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.

Modeling the Rheology of Liquid Detergents

Vincenzo Guida
R&D Process Design Principal Engineer, Procter & Gamble, Italy

Outline of presentation: Comsol is a very flexible platform, ideal to model rheology modification under flow Analogy with reactive flows allows modeling of both thixotropy and gelation with decent level of accuracy and predictability It is possible, to a certain extent, to use 1D rheology to extrapolate 3D behavior ---------------------------------- Keynote speaker's biography:Vincenzo ...

Numerical Study of an LTD Stirling Engine with Porous Regenerator

N. Martaj[1], P. Rochelle[1][2], L. Grosu[1], R. Bennacer[3], and S. Savarese[4]
[1]Universitè de Paris, Paris, France
[2]Institut Jean Le Rond d'Alembert, Université Paris 6
[3]Laboratoire LEEVAM «Environnement, Energétique, Valorisation, Matériaux», Universitéde Cergy-Pontoise
[4]COMSOL France, 5 pl. R Schuman, 38000 Grenoble

The alternative engines of Stirling type, are engines running on "hot air", using both an external heat source and regeneration. They should be considered as an alternative for the effective conversion of renewable energy sources into work, with their theoretical yield equal to the theoretical Carnot limit. The output efficiency and the power of these engines are strongly related to the ...

A Multiscale Numerical Model of a Deformable Isothermal Nonwetting Liquid Drop

Smith, M.K., Neitzel, G.P.
The George W. Woodruff School of Mechanical Engineering, Georgia Institue of Technology, Atlanta, GA

A state of permanent, isothermal nonwetting of a solid surface by a normally wetting liquid may be achieved by having the surface move tangentially to a liquid drop that is pressed against it. Surrounding gas is swept into the space between the liquid and solid creating a lubricating film that prevents wetting. The length scales of the drop and the film are typically three or more orders of ...

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 ...

Heat Transfer During a CW Laser Crystallisation Process of a Silicon Thin Film on a Glass Substrate

Bourouga, B.1, Le Meur, G.1, Garnier, B.1, Michaud, J.F.2, Mohammed-Brahim, T.2
1 Laboratoire de Thermocinétique de Nantes
2 IETR – Groupe de Microélectronique-Université Rennes I

Development of new handling microsystems needs integration of field effect thin film transistors made directly on various low temperature substrates, as glass for example, with other functions. Argon laser is used to melt completely and then to crystallize 400 nm thick amorphous silicon films. However, the implementation of this process generates cracking and destruction of the silicon thin film ...

Two-fluid modelling of an abnormal low-pressure glow discharge

Low-pressure glow discharges are of topical interest for a lot of technological applications like plasma light sources, plasma processing for surface modification, and plasma chemistry. Therefore, a detailed understanding of the fundamental processes of glow discharges is required to e.g. optimize the discharge parameters in these plasma applications. Theoretical investigations can help to ...

Modélisation d'une décharge luminescente à la pression atmosphérique

Cormier, J.M., Semmar, N., Ouni, M.F.
GREMI, UMR 6606, Orléans

Les décharges luminescentes à pression atmosphérique sont étudiées expérimentalement en laboratoire pour la valorisation des alcanes et notamment la production d'hydrogène à partir du méthane. La modélisation des dispositifs usuels est complexe compte tenu de l'aspect non stationnaire des décharges. Afin d'évaluer le poids des paramètres de réglage d'un réacteur nous avons ...

Computations of the earth’s and other solar planets’ magnetic moments with the aid of a FEMLAB electromagnetic module

Wada, J.Y.
Retired, Hughes Space & Communications Co. (Now Boeing Co.)

Computations have been performed of Earth’s and other solar planets’ magnetic moments with the aid of a FEMLAB Electromagnetic Module. The FEMLAB library has a specific program that calculates magnetic field strength and distribution resulting from a circular current source. This program has been adapted with 38 concentric loops to simulate the conductive currents circulating within the ...

Energy Transformation Damping

G.S. Mulder[1]
[1]Leiden, The Netherlands

A model for material damping is presented in terms of internal friction and in terms of a variation of stiffness. In the latter case the idea is that the stiffness increases if elastic energy is stored and decreases if elastic energy is released. In case of a single mass spring system “stiffness” refers to the stiffness of the spring; in case of a continues object ...

Chaotic Behavior of the Airflow in a Ventilated Room

A.W.M. van Schijndel[1]
[1]Eindhoven University of Technology, Eindhoven, The Netherlands

Chaotic systems may lead to instability, extreme sensitivity and performance reduction. Therefore it is unwanted in many cases. Due to these undesirable characteristics of chaos in practical systems, it is important to recognize such a chaotic behavior. The existence of chaos has been discovered in several areas during the last 30 years. However, there is a lack of studies in relation with ...

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