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Investigating plasma jets Behavior using Axisymmetric Lattice Boltzmann Model under Temperature Dependent Viscosity

Communications in Computational Physics 2014年第3期15卷 677-691页

作者： Ridha Djebali ISLAIB–Beja 9000 University of JendoubaTunisia

This study aims to investigate turbulent plasma flow using the lattice Boltzmann(LB)method.A double population model D2Q9-D2Q4 is employed to calculate the plasma velocity and temperature fields.Along with the calculation process a conversion procedure is made between the LB and the physical unit systems,so that thermo-physical properties variation is fully accounted for and the convergence is checked in physical space.The configuration domain and the boundary condition treatment are selected based on the most cited studies in order to illustrate a realistic situation.The jet morphology analysis gives credible results by comparison with commonly published works.It was demonstrated also that accounting for the substrate as wall boundary condition modify greatly the flow and temperature structures with may affect absolutely the particles behavior during its in-flight in the hot gas.

关键词： LB method axisymmetric model temperature dependent viscosity turbulence plasma jets

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Some Advances in Applications of Lattice Boltzmann Method for Complex Thermal Flows

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 587-608页

作者： Ridha Djebali Habib Sammouda Mohammed El Ganaoui University of Tunis El-Manar FS of TunisDepartment of PhysicsLETTM1060 TunisTunisia CNRS/SPCTS UMR 6638FST of LimogesDepartment of Physics87060 LimogesFrance

Over the past two decades,there have been enormous advances in lattice Boltzmann(LB)numerical simulation and modelling.The lattice Boltzmann method has become a practical and promising tool for many fluid problems.A majority of recent studies have relied on numerical computations of isothermal flows.However,much less efforts have been devoted to complex thermal flows,such as flows in porous media subjected to external magnetic force,flows with temperature-dependent properties.In this paper,an overview is made based on some accomplishments in these numerical endeavours.Along with the paper’s sections,the state-of-the-art trend and the LBM advances in modelling and in computational aspects for specific classes of problems of major interest will be fully touched on.Concluding remarks are given and the axis of our future studies will be traced.

关键词： LB method Bifurcations and instability porous media flows plasma jets

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Surface Characterization of Helium plasma Treated Nano-SiO2 Sol-gel Coating UHMWPE Filaments by Contact Angle Experiments and ATR-FTIR

Surface Characterization of Helium Plasma Treated Nano-SiO2 ...

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绿色纺织，健康生活——第三届纺织生物工程及信息学国际会...

作者： Ying-Chen Zhang1 2 Jian-Xin He1 Hong-Yan Wu1 Yi-Ping Qiu2 1Zhongyuan University of Technology Zhengzhou 450007 China 2Engineering Research Center of Textile Technical Education Ministry Donghua University Shanghai 201620 China

Ultrahigh molecular weight polyethylene （UHMWPE） Filaments has a low surface free energy and therefore a modification of their surface properties before any use is often needed. Atmospheric pressure plasmas treatment is a convenient and environment friendly way to obtain these modifications by introducing new chemical groups at the surface without affecting the bulk properties. This paper studies the influence of nano-SiO2 Sol-gel coating pretreatment on atmospheric pressure jet （APPJ） treatment of UHMWPE fibers with helium used as the treatment gas. The surface properties of the plasma-treated UHMWPE Filaments are characterized using contact angle measurements and ATR-FTIR spectroscopy. The UHMWPE Filaments show a remarkable increase in surface free energy after plasma treatment. ATR-FTIR spectroscopy of the plasma-treated UHMWPE Filaments reveals that plasma treatment introduces oxygen-containing functionalities, such as ketones, aldehydes, alcohols and carboxylic acids on the UHMWPE Filaments surface leading to the increased surface free energy.

关键词： plasma jets UHMWPE contact angle fourier transform infrared spectroscopy

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MODELING OF CHEMICAL KINETICS IN plasmaS CONTAINING OXYGEN

MODELING OF CHEMICAL KINETICS IN PLASMAS CONTAINING OXYGEN

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： T Ibehej R Hrach V Hrachova Charles University Faculty of Mathematics and PhysicsDepartment of Surface and Plasma ScienceV Holesovickach 218000 Prague 8Czech Republic

ISBN: (纸本)9771003651221

A mixture of Ar and O glow discharge plasma is investigated by means of chemical kinetics. Using a Boltzmann solver and a kinetic model of 152 chemical reactions,we described the effects of different initial density ratio[Ar]:[O].The importance of individual reactions in different periods of discharge ignition was determined using differential weight factor.

关键词： reaction kinetics Modeling oxygen plasmas kinetic model Argon WEIGHTING FACTORS plasma jets

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THREE-DIMENSIONAL NUMERICAL ANALYSIS OF ROTARY ARC plasma DURING CURRENT INTERRUPTION PROCESS

THREE-DIMENSIONAL NUMERICAL ANALYSIS OF ROTARY ARC PLASMA DU...

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： S.Hirayama T.Fujino M.Ishikawa T.Mori K.Iwamoto H.Kawano University of Tsukuba Japan Toshiba Corporation Japan

ISBN: (纸本)9771003651221

＜正＞Three-dimensional unsteady numerical analysis is carried out to examine the relationship between the arc voltage and the behaviour of rotary arc plasma in an experimental chamber during the current interruption process. Numerical results successfully reproduce the extinction peaks of arc voltage near the current zero point observed in the experiment.The peak is caused by cooling effect of the rotary arc.

关键词： arc voltage interruption Cooling effects Blood plasma plasmas currents electric current plasma jets plasma zero point aluminium current interruption current zero arcs

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