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 impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Design of heat flux microsensor assisted by COMSOL for the study of energy transfer on Si and Cu thin samples

L. Bedra, N. Semmar, A.-L. Thomann, R. Dussart, J. Mathias, and Y. Tessier
GREMI, CNRS-Université d'Orléans, Orléans, France

A commercial heat probe is used for energy transfer measurements on copper and silicon substrates. To do so, the micro sensor has to be calibrated under high vacuum (~10-7 mbar), using a homemade black body as a heat source.Although the HFM is cooled at 5 oC, the solid surface temperature is unknown as the thermal contact resistance. Thus, COMSOL simulations are also used to obtain reliable ...

A non-Conventional use of COMSOL to Solve a Complex 3D Geometrical Problem

J. P. Caire, and F. Jomard
LEPMI, ENSEEG, Saint Martin d'Hères, France

The purpose of this study was the optimization of an industrial furnace from a thermal point of view. Such a cylindrical furnace contains an Al-Mg molten alloy covered by a KCl-NaCl molten salt layer floating on it to prevent alloy evaporation. When tilting the cylindrical furnace, it was necessary to compute the relation between the salt and alloy volumes and the area of the liquid alloy/salt ...

Vibratory Study of the Soundboard of a Piano

P. Olivier, and J. Alenda
Enseeiht, Toulouse, France

In this presentation, we present our work on the vibratory study of the soundboard of a piano. Material parameters as well as thickness of the material is studied in detail.

The Use of COMSOL to Solve Hygrothermal Building Physical Problems Related to Insulating High-rise Building Facades

H. L. Schellen, A. W. M. van Schijndel, and E. Neuhaus

In the Netherlands, high-rise buildings from 1960 and before were hardly insulated. To improve the thermal performance of these buildings, the facades may be retrofitted with insulating material. Energy losses will be reduced and thermal comfort will be improved by higher indoor surface temperatures. Problems, however, may be introduced by thermal bridge effects of anchors, floors and indoor ...

Cross Method of Nanoscale Modeling and Macroscopic Data to Estimate Anion Effective Diffusion Coefficient in Argillite

N. Diaz1, F. Goutelard1, and P.Turq2
1CEA/DEN/DPC/SECR/L3MR, CEN Saclay, Gif-sur-Yvette, France
2LI2C, Université Pierre et Marie Curie, Paris, France

Based on a mechanistical understanding of solute migration in pure clay at nanometric scale, a model has been developed to evaluate the effective diffusion coefficient De in clay-rocks at the centimetre scale from the description of the mineralogy (and its heterogeneity) of the rock at the micrometer scale.

Numerical Simulation of the Heat Transfer to Suspensions of Microencapsulated Phase Change Material (MEPCM)

F. Dammel, and P. Stephan
Technische Universität, Darmstadt, Darmstadt, Germany

The addition of microencapsulated phase change material particles can improve the characteristics of a heat transfer fluid. The numerical simulation of the heat transfer to such MEPCM suspensions with COMSOL Multiphysics is the subject of this contribution. The suspensions are treated as homogeneous liquids with appropriate models for viscosity, thermal conductivity and, most important, specific ...

Electro-Mechanical Modeling of Excitable Soft Tissues

Luciano Teresi
Assistant Professor
School of Engineering
Università "Roma Tre"
Rome, Italy

Cardiac muscle exists in two forms: the contractile myocardium and specialized conducting cells that spread the wave of depolarization throughout the chambers of the heart. Action potentials are initiated in the sinoatrial (SA) node, which serve as the “pacemaker” of the heart. In this presentation, this is investigated thoroughly with different examples and simulated results of ...

Modeling Solute in Clays at the Nanometric Scale Part I. Application to the Alcaline Series

N. Diaz1, F. Goutelard1, and P.Turq2
1CEA/DEN/DPC/SECR/L3MR, CEN Saclay, Gif-sur-Yvette, France
2LI2C, Université Pierre et Marie Curie, Paris, France

The argillite formation has been proposed as a potential host rock for deep radioactive waste disposal. These materials have very low permeability and diffusion is likely to be the predominant transfer mechanism for solute migration.The negatively charged surface of the clays induces unexpected behaviour of the ions: while the anions diffuse slower than HTO, the transport of the cations is ...

3D Finite Element Models of Ground Deformation and Stress Field in a Viscoelastic Medium

D. Scandura1,2, G. Currenti1, and C. Del Negro1
1Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Catania, Italy
2Dipartimento di Matematica e Informatica, Università di Catania, Catania, Italy

A 3D finite element model was used to evaluate the time dependent ground deformation and the stress change caused by a pressure source embedded in a viscoelastic medium. In volcanic areas, the presence of inhomo-geneous materials and high temperatures produce a lower effective viscosity of the Earth's crust which calls for consideration of the thermal regime of crustal volume surrounding the ...

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