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.

Study of a Silicon Photodetector Thermal Stabilization using a Peltier Cell

E. Foschi1, C. Guandalini2, G. Levi1, L. Quadrani1, C. Sbarra 1,3, and M. Zuffa2
1Department of Physics, University and INFN, Bologna, Italy
2INFN, Bologna, Italy
3Centro Studi e Ricerche E.Fermi, Roma, Italy

In recent years, a new type of silicon photon detection devices (SiPM) has been developed. These devices have advantages in comparison to normal photomultiplier tubes (PMT), but being made by an array of avalanche photo diodes operated in Geiger mode, they are much more sensitive to temperature changes than standard PMTs. Typical SiPM gains vary from 3 to 5 percent per degree Centigrade. In space ...

Modeling the Coupled Heat and Mass Transfer during Fires in Stored Biomass, Coal and Recycling Deposits

F. Ferrero, M. Malow, A. Berger, and U. Krause
Bundesanstalt für Materialforschung und prüfung (BAM), Berlin, Germany

In this paper, advances in the development of a numerical model for predicting the possibility of self-ignition in stored biomass, coal heaps or underground seams and dump deposits are presented. Results from the performed simulations are compared with experimental data. Finally, some conclusions and the possibilities for future work are drawn.

3-D Modeling of a Differential Impedance Obstacle Detection Sensor for Horizontal Directional Drilling Operations

J. N. Shah1, A. Jaganathan1, E. N. Allouche1, M. Kieba2, and C. J. Ziolkowski2
1Louisiana Tech University, Ruston, LA, USA
2Gas Technology Institute, Chicago, IL, USA

Horizontal Directional Drilling (HDD) is a commonly used technology for the installation of pipelines, conduits and cables in urban areas and across obstacles such as rivers, railways and freeways. A main concern in using the HDD method is the risk of hitting existing buried utilities during the boring process. The Differential Impedance Obstacle Detection (DIOD), developed by the Gas Technology ...

It Looked Great on Paper! - Use of COMSOL Multiphysics Software to Bridge the Gap between Hand Calculations and Experimental Results in Undergraduate Heat Transfer Education

K. K. Bhatia
Rowan University, Glassboro, NJ, USA

A project involving the design, building, and testing of a hot liquid thermos was implemented in a junior level mechanical engineering heat transfer class. COMSOL Multiphysics software was used to bridge the typical gap between hand calculations of heat transfer performance and experimental results. Student self-assessment survey results showed an overall positive feeling regarding the project.

A Finite Element Analysis of the Influence of Morphology on Barrier Properties of Polymer-Clay Nanocomposites

D. L. Statler Jr., and R. K. Gupta
Department of Chemical Engineering, West Virginia University, Morgantown, WV, USA

Nanocomposites, formed by dispersing a few weight-percent of nanometer-thick platelets of organically-coated montmorillonite clay in a variety of polymers, are being used in food packaging applications. The clay platelets reduce the diffusion coefficient of gases, such as carbon dioxide and water vapor, and prolong the shelf-life of packaged foods and carbonated beverages. Here we use the COMSOL ...

Wind Field Generation for an Urban Scale using COMSOL

H.-J. Jeong
Korea Atomic Energy Research Institute, Korea

This paper presents the application of the nesting method to wind fields on coarse grid to then produce a fine grid wind fields. This is done using COMSOL Multiphysics. Fine-grid wind fields, which are considered to be an urban structure, were useful in drawing scenarios for counter terrorist attacks.Also, it was confirmed that COMSOL Multiphysics could be easily applicable to multi-nesting to ...

A Numerical Approach to the Heat Transfer Studies inside the Human Eye

E. H. Ooi, and E. Ng Yin Kwee
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore

In this presentation, abnormalities in the human eye are studied. The outline for the presentation is:Background of the ResearchModel DevelopmentSteady state solution of a normal eyeEffects of aqueous humor hydrodynamics on the temperature distribution inside the human eyeSummary

Modeling of Microstructures in Dissimilar Copper/Stainless Steel Electron Beam Welds

I.Tomashchuk, P. Sallaman, and J.-M. Jouvard
Institut Carnot de Bourgogne, Université de Bourgogne, Le Creusot, France

In the case of electron beam welding of copper with stainless steel, two principal cases of welding pool morphology are possible: a droplet-like microstructure where the electron beam deviates to the copper side due to the thermoelectric effect, so the volume of molten copper is much bigger than steel, and an emulsion-like microstructure, volumes of melted materials are closely equal. Reproducing ...

Simulation of Highly Nonlinear Electrokinetics Using a Weak Formulation

G. Soni[1], T. Squires[2], and C. Meinhart[1]

[1]Department of Mechanical Engineering, University of California Santa Barbara, CA, USA
[2] Department of Chemical Engineering, University of California Santa Barbara, CA, USA

We present a numerical model for simulating highly nonlinear electrokinetic phenomena, which occurs at high zeta potentials. In this model, the electric double layer is realized by solving a partial differential equation (PDE) on the double-layer-inducing surface. We also allow for a nonlinear surface capacitance, which relates the surface charge density to the zeta potential of the surface. With ...

Magneto-Hydrodynamic Numerical Study of DC Electromagnetic Pump for Liquid Metal

A. Daoud, and N. Kandev
Institut de recherche d'Hydro-Quebec (LTE), Shawinigan, Quebec, Canada

The electromagnetic pumping (EMP) of electrically-conducting fluid is of growing interest for many industrial applications requiring precise flow control, enabling stopping or reversing flow direction without any moving parts or mechanical devices. Presented in this work are the results of a 3D numerical magneto-hydrodynamic (MHD) simulation of direct current (DC) EMP for liquid ...

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