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.

Detection of Magnetic Particles by Magnetoresistive Sensors

A. Weddemann[1], A. Auge[1], F. Wittbracht[1], C. Albon[1], and A. Hütten[1]
[1]Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany

In this work, we demonstrate the implementation of the micromagnetic equations for the description of ferromagnetic thin films in COMSOL Multiphysics®. We apply our model to magnetoresistive sensors consisting of several soft ferromagnetic layers and their response to magnetic particles. The magnetization dynamic of the particles needs to be described in a similar manner, though due to size ...

Computational Micro Fluid Dynamics: Part 1: Basic Principles and Simulation

F. Schönfeld
Institut für Mikrotechnik Mainz, Fluidik und Simulation, Mainz

The development of micro-TAS, Lab-on-a-Chip-systems and micro-reactors relies on the extensive use of computational fluid dynamics (CFD). The presentation aims to highlight specific µ-fluidic features, adequate simulation methods and benefits in context with the design of microfluidic systems. A case study discusses the modeling and characterization of a microfluidic device combining ...

Perspectives of Thermo-electro-mechanical Micro Actuators for Micro Switch Applications: Design and Simulation

M. Matmat, M. Al Ahmad, and J. Y. Fourniols
Laboratoire d'Analyse et d'Architecture des Systèmes (LAAS-CNRS), Toulouse, France

In this work, thermo-mechanical simulations employing a 3D finite element analysis (FEA) of a current driven V-shaped actuator is presented. The structure's hot arms consist of polysilicon, which was used as the active material for deflection due to the Joule effect.COMSOL Multiphysics with stationary and parametric solvers was used to calculate the resulting deflection when current is applied. ...

Development of Surface Micromachinable Capacitive Accelerometer using Fringe Electrical Field

S. Aoyagi1, and Y.-C. Tai2
1Robot & Microsystem Laboratory, Kansai University, Osaka, Japan
2Caltech Micromachining Laboratory, California Institute of Technology, Pasadena, USA

A new type of accelerometer is demonstrated which consists of a dielectric seismic mass and a comb-shaped planar capacitor underneath it. The simple structure of the device allows the use of polymer Parylene as the proof mass, so the technology is greatly simplified and only surface micromachining is required. The measuring principle is detecting capacitance change according to the dielectric ...

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 ...

Modeling and Simulation of MEMS Based 3D Vibrating Gyroscope for Mobile Robotics Applications

M. Ramya, R. P. S. Valli, R. Vidya, G. Anju, and M. Alagappan
PSG College of Technology
Tamil Nadu, India

In this study, a biomimetic vibrating 3D MEMS Gyroscope is designed, consisting of two circular diaphragms with a club shaped structure placed over one of them. This MEMS based vibrating gyroscope was modeled and simulated using COMSOL Multiphysics 4.1 - MEMS module. The purpose of the research was to develop an effective gyroscope for guidance and control of mobile robots. The simulated ...

Modeling Electric Fields in Slit Capillary Array Fluidic Actuators with Complex Electrode Geometries

J. Frey[1], A. Droitcour[1], D. Laser[1]
[1]Wave 80 Biosciences, San Francisco, CA, USA

With their small size, low manufacturing cost, fast transient response, and capacity to generate fluid power directly from small electrical power sources, microdevices incorporating electroosmostic flow (EOF) have wide-ranging applications, including newly developed high-performance bioassay systems suitable for use in resource-limited settings. We report on a class of EOF-based devices called ...

Particle Flow Control by Magnetically Induced Dynamics of Particle Interactions

F. Wittbracht[1], A. Weddemann[1], A. Auge[1], and A. Hütten[1]

[1]Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany

In this work, we show that dipolar magnetic coupling can be used to control the particle flow through microfluidic structures without changing the state of motion of the carrier liquid. Also no external magnetic gradient fields are employed; the total external magnetic force applied is therefore zero. The theoretical idea will be tested experimentally. Here, additional effects originating from ...

Poisson Based Modeling of DC and AC Electroosmosis in Microfluidic Channels

M. Pribyl, and D. Snita
Department of Chemical Engineering, Institute of Chemical Technology, Prague

Two mathematical models of the electrokinetic flow are presented where the electroosmotic flow is induced by the interaction of a surface electric charge with a perpendicularly imposed electric field. In order to solve such problems, an anisotropic mesh of rectangular finite elements is developed. Stationary distributions of the model variables are computed for various sets of model ...

Simulation of Surface Stress Effect on Mechanical Behaviour of Silicon Microcantilever

A. Ricci, E. Giuri, and C. Ricciardi

Microcantilevers made of crystal silicon are probably the most diffused type of MEMS because of their simple fabrication and their vast applications. In this presentation we treat the mechanical behaviour of silicon mirocantilevers, and also give an overview of the many application areas that these apply to.

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