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Iqbal M.M.,National Center for Plasma Science and TechnologyDublin City UniversityGlasnevin | Turner M.M.,National Center for Plasma Science and TechnologyDublin City UniversityGlasnevin
Plasma Processes and Polymers | Year: 2015

We developed a three-dimensional fluid model to investigate the evolution of filamentation during the breakdown phase in an atmospheric pressure DBD plasma. Filamentation is a major source of instability in DBD plasma and it develops frequently under distinct conditions. In this study, we explore the dynamic behavior of filaments under the influence of overvoltage and driving frequency. The filamentary profile of atmospheric pressure dielectric barrier discharge is suppressed in the breakdown phase when the frequency varies in the specified domain (2.5-25kHz) in He-N2 gas mixture. In particular, we contrast the spatial profiles of discharge parameters in the case of uniform and non-uniform discharge plasma. The trapping mechanism of electrons is identified only at higher frequencies (>50kHz) than small frequencies in the uniform DBD plasma. This simulation study describes the importance of three-dimensional modeling for the understanding of the filamentary and uniform discharge plasmas in the breakdown phase. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Iqbal M.M.,National Center for Plasma Science and TechnologyDublin City UniversityGlasnevin | Turner M.M.,National Center for Plasma Science and TechnologyDublin City UniversityGlasnevin
Plasma Processes and Polymers | Year: 2015

Interaction between the liquid precursor droplets and non-equilibrium atmospheric pressure plasma (APP) is identified as an important mechanism in two-phase flow. In this study, a two-dimensional integrated fluid-droplet model is developed to explore the behavior of this interaction under similar operating conditions of an experiment performed using PlasmaStream system. The evaporation of droplets is recognized as a primary mechanism in APP; however, the mutual interactions, such as grazing and coalescence between the droplets are dominant in the limit of higher precursor flow rates (>100μLmin-1). The spatio-temporal profiles of discharge plasma are contrasted by considering the effect of various liquid precursors, such as Hexamethyldisiloxane (HMDSO), nHexane, Tetraethyl orthosilicate and water in order to illustrate their significance during droplet-plasma interaction. In particular, we investigated the enhancement of evaporation of droplets by the increment of gas flow rates. Finally, the size distribution of HMDSO droplets measured with the experiment is compared with the results of the fluid-droplet model to provide the authenticity of numerical simulation outcomes. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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