科技论文和展示

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Heat and Mass Transfer Investigation in Fabrics

S. Quiniou[1], F. Lesage [1], V. Ventenat[2], and M.A. Latifi[1]
[1] Laboratoire des Sciences du Génie Chimique, Nancy
[2] Centre de recherche Décathlon, Villeneuve d’Ascq

In this paper, an investigation of heat and mass transfer in fabrics used in the manufacture of comfortable sportswear is presented. It is based on a model which is described by partial differential equations representing the mass balance of free and adsorbed water and vapour and the heat balance in the fabric. The model involves several unknown physical and transfer parameters. Two ...

Modelling of High Pressure Discharge Lamps

J-B. Rouffet, S. Bhosle, G. Zissis, and R. Ruscassié
Université Paul Sabatie, Toulouse

This paper presents the modeling of high pressure discharge lamps, which are complex molecular systems, using COMSOL Multiphysics. The model accounts for the momentum, mass and energy conservation equations.

From Numerical to Experimental Study of Microsystems for Dielectrophoresis on Bioparticles

P. Pham, I. Texier, and F. Perraut
CEA-LETI, Direction de la Recherche Technologique, Grenoble

This paper summarizes the numerical contribution to a project for the detection of bioparticles present in a small volume of a liquid sample. Dielectrophoresis (DEP) is used to enhance their transport toward the surface of a detector. The mathematical model is composed of the electrokinetics equation for the DEP force-field calculation, and the advection-diffusion equation for the particle ...

Crystallization Kinetics of Semi-Crystalline Polymers During Cooling

N. Brahmia[1], P. Bourgin[1], M. Boutaous[1], and D. Garcia[2]
[1] Laboratoire de Recherche Pluridisciplinaire en Plasturgie
[2] Pôle Européen de Plasturgie Belignat

Thermoplastic polymers are frequently used in several industries, and represent the most important group of polymeric materials. During the injection moulding process, the cooling phase including solidification is often the most significant part of the manufacturing cycle. In this paper we study the coupling phenomena between the crystallization and the thermal kinetics in the polymer ...

Analysis of the Electric Field and the Potential Distribution in Cavities Inside Solid Insulating Electrical Materials

T. Seghir[1], D. Mahi[1],T. Lebey[2], and D. Malec[2]
[1] Materials Laboratory, Electrical Engineering Institute, Amar Thelidji University of Laghouat, Algeria
[2] Electrical Engineering Laboratory, University of Paul Sabatier, Toulouse

Solid extruded polymeric materials such as crosslinked polyethylene are widely used in the electrical insulation of underground high voltage power transmission cables. This paper treats the combined effect of space charge and cavities, on the electric field, and potential and temperature distribution within the insulation. The model is a 3D stationary linear COMSOL Multiphysics model and the ...

Modeling of Drops Spreading on Patterned Surfaces

J. Frassy[1], C. Lécot[2], C. Delattre[3], and A. Soucemarianadin[1]
[1] LEGI UMR 5519, Grenoble
[2] LAMA UMR 5127, Le Bourget-du-Lac
[3] LETI, CEA Grenoble

We present simulations of drops spreading on heterogeneous surfaces. The droplet height is the solution of a time-dependent non-linear fourth order partial differential equation, which is solved using COMSOL Multiphysics. In the fully wetting case, we compare our results with experimental data and with previous results reported in the literature. The simulation results reveal how ...

Propagation of Crevice Corrosion by Numerical Modelling

A. Proust[1], G. Girardin[1], B. Vuillemin[2], P. Combrade[1], and R. Oltra[2]
[1] AREVA NP - Centre Technique - Département Corrosion-Chimie, Le Creusot
[2] Université de Bourgogne - Laboratoire de Recherche sur la Réactivité des Solides

The most common case of crevice corrosion occurs on passive materials such as stainless steels, in oxidizing-chloride environments. A flexible crevice propagation model has been developed to allow parametric studies of the solution. Our main results allow us to establish diagrams of stability of solid and gas phases within the crevice and to evaluate the influence of the external ...

Compressional Waves Generation in Droplets of Water Deposited on a Quartz Crystal

G. Couturier, R. Boisgard, C. Jai, and J.P. Aimé
Université Bordeaux

In this paper, we investigate the compressional wave generation in droplets and use different techniques to correlate the compressional wave generation to the shape of the droplets. Results show a good correlation between eigenmodes predicted by the theory and those experimentally observed.

Modelling of Heat and Mass Transfer During the Grilling and Roasting of Meat

A. Kondoyan, P-H. Bussière, and F. Verrier
INRA Clermont-Fd/Theix – Qualité des Produits Animaux – Equipe Couplage Transferts-Transformations

In this paper, we create models with the use of COMSOL Multiphysics to predict evolution of temperatures and crust formation in meat during barbecuing and oven roasting. Sensitivity to parameters is analysed and predictions are compared to experimental data from literature.

Modelling of Tissue Morphogenesis as the Resultant of Constitutive Cells Activities

L. Forest
Laboratoire Techniques de l'Imagerie, de la Modélisation et de la Cognition, Faculté de Médecine, Domaine de la Merci

The aim of this work is to study tissue morphogenesis as a consequence of the constitutive cells dynamics. Tissue morphogenesis is modelled as a cellular system coupled with a global chemical control. p> Two concrete examples are presented, the secondary growth of conifer trees and the epithelial invagination.

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