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.

Computational Building Physics using COMSOL Multiphysics

A.W.M. van Schijndel
Technische Universiteit Eindhoven

This paper presents a first modeling guide for the modeling and simulation of Heat, Air & Moisture (HAM) transport of building constructions using COMSOL with Matlab. The aim of the paper is to provide a relative easy access to HAM modeling and simulation for people who have only minor experience with Matlab and COMSOL. --------------------------------- Keynote speaker's ...

Heat and Mass Transfer in Reactive Multilayer Systems (RMS)

M. Rühl[1], G. Dietrich[2], E. Pflug[1], S. Braun[2], A. Leson[2]
[1]TU Dresden, Laser and Surface Technology, Dresden, Germany
[2]IWS Dresden, Fraunhofer Institute for Material and Beam Technology, Dresden, Germany

Established joining techniques like welding, soldering or brazing typically are characterized by a large amount of heat load of the components. Especially in the case of heat sensitive structures like MEMS this often results in stress induced deformation and degradation or even damaging of the parts. A back door of this problem are Reactive Multilayer Systems (RMS). These foils consist of several ...

Design and Simulation of a Spout Fluid Bed Coating System

Joel L. Plawsky and Howard Littman
Department of Chemical and Biological Engineering
Rensselaer Polytechnic Institute
Troy, NY

Since aerogel materials are open cell, inorganic foams, the surface pores of the material must be sealed for large scale application. Here we discuss the design and development of a spout fluid bed system for producing coated aerogel particle material. COMSOL Multiphysics was used in the design of the system to track the details of the flow field and individual aerogel particle trajectories. ...

Non-Isothermal Kinetics of Water Adsorption in Compact Adsorbent Layers on a Metal Support

G. Füldner, and L. Schnabel
Fraunhofer Institute of Solar Energy Systems, Freiburg, Germany

Water adsorption in highly porous materials can be used in heat transformation processes for the efficient use of energy in heat and cold production. One technology for such a thermal heat transformation is the use of water adsorption in highly porous adsorbents like zeolite. To optimize the power density of compact thin layer adsorbent beds, a one-dimensional model of the coupled heat and mass ...

Porous Media Based Model for Deep-Fat Vacuum Frying Potato Chips

A. Warning, A. K. Datta, A. Dhall, and D. Mitrea
Department of Biological and Environmental Engineering
Cornell University
Ithaca, NY

A multiphase porous media model involving heat and mass transfer within a potato chip was implemented in COMSOL 3.5a. The diffusive flux in oil and liquid water was modeled from capillary driven flow while the gas phase was modeled using binary diffusion. A non-equilibrium water evaporation rate was used and Darcy's law for the momentum equation to solve for the convection of each ...

Heat and Mass Transfer Modeling During Freezing of Foodstuffs

O. Rouaud[1], T. Pham[2]
[1]LUNAM Université, ONIRIS, CNRS, GEPEA, UMR, Nantes, France
[2]University of New South Wales, Sydney, Australia

A mathematical model is developed to determine the weight loss and the freezing rate during the freezing of unwrapped foodstuffs. The model allows comparing two freezing processes; the first uses nitrogen gas at -80°C and the second uses cold air. The model includes thermophysical properties that are temperature dependent to take into account the ice formation. The time step has to be chosen ...

Improvements in the Modeling of the Self-ignition of Tetrafluoroethylene

M. Beckmann-Kluge, F. Ferrero, V. Schröder, A. Acikalin, and J. Steinbach
Federal Institute for Materials Research and Testing, Technical University, Berlin, Germany

Tetrafluoroethylene (TFE) is a gas widely employed in industry, which can under specific circumstances experience an exothermic dimerization to octafluorocyclobutane. If the heat generated by this reaction cannot be dissipated to the surroundings, the temperature inside the reactor will continue rising, leading to conditions where TFE can decompose in tetrafluoromethane and carbon black. This ...

A FEM Analysis of Transport Phenomena occurring during Vegetable Drying

S. Curcio
University of Calabria

The aim of the present work is the formulation of a theoretical model describing the transport phenomena involved in a food drying process by a convective oven. The proposed model represents a general and predictive tool capable of describing the real oven’s behavior over a wide range of process and fluid-dynamic conditions. The resulting system of non-linear unsteady-state partial ...

Using Temperature Signals to Estimate Geometry Parameters in Fractured Geothermal Reservoirs

F. Maier[1], P. Oberdorfer[1], I. Kocabas[2], I. Ghergut[1], M. Sauter[1]
[1]Dpt. Applied Geology, Center of Geosciences, Georg-August-University, Göttingen, Germany
[2]Petroleum and Natural Gas Engineering Department Batman, Batman University, Batman, Turkey

We compare the output of 2D single fracture models as well as analytical solutions of the problem. The temperature signal is evaluated with the heat transfer mode while the flow field is assumed to exhibit Darcy flow everywhere. The problem is time-dependent so we have to take into account a change in the boundary conditions from a Dirichlet to a Neumann condition which is activated at the time ...

Influence of the Atmospheric Disturbance on the Respiration of a Forest Soil

C. Wylock[1], S. Goffin[2], M. Aubinet[2], B. Longdoz[3], B. Haut[1]
[1]Université Libre de Bruxelles (ULB), Transfers, Interfaces and Processes (TIPs), Brussels, Belgium
[2]University of Liège-Gembloux Agro-Bio Tech, Unit of Biosystem Physics, Gembloux, Belgium
[3]INRA, Centre INRA de Nancy, UMR1137 Ecologie et Ecophysiologie Forestières, Champenoux, France

The assessment of forest soil respiration and its isotopic composition is one of the important issues for the carbon cycling modeling (greenhouse gas emission control) because it is often inaccurate. Soil respiration is a complex process, depending on the coupling of several phenomena, which is therefore highly sensitive to any disturbance. In this work, the dynamics of the transport of two ...

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