Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Symmetric Stack Model of a Molten Carbonate Fuel Cell (MCFC) with Indirect Reforming

M. Pfafferodt[1], P. Heidebrecht[2], and K. Sundmacher[1,2]
[1]Otto-von-Guericke-University, Magdeburg, Germany
[2]Max-Planck-Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany

A model of a Molten Carbonate Fuel Cell (MCFC) stack with internal reforming is presented.  It describes the concentrations in the gas phase, the temperatures and the current densities in this highly integrated system. The differential equations, boundary conditions and the coupling equations used in the model are presented. A strategy to solve the system of partial differential ...

Multiple Solutions in the Theory of DC Glow Discharges

P. Almeida, and M. Benilov
Departamento de Física. Universidade da Madeira, Portugal

It was suggested long ago that a theoretical model of a near-cathode region in a DC glow discharge admits multiple steady-state solutions describing different modes of currrent transfer. Even the most simple self-consistent models should admit such multiple solutions. In the present work, these solutions have been calculated for the first time with COMSOL Multiphysics.

Fluidmechanical Damping Analysis of Resonant Micromirrors with Out-of-plane Comb Drive

T. Klose[1], H. Conrad[2], T. Sandner[1], and H. Schenk[1]

[1]Fraunhofer Institute Photonic Microsystems (FhG-IPMS), Germany
[2]TU Dresden, Semiconductor and Microsystems Technology Laboratory, Germany

Damping is the liminting factor for the reachable maximum deflection. Thus, it is a very important issue for resonant microsystems. In this paper, we present a damping model for out-of-plane comb driven resonant micromirrors. The basic concept of this model is to attribute viscous damping in the comb gaps as the dominant contributor of damping moments. The model is extended by findings from a ...

Micro Cooling of SQUID Sensor

B. Ottosson[1], Y. Jouahri[2], C. Rusu[1], and P. Enoksson[2]
[1]Imego AB, Gothenburg, Sweden
[2]Chalmers University of Technology, Gothenburg, Sweden

The objective of this work has been to realize a feasibility study of a cooling device for a SQUID sensor using liquid nitrogen flowing through micro channels. The design consists of an epoxy cylindrical vacuum vessel skewed by a silicon microchannel heat sink. The SQUID sensor is situated directly on top of the microchannel heat sink. The device is used at room temperature and should be able to ...

Desorption Simulation of a Highly Dynamic Metal Hydride Storage System

D. Wenger[1], W. Polifke[2], and E. Schmidt-Ihn[3]
[1]Wenger Engineering GmbH, Ulm, Germany
[2]Technical University of Munich, Munich, Germany
[3]Daimler AG, Kirchheim/Teck, Germany

Metal hydrides are a widely-used method for storing and releasing hydrogen chemically under moderate conditions. This paper will present how highly dynamic metal hydride storage has been simulated and optimized using COMSOL Multiphysics. It will be shown how mass, energy and momentum balances were implemented and what boundary conditions were set to resolve various scenarios. The result of the ...

Numerical Analysis of the Impact of Geometric Shape Patterns on the Performance of Miniaturized Chromatography Systems

R. Winz[1], E. von Lieres[2], and W. Wiechert[1]
[1]Department of Simulation, University of Siegen, Siegen, Germany
[2]Institute of Biotechnology, Research Centre Jülich, Siegen, Germany

We have implemented a two dimensional chromatography model for the analysis and optimization of structured micro pillar arrays. Dynamic surface interaction of solved molecules is taken into account by the kinetic Langmuir model. Variations of the pillar array geometry lead to deviations in the outlet concentration profiles. These deviations cannot be described by the one dimensional models that ...

Comparison between COMSOL and RFSP-IST for a 2-D Benchmark Problem

G. Gomes
Atomic Energy of Canada Limited, Mississauga, Ontario, Canada

RFSP-IST (Reactor Fueling Simulation Program) is a computer code used for the full-core neutronics design and analysis of CANDU® reactors. RFSP-IST calculates the static flux and power distributions in the core by solving the neutron diffusion equation in two energy groups. For validation purposes, results from RFSP-IST are often compared with those from other codes. This paper documents the ...

Study of a Self Heating Process of Tetrafluoroethylene by the Exothermic Dimerization Reaction to Octafluorocyclobutane

M. Beckmann-Kluge[1], H. Krause[1], V. Schröder[1], A. Acikalin[2], and J. Steinbach[2]
[1]Federal Institute for Materials Research and Testing, Berlin, Germany
[2]Technical University Berlin, Berlin, Germany

The self heating process of Tetrafluoroethylene caused by an exothermic dimerization reaction was studied. The heat of reaction can lead to a thermal explosion by the decomposition of the Tetrafluoroethylene. Different reaction kinetics, including multistep kinetics, were used to describe the mass balance. The COMSOL Chemical Engineering Module was used to perform the simulation which was ...

Simulation of Current Collector Corrosion Effects on the Efficiency of Molten Carbonate Fuel Cells

I. Sgura[1], F. Zarcone[2], and B. Bozzini[2]
[1]Dipartimento di Matematica, Università del Salento, Lecce, Italy
[2]Brindisi Fuel Cell Durability Laboratory, Facoltà di Ingegneria Industriale, Università del Salento, Brindisi, Italy

Corrosion and contact ohmic resistance of the stainless steel current collectors in molten carbonates is one of the greatest obstacles to widespread application of molten carbonate fuel cells (MCFC). We simulate the variation of material parameters values, accounting for the impact of corrosion of the metallic current collectors on the performance of the porous cathode. Furthermore, we couple a ...

Computation of Three-Dimensional Electromagnetic Fields for an Augmented Reality Environment

A. Buchau, and W. Rucker
Institut für Theorie der Elektrotechnik, Universität Stuttgart, Germany

Augmented reality is predestined for visualization of electromagnetic fields in air or inside transparent matter. Real existing objects are studied and invisible electromagnetic fields are added as virtual objects. Hence, experts as well as students are able to connect electromagnetic fields easily with studied objects. They can concentrate on physical effects instead on reading figures. Here, an ...

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