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.

Computational Modeling of the Electrohydrodynamics Influencing Trace Mercury Adsorption within Electric Utility Electrostatic Precipitators

H. Clack[1]
[1]University of Michigan, Ann Arbor, MI, USA

Anthropogenic mercury (Hg) emissions increase the risk of neurological and neonatal health effects in humans through fish consumption. There are several technological approaches to controlling mercury emissions from coal combustion, including the injection of a powdered mercury sorbent into the flue gas upstream of the particulate control device (PCD). As most PCDs are electrostatic ...

微波干燥电磁场、多相传输及大变形三维耦合模型

张春 [1], 朱铧丞 [1], Ashim Datta [1],
[1] 四川大学,成都,四川,中国

引言:微波干燥过程涉及多物理场的耦合,物理过程十分复杂。不仅有被加热物质的形态改变,还有气态、液态和固态三相的相互作用。为了更清楚地理解微波干燥过程,本模型将电磁场、多相流和物理变形用相应的方程耦合到一起建模分析,并用相应的物理参数表征微波干燥过程。(图1) COMSOL Multiphysics® 的使用:借鉴微波加热接口土豆模型,添加气体和固体传热接口以及自定义方程,用方程和参数实现多物理场耦合。实验模型中,干燥物为土豆,且被视为多孔弹性介质。物质变形用相应的矩阵来表征。 结果:在仿真结果的基础上,利用家用微波炉干燥土豆,设计实验,并测量了微波干燥过程中的重要物理参数,如温度、水分和形变。(图2,图3) 结论:该仿真模型和实验基本吻合,较清晰地反应了微波干燥的复杂物理过程。

Hybrid FEM-BEM Approach for Two- and Three-Dimensional Open Boundary Magnetostatic Problems

A.Weddemann[1], D. Kappe[2], and A. Hütten[2]
[1]Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge MA, USA
[2]Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany

In principal, the calculation of the magnetic state inside a magnetic object requires the evaluation of the field in the entire unbounded space. With finite element methods restricted to finite domains, commonly auxiliary domains are employed which result in a non-physical cut-off. Not only are these additional domains result in an increased number of degrees of freedom which are strictly ...

FEM Modeling of Electric Field and Potential Distributions of MV XLPE Cables Containing Void Defect

M. Alsharif[1], P. Wallace[2], D. Hepburn[2], C. Zhou[2]
[1]Department of Physics, Faculty of Arts, Sebha University, Sebha, Libya
[2]School of Engineering & Computing, Glasgow Caledonian University, Glasgow, United Kingdom

Introduction: Failure in cable insulation is generally preceded by a degradation phase that may last several years. A significant cause of cable system failures is the breakdown of electrical insulation between the electrodes. The operational stresses that occur in cable insulation which include thermal, mechanical and electrical effects will vary with time and can cause degradation due to the ...

Smart Chest Belt for Cardiac Health Monitoring - new

M. Vijayalakshmi[1], R. C. Thiagarajan[1]
[1]ATOA Scientific Technologies Pvt. Ltd., Bengaluru, Karnataka, India

Conventional cardiac electrical signal monitoring and measurement techniques such as Electrocardiograph (ECG) are prone to operator error due to multiple lead attachment requirements. These multiple electrode based systems are also not convenient for continuous cardiac health monitoring, though ECG is the best way to measure and diagnose abnormal rhythms of the heart. In this paper, a smart ...

Sensibility Analysis of Inductance Involving an E-core Magnetic Circuit for Non Homogeneous Material

K. Z. Gomes [1], T. A. G. Tolosa [1], E. V. S. Pouzada [1],
[1] Mauá Institute of Technology, São Caetano do Sul, SP, Brazil

In this work, a methodology is developed, based on the application of finite element method in the frequency domain, using the COMSOL Multiphyics software, aiming the sensibility analysis of inductance calculation involving some configurations of an E-core magnetic circuit. Such important analysis, are made from several geometries and considering different frequencies for the source current ...

Design and Simulation of an Electromagnetic Valve Actuator Using COMSOL Multiphysics

R. Wislati , H. Haase
Leibniz Universität Hannover, Germany

In this paper an electromagnetic solenoid actuator (EMVA) consisting of an upper and lower electromagnet, a linear moving armature and two preloaded springs is considered as a potential approach in Variable Valve Actuation (VVA) Systems for Internal Combustion Engines. In opposition to common approaches the underlying EMVA make use of a permanent magnet in the upper electromagnet. The analysis ...

Effect of a High Frequency Field on the Electric Double Layer Surrounding a Biomolecule in a Fluid - new

M. Riou[1], C. Maedler[1], S. Erramilli[1], P. Mohanty[1]
[1]Boston University, Boston, MA, USA

Biosensors based on silicon nanowires are of great interest for ultrasensitive biomolecular recognition of disease specific markers for early stage diagnosis [1]. However, there are limitations on the performance of these nanosensors in solutions at high ionic strength. This is because the electric field induced by the binding of biomolecule is partially screened on length-scales larger than the ...

Electromagnetic Processing from AC to DC Field and Multiphysics Modeling: a Way for Process Innovation

M. Dumont [1], R. Ernst [2], Y. Fautrelle [2], J. Etay [2]
[1] Emdpi Solutions-JAM, France
[2] Simap, France

Examples of Electromagnetic processes are presented: (1) cold crucible, (2) electromagnetic pump, (3) DC electromagnetic brake. A combined approach by using multiphysics modeling with Comsol and experimental validation is used in order to give some guidelines for process improvement and integration at industrial scale. A time-dependent 2D or 3D multiphysics electromagnetic fluid mechanics ...

On the Simulation of the Lightning Strikes to Complex Grounded Structures

M. Becerra
Royal Institute of Technology
School of Engineering
Electromagnetic Engineering Lab
Stockholm, Sweden

There is a considerable world-wide interest among lightning protection engineers and designers on the improvement of the standard procedures to assess the location of the most vulnerable places on complex structures to be struck by lightning flashes. This paper presents the implementation of the Self-consistent Lightning Interception Model in Matlab by using the COMSOL Multiphysics 3.5 ...