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.

Thixotropie von Bentonitsuspensionen durch Singularitäten

E. Moreira
Universität Louis Pasteur; Fluid Mechanik, Strassburg, France

Das breite Anwendungsspektrum von Bentonitsuspensionen ist auf ihre spezifischen Eigenschaften zurückzuführen, wie z.B. ihre plastischen Eigenschaften (Fließgrenze) und die Thixotropie (unvollkommene Thixotropie). Infolge ihrer Dichte und der Fliessgrenze sind Bentonitsuspensionen in der Lage, Erdwände zu stützen. Das Ziel dieser Arbeit ist, die Entwicklung der rheologischen Parameter ...

Fluid Flow Analysis For Cross-Flow Around Four Cylinders Arranged In A Square Configuration

A. Dutta, P. Goyal, R.K. Singh, and K.K. Vaze
Bhabha Atomic Research Centre, Mumbai, Maharashtra, India

Cross-flow around a group of cylinders is a very common phenomenon in engineering, such as flow around heat exchanger tube arrays. The cross-flow-induced vibration might cause a reduction of equipment life and might even lead to the occurrence of severe accidents. Hence, it is necessary to understand the mechanism of flow-induced vibration and the associated fluid–structure interaction in ...

Building Energy Simulation Using the Finite Element Method

J. van Schijndel[1]
[1]Eindhoven University of Technology, Eindhoven, The Netherlands

In order to predict, improve and meet a certain set of performance requirements related to the indoor climate of buildings and the associated energy demand, building energy simulation (BES) tools are indispensable. Due to the rapid development of FEM software and the Multiphysics approaches, it should possible to build and simulate full 3D models of buildings regarding the energy demand. The ...

Modeling of Laminar Flow Static Mixers

N. Elabbasi[1], X. Liu[1], S. Brown[1], M. Vidal[2], M. Pappalardo[2]
[1]Veryst Engineering LLC, Needham, MA, USA
[2]Nordson EFD, East Providence, RI, USA

Laminar flow static mixers are accurate, inexpensive fluid mixing devices that can handle a wide range of fluids and mixing proportions. They have a wide range of industrial applications, especially in the consumer product, pharmaceutical, biomedical, and petrochemical industries. A good mixing quality is obtained when the outlet of the mixer has no concentrated volumes of either mixed materials ...

Simulation of the Turbulent Flow in HEV Static Mixers : Mixing of Ethanol with Gasoline

A. Eissa[1]
[1]Department of Chemical Engineering, Cairo University, Giza, Egypt

Mixing is a typical unit operation that occurs almost in all chemical industries. Static – alternatively termed motionless – mixers are being widely used due to their low power consumption, low capital investment, minimal maintenance costs and versatility. The traditional helical mixing element is mainly used for in-line blending under laminar and transitional flow conditions. The ...

Mathematical Frame-work for the Productivity Index of Wells with Fast Forchheimer (non-Darcy) Flow in Porous Media

E. Aulisa [1], A. Ibragimov[1], P. Valko [2], and J. Walton[3]
[1] Texas Tech University, Department of Mathematics and Statistics
[2] Texas A & M University, Department of Petroleum Engineering
[3] Texas A & M University, Department of Mathematics

In the current paper, similar features for fast or turbulent, non-linear flows subjected to Forchheimer equations are analyzed. Under some hydrodynamic and thermodynamic constrains, it has been shown that there exists the so called pseudo-steady state regime for Forchheimer flows in reservoir media. This invariant is called diffusive capacitance, which is the mathematical model for the well ...

Stability Analysis of a Boiling Loop in Space

W. R. Schlichting1, R. T. Lahey Jr.1, M. Z. Podowski1, and T. A. Ortega G?mez2
1Center for Mutliphase Research, Rensselaer Polytechnic Institute, Troy, NY, USA
2Institute for Nuclear & Energy Technologies, Karlsruhe Institute of Technology, Karlsruhe, Germany

Boiling systems must be analyzed to determine their stability characteristics. Multiphase system instabilities can be predicted by the use of a one-dimensional drift-flux model. Using this model, an analysis has been performed with the COMSOL code to investigate both linear and nonlinear instability phenomena. In particular, density-wave oscillations in boiling channels were investigated, and, ...

Analysis of Lubricant Flow Through Reynolds Equation

K.C. Koppenhoefer[1], S.Y. Yushanov[1], L.T. Gritter[1], J.S. Crompton[1], and R.O. Edwards[2]
[1]AltaSim Technologies LLC, Columbus, OH, USA
[2]Cummins Fuel Systems, Columbus, IN, USA

Reynolds equation is used to analyze fluid flow through small gaps. As such, the solution of Reynolds equation provides critical information for a wide range of tribological problems. In any case where a lubricant resides between two moving surfaces, the Reynolds equation can be used to solve for the flow. In the case considered in this paper, lubricant flows between a piston and housing forced ...

Drying In Porous Media: Equilibrium And Non-Equilibrium Approaches For Composting Processes

A. Pujol[2], S. Pommier[3], G. Debenest[2], M. Quintard[2], and D. Chenu[1]
[1]Veolia Environnement, Limay, France
[2]IMFT, Toulouse, France
[3]INSA Toulouse, Toulouse, France

To understand origins and consequences of drying phenomenon during composting, a compositional drying model of a partially water-saturated porous media coupled with biodegradation has been developed. The different simulations carried out under COMSOL Multiphysics demonstrate the ability of the model to well describe the compositional drying of a partial water-saturated porous media and point out ...

Transport Phenomena of Bubbles in a High Viscous Fluid

F. Pigeonneau
CNRS/Saint-Gobain, France

Dr. Franck Pigeonneau is currently working in the joint laboratory between the Centre National de la Recherche Scientifique (CNRS) and the company Saint-Gobain. He received his Ph. D. in 1998 from the University Pierre et Marie Curie (Paris, France). His main research activities are devoted to the transport phenomena in high viscous fluids relevant for glass melting processes. He is using COMSOL ...

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