sulfide and Mmentioning

confidence: 99%

Decomposition of Methyl Tert-Butyl Ether by Adding Hydrogen in a Cold Plasma Reactor

Hsieh

Tsai

Chang

et al. 2011

Aerosol Air Qual. Res.

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Methyl tert-butyl ether (MTBE) is extensively used as an oxygenate and octane enhancer in gasoline. Its release to the environment has generated great public and governmental concern. In this study, we give a brief review of the decomposition of air toxics by the application of radio frequency (RF) plasma reactors and then present our study on decomposition of methyl tert-butyl ether by adding hydrogen in a cold plasma reactor. Based on our references, there are four types of the application in the RF plasma reactors are discussed, including: (i) Application I.: Converting methane, decomposing carbon dioxide, ethoxyethane, and ethylene oxide; (ii) Application II.: Decomposing methyl chloride, 1,1-C 2 H 2 Cl 2 , and CH 2 Cl 2 ; (iii) Application III.: Decomposing dichlorodifluoromethane, CHF 3 , CH 2 F 2 , CCl 2 F 2 , and BF 3 ; (iv) Application IV.: Decomposing dichlorodifluoromethane, CH 3 SH, CS 2 , SF 6 , and SF 6 + H 2 S mixture. Moreover, this study demonstrates the feasibility of applying a radio frequency (RF) plasma reactor for decomposing and converting MTBE. Experimental results indicate that the decomposition efficiency (η MTBE ) and the fraction of total input carbon converted into CH 4 , C 2 H 2 and C 2 H 4 (F CH4+C2H2+ C2H4 ) increased with the input power and decreased as both the H 2 /MTBE ratio and the MTBE influent concentration in the MTBE/H 2 /Ar plasma environment increased. Interestingly, applying radio frequency plasma to the decomposition of MTBE while adding hydrogen constitutes alternative method of decomposing and converting MTBE into CH 4 , C 2 H 4 , C 2 H 2, iso-butane and iso-butene.

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Numerical Investigation of Corona Plasma Region in Negative Wire-to-duct Corona Discharge

Cited by 24 publications

References 16 publications

Filtration and inactivation of aerosolized bacteriophage MS2 by a CNT air filter fabricated using electro-aerodynamic deposition

Filtration and inactivation of aerosolized bacteriophage MS2 by a CNT air filter fabricated using electro-aerodynamic deposition

Air Ion Variation at Poultry-farm, Coastal, Mountain, Rural and Urban Sites in India

Decomposition of Methyl Tert-Butyl Ether by Adding Hydrogen in a Cold Plasma Reactor

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