Artigos Técnicos e Apresentações

Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abramgem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

Pre-design of a Molten Salt Thorium Reactor Loop

J. P. Caire, and A. Roure
LEPMI-ENSEE, Saint Martin d'Hères, France

The generation 4 of molten salt reactors using the thorium cycle are characterized by a temperature close to 1000 oC. The very large heat transfers involved between the reactor core and the external parts with minimal thermal losses are a major issue. This study investigated a possible inner loop made of a series of conventional graphite filter plate exchangers, pipes and pumps, using the COMSOL ...

Simulation Of A Hydrogen Permeation Test On A Multilayer Membrane

J. Bouhattate, E. Legrand, A. Oudriss, S. Frappart, J. Creus, and X. Feaugas
Laboratoire d’Etude des Matériaux en Milieu Agressif, LEMMA, Bat. Marie Curie, La Rochelle, France

To understand a metal susceptibility to Hydrogen Embrittlement (HE), it is important to quantify the diffusion of hydrogen through a metallic membrane. Electrochemical permeation tests are the most common methods for experimentally determining the diffusion coefficient of a metal. However the parameters directly accessible from experiments are the time required for a stream to be observed and the ...

Analysis of TAP Reactors Procedures Using COMSOL

S. Pietrzyk[1], and G.S. Yablonsky[2]
[1]Unité de Catalyse et Chimie du Solide, Université des Sciences et Technologies de Lille, France
[2]Parks College, Saint Louis University, St. Louis, MO, USA

TAP (Temporary Analysis of Products) reactors are powerful instruments to study the kinetics of catalytic reactions. Their basic principle, exposition of evacuated solids of interest to narrow pulses containing very small amounts of gases, and measuring the concentrations of outgoing molecules permits to study practical catalysts under the conditions approaching those of molecular beam ...

Modeling of Chemo-Mechanical Coupled Behavior of Cement Based Material

D. Hu[1], F. Zhang[2], H. Zhou[3], and J. Shao[1]
[1]LML, UMR8107, CNRS, University of Lille I, Lille, France
[2]School of Civil Engineering and Architecture, Hubei University of Technology, Wuhan, China
[3]State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China

A lixiviation-mechanical coupled model is developed for fiber reinforced concrete within this framework; both the influence of chemical degradation on short and long term mechanical behavior and the influence of mechanical loading on the diffusion coefficient can be considered. The elastic mechanical properties are written as function of chemical damage. A Drucker–Prager typed criterion with ...

Modeling the Performance of Energy Recovery Ventilators

N. Lemcoff[1], R. Pastor[2], and E. Miravete[1]
[1]Rensselaer Polytechnic Institute, Hartford, CT
[2]General Dynamics Electric Boat, Groton, CT

The objective of this study is to numerically evaluate the effectiveness of an energy recovery ventilator (ERV) during the summer and winter seasons. The energy recovery ventilator allows heat and mass transfer between two air streams separated by a membrane. The effects of varying the following parameters were examined: flows through the supply and exhaust ducts, height of the exhaust channel, ...

Coupled Heat and Moisture Transfer in Building Components - Implementing WUFI® Approaches in COMSOL Multiphysics

B. Nusser[1], M. Teibinger[1]
[1]Holzforschung Austria, Vienna, Austria

Calculating time-dependent heat and moisture transports trough building components are important tasks in the area of building physics. A well known and worldwide used commercial software for this is WUFI®. From the scientific point of view the restricted access to governing equations is nevertheless a drawback of this software. In the present paper it is shown how the physical approaches used ...

Temperature profiles of molten flowing polymers in a channel die

Karkri, M.1, Jarny, Y.2, Mousseau, P.3, Poncet, E.1
1 CNRS UMR 6174 Institut FEMTO-ST - Département CREST, Belfort France
2 UMR CNRS 6607 Ecole Polytechnique de l’Université de Nantes, France
3 UMR CNRS 6144 IUT de Nantes, France

Extrusion is one of the important manufacturing methods in many industries. In order to obtain the desired product quality and characteristics, the knowledge of the thermal state of the die is very important. In the present study, a two-dimensional conjugate heat transfer model has been developed for non-Newtonian materials being processed in the extrusion die. The modeling equations for the ...

Modeling the iodine removal efficiency and temperature behavior for an FADS charcoal filter by FEMLAB

Qin, Z.1, Wren, J.C.1, Moore, C.J.2
1 Department of Chemistry, The University of Western Ontario, London, Ontario, Canada
2 Chalk River Laboratories, Atomic Energy of Canada Limited Chalk River, Ontario, Canada

A key component of the Filtered Air Discharge System in nuclear power reactors is a charcoal filter, intended to remove gaseous fission products, mainly radioiodine, in the unlikely event of an accident. Models for removal of CH3I and temperature behaviour of a charcoal filter have been described. The CH3I removal model is based on a mass balance equation consisting of CH3I transport due to ...

Bio-Effluents Tracing in Ventilated Aircraft Cabins

G. Petrone[1], L. Cammarata[1], and G. Cammarata[1]
[1]Department of Industrial and Mechanical Engineering, University of Catania, Catania, Italy

Ventilation and Indoor Air Quality (IAQ) are issues of very high interest, determining comfortable conditions for occupants and no-contaminated local atmosphere. The aircraft cabins are more confined and have a higher occupant density than other indoor environments such as offices or residential houses. The passengers and the crew share a closed and ventilated cabin, which brings potential risk ...

Fundamental Three Dimensional Modeling and Parameter Estimation of a Diesel Oxidation Catalyst for Heavy Duty Trucks

A. Holmqvist[1] and C.U.I. Odenbrand[1]

[1]Department of Chemical Engineering, Faculty of Engineering, LTH, Lund University, Lund, Sweden

Mathematical optimization can be used as a computational engine to generate the best solution for a given problem in a systematic and efficient way. In the context of monolithic converter systems, the parameter estimation problem (or inverse problem) is solved using Partial Differential Equations (PDE)-based models of the physical system coupled with an optimization algorithm. These problems are ...

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