Technical Papers and Presentations

Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquet des phénomènes électriques, mécaniques, fluidiques et chimiques. utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Plasma Edge Simulations by Finite Elements using COMSOL

C. Hollenstein, and A. Howling
Ecole Polytechnique Fédérale de Lausanne, Switzerland

Finite elements using COMSOL Multiphysics have been used to simulate the edge plasma in a large area capacitively coupled RF reactor. In order to reduce numerical difficulties simplified reactor edge geometries have been used. First results show the importance of electrostatic double layers within this plasma. In addition the non-uniform behaviour of the plasma sheath around convex and ...

Modeling of Microstructures in Dissimilar Copper/Stainless Steel Electron Beam Welds

I.Tomashchuk, P. Sallaman, and J.-M. Jouvard
Institut Carnot de Bourgogne, Université de Bourgogne, Le Creusot, France

In the case of electron beam welding of copper with stainless steel, two principal cases of welding pool morphology are possible: a droplet-like microstructure where the electron beam deviates to the copper side due to the thermoelectric effect, so the volume of molten copper is much bigger than steel, and an emulsion-like microstructure, volumes of melted materials are closely equal. Reproducing ...

Simulation of Dielectric Barrier Discharge Lamp Coupled to the External Electrical Circuit

A. El-Deib[1], F. Dawson[1], S. Bhosle[2], D. Buso[2], and G. Zissis[2]
[1]University of Toronto, Toronto, Ontario, Canada
[2]LAPLACE-University of Toulouse, Toulouse, France

This work uses COMSOL to simulate the Dielectric Barrier Discharge (DBD) lamp coupled to the external electrical circuit. The coupled system is modeled to capture the effect of the electrical parasitic elements on the efficiency of the DBD which is more realistic as compared to previous trials which assumed that a perfect voltage source is applied to lamp terminals. The obtained results ...

Stochastic Approach in Approximation of the Transient Plasma Sheath Behavior in FEM

J. Brcka
TEL US Holdings, Inc., Albany, NY, USA

Recently, the advanced plasma tools have been using very high frequency power sources (>100 MHz) and their combination to excite plasma utilized in semiconductor technology. This approach is evoking the regimes that are less understood and currently a subject to many studies and experimental investigations. The paper describes quasi-stochastic approach applied for sheath properties and ...

Finite Element Analysis of Ferrofluid Cooling of Heat Generating Devices

T. Strek
Institute of Applied Mechanics, Poznan University of Technology, Poznan, Poland

An external magnetic field imposed on a ferrofluid with a temperature gradient, results in a non-uniform magnetic body force, which leads to a form of heat transfer called thermomagnetic convection. A magnet placed near the device will always attract the colder ferrofluid more than warmer. Viscous, two-dimensional, laminar and incompressible ferromagnetic fluid flow, under the influence of a ...

Optics at the Nanoscale: Merging Nanoparticles with Light

Naomi Halas
Professor of Electrical and Computer Engineering, Chemistry and Bioengineering,
Rice University, Houston, TX, USA

Dr. Naomi Halas is currently Professor of Electrical and Computer Engineering, Chemistry, and Bioengineering at Rice University. She is the inventor of nanoshells, nanoparticles with optical resonances spanning the visible and infrared regions of the spectrum. She is co-founder of a company developing nanoshell-based cancer therapy. She is author of more than 150 refereed publications, more than ...

Investigation of Stability of Current Transfer to Thermionic Cathodes

M. Benilov, and M. Faria
Departamento de Física, Universidade da Madeira, Funchal, Portugal

Current transfer from high-pressure arc plasmas to thermionic cathodes may occur in a diffuse mode, when the current is distributed over the front surface of the cathode, or in a spot mode, when most of the current is localized in one or more small areas. Spectra of perturbations of 3D steady-state current transfer to thermionic cathodes of a high-pressure argon arc have been computed in the ...

Electric Field Distributions and Energy Transfer in Waveguide-Based Axial-Type Microwave Plasma Source

H. Nowakowska[1], M. Jasínski[1], and J. Mizeraczyk[1,2]
[1]The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Gdansk, Poland
[2]Dept. of Marine Electronics, Gdynia Maritime University, Gdynia, Poland

In this paper, we examine changes of the electric field distributions in waveguide-based axial-type microwave plasma source (MPS) during tuning procedure. The distributions strongly depend on position of the movable short, so does the wave reflection coefficient of the incident wave. A method of determining tuning characteristics of the MPS consisting in treating the MPS as a two-port network, ...

Ignition Process of Microplasmas

H. Porteanu, and R. Gesche
Ferdinand-Braun-Institut für Höchstfrequenztechnik, Berlin, Germany

Microplasmas at atmospheric pressure are required in many applications, where treatments in normal ambient, with spatial resolution, are important. The interest on such miniaturized sources has increased due to the availability of a new generation of microwave sources based on high power GaN transistors. The present work deals with a simulation of the plasma formation after the application of the ...

COMSOL Multiphysics Modeling of a 20-W Microwave Electrothermal Thruster

E. Gao, and S. Bilen
The Pennsylvania State University, University Park, PA, USA

The Microwave Electrothermal Thruster (MET) is a space electric propulsion device that uses an electromagnetic resonant cavity within which a free-floating plasma is ignited and sustained, heating a propellant gas that is that exhausted out of a gas-dynamic nozzle. For an empty cavity it is fairly straightforward to accurately calculate the cavity’s resonant frequency and describe the ...

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