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.

Numerical Modeling of Pit Growth in Microstructure

S. Qidwai[1], N. Kota[2], V. DeGiorgi[1]
[1]Naval Research Laboratory, Washington, DC, USA
[2]Science Applications International Corporation, Washington, DC, USA

Pitting corrosion is a complex phenomenon where rates of: i) chemical reactions, ii) diffusion of various species involve in those reactions, and iii) species dissolution at the metal-electrolyte interface are fully dependent on each other, except under special conditions or assumptions. One set of such conditions is that: a) there are no species concentration gradients due to the rapid mixing of ...

3D Temperature Distribution during Self-Propogating High-Temperature Synthesis of Advanced Ceramics

I. Selig[1], S. Lin[1], D.L. Cocke[1], and D. Luss[2]
[1] Lamar University
[2] University of Houston

Self-propagating High-temperature Synthesis (SHS) is an economical process to produce quality advanced ceramics. In this work, SHS of solid oxide fuel (SOFC) cathode materials was modeled using COMSOL Multiphysics.

Study of the Metastable Pitting of Stainless Steels by Computer Simulations

Malki, B., Baroux, B.
LTPCM/INPG Grenoble, France

Modelling of pit chemistry in applied polarization mode is carried out using finite element method techniques (FEM). The results lead to the formulation of critical conditions for pit stabilization in terms of pit geometry and applied potential. More detailed computing is performed to compare the stability behaviour of both ferritic AISI 430 and austenitic AISI 304 stainless steels. The ...

Improving Fuel Usage in Microchannel Based Fuel Cells

P. Fodor, and J. D'Alessandro
Dept. of Physics
Cleveland State University
Cleveland, OH

In this work a miniaturized fuel cell design based on microchannels, into which the liquid fuel and oxidizer streams are fed through T shaped connectors, is optimized for improved fuel usage. This particular design exploits the laminar nature of the fluid flow at small Reynolds numbers to keep the fuel and oxidizer confined in the vicinity of the corresponding electrodes without the need of a ...

A Fully Coupled Three-Dimensional Dynamic Model of Polymeric Membranes for Fuel Cells

P. Alotto[1], M. Guarnieri[1], and F. Moro[1]

[1]Dipartimento di Ingegneria Elettrica, Università di Padova, Padova, Italy

The proton exchange membrane is a key component in the currently widely studied Proton Exchange Membrane Fuel Cells. In this paper a fully coupled three-dimensional dynamic numerical model of the membrane including all the physically relevant phenomena, i.e. ion transport, hydration-dependent conductivity and thermal effects is presented. The highly non-linear model is discretized by means of the ...

Simulation of a Heated Tool System for Jet Electrochemical Machining

M. Hackert[1], G. Meichsner[2], and A. Schubert[1][2]

[1]Chair Micromanufacturing Technology, Faculty of Mechanical Engineering, Chemnitz University of Technology, Chemnitz, Germany
[2]Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany

Jet Electrochemical Machining (Jet-ECM) is an unconventional procedure using localized anodic dissolution for micromachining. An increasing of the electrolyte temperature will lead to an increase of the electrical conductivity of the electrolyte by about 30% and to a reduction of the dynamic viscosity of the electrolyte by about 25 %. Both will improve the process. Therefore a Jet-ECM tool system ...

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 ...

Constructing COMSOL Models of a Bacteriological Fuel Cell

R. Coker[1], J. Mansell[1]
[1]NASA - Marshall Space Flight Center, Huntsville, AL, USA

We have started constructing preliminary design COMSOL models of a bacteriologically driven \'fuel cell\' that is intended to process waste products, such as carbon dioxide and brine, from a crewed vehicle. At this early stage, this complex system is reduced to two electrodes separated by a membrane. The electrolyte is a brine appropriate for growing methanogenic bateria, though none are ...

Numerical Investigation on the Electrolyte (PBI/H3PO4) Management of a HT-PEM Fuel Cell

M. J. Hampe, S. Lang, H. Löhn, and T. Zeeden
Technische Universität Darmstadt
Fachgebiet Thermische Verfahrenstechnik
Darmstadt, Germany

PEM fuel cells based on Polybenzimidazole doped with phosphoric acid show many benefits in comparison to conventional perfluorinated sulfocationic membrane materials, but they suffer from a degradation partially caused by the loss of electrolyte. The first step to tackle this degradation problem is to understand the electrolyte management in high temperature PEMFCs. COMSOL 4.1 was used to ...

Modeling of Mass and Charge Transport in Li-ion Battery Electrolytes – the Impact of Ion Pairs

M. Mutke, and H.-D. Wiemhöfer
Institute of Inorganic and Analytical Chemistry
University of Muenster
Muenster, Germany

In this contribution, ionic mass and charge transport in Li-battery electrolytes is modeled. In particular, incomplete dissociation of the Li-salt, which is a common feature of many commercial electrolytes and which has so far been neglected in most electrolyte models, is considered. For electrolytes in cells under various charging/discharging conditions, the development of local concentration ...

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