Elementary Chemical and Physical Phenomena in Electrical Discharge Plasma in Gas–Liquid Environments and in Liquids

Locke, Bruce R.; Lukeš, Petr; Brisset, Jean‐Louis

doi:10.1002/9783527649525.ch6

Cited by 55 publications

(46 citation statements)

References 298 publications

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“…16) runs through blocks 1 to 6 around the core of plasma fundamentals 7 [118]. Within the framework, the EP process 1 comprises the subsystems shown in the phenomenological model structure (Fig.…”

Section: Regression Modelling and Design Of Experiments 22mentioning

confidence: 99%

Towards smart electrolytic plasma technologies: An overview of methodological approaches to process modelling

Парфенов

Yerokhin

Nev’yantseva

et al. 2015

Surface and Coatings Technology

158

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Article:Parfenov, E.V., Yerokhin, A., Nevyantseva, R. ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract This paper reviews the present understanding of electrolytic plasma processes (EPPs) and approaches to their modelling. Based on the EPP type, characteristics and classification, it presents a generalised phenomenological model as the most appropriate one from the process diagnostics and control point of view. The model describes the system 'power supply -electrolyser -electrode surface' as a system with lumped parameters characterising integral properties of the surface layer and integral parameters of the EPP. The complexity of EPPs does not allow the drawing of a set of differential equations describing the treatment, although a model can be formalised for a particular process as a black box regression. Evaluation of dynamic properties reveals the multiscale nature of electrolytic plasma processes, which can be described by three time constants separated by 2-3 orders of magnitude (minutes, seconds and milliseconds), corresponding to different groups of characteristics in the model. Further developments based on the phenomenological approach and providing deeper insights into EPPs are proposed using frequency response methodology and electromagnetic field modelling. Examples demonstrating the efficiency of the proposed approach are supplied for EPP modelling with static and dynamic neural networks, frequency response evaluations and electromagnetic field calculations.

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Section: Regression Modelling and Design Of Experiments 22mentioning

confidence: 99%

Towards smart electrolytic plasma technologies: An overview of methodological approaches to process modelling

Парфенов

Yerokhin

Nev’yantseva

et al. 2015

Surface and Coatings Technology

158

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“…Gas–liquid (water) discharges are of great interest to efficiently produce hydroxyl radicals, • OH, that in turn form hydrogen peroxide, H 2 O 2 , or that oxidize many organic compounds . A variety of means to contact plasma with liquid water have been investigated including cases where the plasma propagates along the interface of a gas–liquid system .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Electrical Discharge Plasma in a Gas‐Liquid Flow Reactor Using Optical Emission Spectroscopy and the Formation of Hydrogen Peroxide

Hsieh

Wang

Locke

2016

Plasma Process. Polym.

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Optical emission spectroscopy was used to characterize an electrical discharge plasma reactor with a liquid H 2 O film contacting different carrier gases. The plasma gas temperatures for Ar, He, and 1% N 2 in Ar were 1000-1200 K and did not vary significantly with liquid flow rate. Increasing solution conductivity by adding KCl to deionized water in the Ar case lowered the temperature by 13%, increased the discharge power and lowered the H 2 O 2 formation rates. The temperature was highest in the case of air (2400 K), and in the case of Ar the temperature increased with the addition of O 2 . The temperatures for this reactor are comparable to previous studies with discharges in humid gases, while the effects of liquid conductivity were similar to those reported with direct discharge in the liquid phase.

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“…Although the breakdown parameters are substantially influenced by electrolyte concentration in the solution (i.e. by solution conductivity), they seem to be independent on the electrolyte kind itself [9,19] (the comparison is given for NaCl, NaNO 3 , Na 2 SO 4 and Na 3 PO 4 electrolyte solutions). On the other hand, the process of bubble formation in the DC regime is affected by both electrolyte kind as well as its concentration [19].…”

Section: Resultsmentioning

confidence: 99%

“…Our paper is focused on results obtained in the diaphragm configuration however our further experiments are dealing with the transition between the diaphragm and capillary configuration and these results will be submitted for publication in another paper soon. Typically, DC or low frequency (50 Hz) high voltage sources are used in a pulsed or continuous regime [9]. Two of initiated processes, electrolysis and Joule heating, induce a decrease of energy efficiency of such systems [10].…”

Section: Introductionmentioning

confidence: 99%

Generation of High Frequency Pin-hole Discharge in Water Solutions

2014

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This paper presents results on electric discharge generation by high frequency high voltage (15-100 kHz) in NaCl solutions with different initial conductivity (100-1300 mS cm -1 ), and compares them with DC discharge in the same electrode configuration. A batch plasma reactor in the pin-hole configuration contained a ceramic dielectric barrier separating two planar stainless steel electrodes; barrier thickness of 0.6 mm and pin-hole diameter of 0.6 mm was used. Lissajous charts were evaluated from electric measurements for different discharge phases (electrolysis, bubble formation and discharge regular operation). Breakdown moments for different solution conductivities were determined from discharge power evaluation as a function of applied frequency. Breakdown voltage amplitude was decreased by the increasing conductivity in both regimes while frequency and current decreased. Changes of physical parameters (temperature, solution conductivity and pH) as well as production of hydrogen peroxide at different solution conductivities were compared. Solution conductivity was increased in both discharge regimes and with the initial conductivity value. Solution temperature was increased by the discharge in both regimes and with the increasing initial conductivity, too. Solution pH dropped to acidic conditions when HF or DC positive regime was applied while it was enhanced by DC negative regime.

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Elementary Chemical and Physical Phenomena in Electrical Discharge Plasma in Gas–Liquid Environments and in Liquids

Cited by 55 publications

References 298 publications

Towards smart electrolytic plasma technologies: An overview of methodological approaches to process modelling

Towards smart electrolytic plasma technologies: An overview of methodological approaches to process modelling

Analysis of Electrical Discharge Plasma in a Gas‐Liquid Flow Reactor Using Optical Emission Spectroscopy and the Formation of Hydrogen Peroxide

Generation of High Frequency Pin-hole Discharge in Water Solutions

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