Presentazioni e Articoli Tecnici

In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Numerical Validation of the Efficiency of Dual-Frequency Radiofrequency Ablation

A. Candeo[1] and F. Dughiero[1]
[1]Department Electrical Engineering, University of Padova, Padova, Italy

Radiofrequency Ablation (RFA) represents a valid alternative for treating liver metastases in medically complicated patients. Conventional devices currently operate at 500 kHz, due to good conducting properties of tissues. However, the use of lower frequencies (i.e. 20 kHz) has been recently reported to enhance the treatment effectiveness, due to a more pronounced difference in electrical ...

Analysis of Electrical Phenomena Occurring in Thermally Assisted Mechanical Dewatering Processes

A. Mahmoud, A. Fernandez, and P. Arlabosse
Ecole des Mines d’Albi Carmaux, Albi

The so-called opposite electrode pair measurement strategy is adapted in a filtration/expression cell filled with a model material packed bed. In this paper, we investigate the electrical properties of a packed bed, with particular emphasis on its overall conductivity. As a special case study we treat potassium chloride solutions, using model materials of different particle sizes.

2D Extraction of Open-Circuit Impedances of Three-Phase Transformers

R. Escarela-Perez[1], E.A. Gutierrez-Rodriguez[2], J.C. Olivares-Galvan[1], M.S. Esparza-González, and E. Campero-Littlewood[1]

[1]Departamento de Energia, Universidad Autonoma Metropolitana - Azcapotzalco, Mexico D.F., Mexico
[2]Instituto Tecnologico de Aguscalientes, Aguascalientes, Mexico

This work is concerned with the study of the asymmetrical phenomenon observed in three-phase transformers during the standard short-circuit test. The purpose of our work is to see if the asymmetric measurements can be predicted with the use of 2D finite-element models. To this end, we use the AC/DC Module of COMSOL Multiphysics. A multi-port network impedance is then determined to explain the ...

Designing B-field Coils from the Inside-Out

C.B. Crawford[1], Y. Shin[1], and G. Porter[1]
[1]Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky, USA

Traditionally the design cycle for magnetic fields involves guessing at a reasonable conductor / magnetic material configuration, using FEA software to calculate the resulting field, modifying the configuration, and iterating to produce the desired field. Our method involved solving the classical Laplace equation on regions with imposed boundary conditions, which was implemented straightforwardly ...

Finite Element Analysis of Microscale Luminescent Glucose Sensors in the Skin Dermis

S. Ali[1], and M. McShane[1]
[1]Department of Biomedical Engineering, Texas A&M University-College Station, Texas, USA

With the rising predominance of diabetes, successful management of blood glucose levels is increasingly important. Key efforts have focused on the development of optical microscale glucose sensing systems based on the encapsulation of glucose oxidase within microspheres coated with polyelectrolyte multilayer nanofilms. A two-substrate mathematical model of microscale optical glucose sensors in ...

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 ...

Multiphysics 2007

J. Dunec
COMSOL, Palo Alto

In this presentation we present where COMSOL Multiphysics and its modules will be in the year 2007. The presentation considers the upcoming features, not only from a developers point of view, but also through examples from different branches of applied physics and mathematics. In addition, we present some important milestones during the past 10 years for COMSOL ...

An Efficient Approach to Identifying a Complete Photonic Band Gap in Two-dimensional Photonic Crystals with Omnidirectional Light Propagation

Ming-Chieh Lin
Assistant Professor
NanoScience Simulation Laboratory
Department of Physics
Fu Jen Catholic University
Taipei, Taiwan

Omnidirectional light propagation in two-dimensional (2D) photonic crystals (PCs) is investigated. An efficient approach to identifying a complete photonic band gap (PBG) in 2D PCs has been developed. The in-plane band structure of 2D photonic crystals is calculated by an adaptive finite element method, as implemented in FEMLAB. Adopting the suitable boundary conditions, the eigenvalues can be ...

Numerical Simulation versus Experiments and Analytical Computation for Design Optimization

Mario Jungwirth
Upper Austria University of Applied Sciences
Wels, Austria

This presentation deals with how COMSOL Multiphysics can be used in education. The presentation is performed by demonstrating various multiphysics examples, their setup, modeling approach, and solution. ------------------------------------------- Keynote speaker's biography: Dr. Mario Jungwirth has been a professor at the Upper Austria University of Applied Sciences since 2003. In 2001, he ...

Optimum Design of Dual-modality Sensing Electrode Array

W. Huaxiang, W. Jing, H. Li, and J. Weiwei
School of Electrical Engineering & Automation, Tianjin University, Tianjin, Taiwan

Sensing electrodes array model of 3-Dimensional ERT/ ECT dual modality is established by using the software COMSOL. According to the uniformity of sensitivity field distribution, the correlation coefficient and the reconstructed image space resolution, the ECT/ERT dual modality sensing electrode arrays are optimized. Experimental results show that the optimized sensing electrode array of the ...

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