Turbulence changes from magnetic fields in a stationary plasma

Alexander, A. B.; Raynor, C.T.; Wiggins, Delonia; Robinson, M. K.; Akpovo, Charlemagne; Johnson, J. A.

doi:10.1017/s0022377810000711

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…Therefore, it was necessary to have a special design for applying the DBD plasma to water treatment. Some studies have developed reactors by using DBD plasma for aqueous pollutant removal (Güçeri and Fridman 2007;Huang et al 2010Huang et al , 2012, and the turbulence changes of plasma were investigated when it was exposed to magnetic fields (Alexander et al 2011). Hybrid gas-liquid electrical discharge reactors were used for aqueous phenol degradation, formation of ·OH, H 2 O 2 , and O 3 was observed (Kusic et al 2005;Lukes et al 2004;Lukes and Locke 2005a, b;Sahni and Locke 2006).…”

Section: Introductionmentioning

confidence: 99%

Degradation of aqueous 3,4-dichloroaniline by a novel dielectric barrier discharge plasma reactor

Feng

Liu

Chen

et al. 2014

Environ Sci Pollut Res

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Degradation of aqueous 3,4-dichloroaniline (3,4-DCA) was conducted in a novel dielectric barrier discharge (DBD) plasma reactor. The factors affecting the degradation efficiency of 3,4-DCA and the degradation mechanism of 3,4-DCA were investigated. The experimental results indicated that the degradation efficiency of 3,4-DCA increased with increasing input power intensity, and the degradation of 3,4-DCA by the novel DBD plasma reactor fitted pseudo-first-order kinetics. Higher degradation efficiency of 3,4-DCA was observed in acidic conditions. The degradation efficiency of 3,4-DCA, the removal rate of total organic carbon (TOC), and the detected Cl(-) increased dramatically with adding Fe(2+) or Fe(3+). Degradation of 3,4-DCA could be accelerated or inhibited in the presence of H2O2 depending on the dosage. Several degradation intermediates of 3,4-DCA such as 1,2-dichlorobenzene, 2-chloro-1,4-benzoquinone, 3,4-dichlorophenyl isocyanate, 2-chlorohydroquinone, 3,4-dichloronitrobenzene, and 3,4-dichlorophenol were identified by gas chromatography mass spectrometry (GC-MS) analysis. Based on the identification of aromatic intermediates, acetic acid, formic acid, oxalic acid, and Cl(-) released, a possible mineralization pathway of 3,4-DCA was proposed.

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Section: Introductionmentioning

confidence: 99%

Degradation of aqueous 3,4-dichloroaniline by a novel dielectric barrier discharge plasma reactor

Feng

Liu

Chen

et al. 2014

Environ Sci Pollut Res

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“…1 and a diagram is shown in Ref. 11. The plasma is created in a quartz discharge tube 53.0 cm long with a 2.5 cm diameter, with an anode connected at one end and the cathode (tungsten grid, d ¼ 2.0 cm) and vacuum pump system connected on the other end.…”

Section: Experiments and Apparatusmentioning

confidence: 99%

“…5, decreases as the magnetic field increases and is in agreement with previous work. 11 The characteristic frequency in frequency space for each case during a magnetic field scan can be seen in Fig. 6.…”

Section: B Characteristic Frequencymentioning

confidence: 99%

“…10 With increasing magnetic field strength, parameters that describe the energy associated with turbulence and the characteristic instability modes decrease. 11 These parameters that characterize system turbulence have been used to describe fluctuations in many different types of plasmas and at many different time scales.…”

Section: Introductionmentioning

confidence: 99%

“…Previous work has been reported on the turbulent parameters of krypton 11 and argon 18 in glow discharge plasmas with applied magnetic fields. New measurements of these gases along with measurements of two new gases (neon and helium) create a novel data set to describe the turbulent parameters in terms of mass dependence.…”

Section: Introductionmentioning

confidence: 99%

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Mass dependency of turbulent parameters in stationary glow discharge plasmas

et al. 2013

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A direct current glow discharge tube is used to determine how mass changes the effects of certain turbulence characteristics in a weakly ionized gas. Helium, neon, argon, and krypton plasmas were created, and an axial magnetic field, varied from 0.0 to 550.0 Gauss, was used to enhance mass dependent properties of turbulence. From the power spectra of light emission variations associated with velocity fluctuations, determination of mass dependency on turbulent characteristic unstable modes, energy associated with turbulence, and the rate at which energy is transferred from scale to scale are measured. The magnetic field strength is found to be too weak to overcome particle diffusion to the walls to affect the turbulence in all four types of plasmas, though mass dependency is still detected. Though the total energy and the rate at which the energy moves between scales are mass invariant, the amplitude of the instability modes that characterize each plasma are dependent on mass. V C 2013 AIP Publishing LLC. [http://dx.

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The time evolution of turbulent parameters in reversed-field pinch plasmas

Titus

Alexander

Johnson

2013

Journal of Applied Physics

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Turbulence is abundant in fully ionized fusion plasmas, with unique turbulent characteristics in different phases of the discharge. Using Fourier and chaos-based techniques, a set of parameters have been developed to profile the time evolution of turbulence in high temperature, fusion plasmas, specifically in self-organized, reversed-field pinch plasma in the Madison Symmetric Torus. With constant density and plasma current, the turbulence profile is measured during ramp-up, magnetic reconnection, and increased confinement phases. During magnetic reconnection, a scan of plasma current is performed with a constant density. Analysis revealed that the energy associated with turbulence (turbulent energy) is found to increase when changes in magnetic energy occur and is correlated to edge ion temperatures. As the turbulent energy increases with increasing current, the rate at which this energy flow between scales (spectral index) and anti-persistence of the fluctuations increases (Hurst exponent). These turbulent parameters are then compared to the ramp-up phase and increased confinement regime.

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Turbulence changes from magnetic fields in a stationary plasma

Cited by 3 publications

References 9 publications

Degradation of aqueous 3,4-dichloroaniline by a novel dielectric barrier discharge plasma reactor

Degradation of aqueous 3,4-dichloroaniline by a novel dielectric barrier discharge plasma reactor

Mass dependency of turbulent parameters in stationary glow discharge plasmas

The time evolution of turbulent parameters in reversed-field pinch plasmas

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