Technical Papers and Presentations

Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Coupled Electromagnetic - Dynamic FEM Simulation of A High Frequency MEMS Energy Harvester

E. Topal
Middle East Technical University

In this study, a detailed finite element model coupling the motion dynamics and electromagnetics of a diaphragm based MEMS vibration energy harvester is presented. The energy harvester converts low frequency vibrations to high frequency response by magnetic actuation of a diaphragm carrying coils. AC/DC, Solid Mechanics and Moving Mesh (ALE) modules are coupled together in one 3-D model to ...

Designing and Simulating the Performance Analysis of Piezoresistive Fluid Flow Pressure Sensor

K. PraveenKumar[1], P. Suresh[1], K. Subash[1], M. Alagappan[1], A. Gupta[1]
[1]PSG College of Technology, Coimbatore, Tamil Nadu, India.

In this work, we present the performance analysis of novel micro machined Piezoresistive fluid flow pressure sensor using COMSOL Multiphysics. The principle of the sensing mechanism is based on the deflection of four sensing layers embedded on a thin membrane. The fluid passes through the layer causes the deflection of the sensing layer which measures the pressure of the fluid. The following ...

Numerical and Experimental Evaluation for Measurement of a Single Red Blood Cell Deformability Using a Microchannel and Electric Sensors

K. Tatsumi[1]
[1]Kyoto University, Kyoto City, Kyoto, Japan

An electric micro-resistance sensor that can continuously measure the deformability of a single red blood cell (RBC) in a microchannel and a numerical model that can simulate the resistance and capacitance of the cell membrane and cytoplasm are developed and improved. The resistance signal pattern between the electrodes is measured to evaluate the feasibility of the present sensor, using the ...

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 ...

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 ...

Numerical Simulations of a Traveling Plane-Wave Actuator for Microfluidic Applications

A.F. Tabak, and S. Yesilyurt
Sabanci University, Istanbul, Turkey

Continuous forming and propagation of large planar deformations on a thin solid elastic film can create propulsion when the film is immersed in a fluid. In this work, we present a numerical analysis of the effect of traveling plane-wave deformations on an elastic-film actuator within a fluid medium inside a channel. In particular, we analyzed a micropump that consists of a wave actuator. ...

Simulation of Magnetic Beads in on-chip Structures

A. Weddemann, A. Hütten, S. Herth, and M. Schilling
Universität Bielefeld, Fakultät für Physik, Bielefeld

In this work, a system for magnetic and hydrodynamic manipulation of magnetic beads is modelled. A geometry is introduced to assure a good separation behaviour with respect to the magnetic moment of the particles. Different separation mechanisms will be discussed and an estimation of the minimal difference of separable magnetic moments will be given. Further it will be shown, that the ...

Optimization of the Temperature Distribution in a Chemical Microreactor using a Multi-Segment Integrated Thin Film Heater

T.R. Henriksen, S. Jensen, U. Quaade, and O. Hansen
Technical University of Denmark

COMSOL Multiphysics has been used to study the effect of different heater design parameters on the temperature distribution in a chemical microreactor. The primary objective of the simulations has been to optimize the temperature uniformity inside the reaction chamber. In the simulations, special attention has been given to how the number, positions and widths of the heater strips relate ...

A Magnetically Driven Micro-Mixing Device and its Numerical Analysis

A. M. Morega1, J. C. Ordonez2, and M. Morega1
1Politehnica University of Bucharest, Bucharest, Romania
2Florida State University, Tallahassee, FL, USA

In this paper, we present a FEM model of a mixing MEMS μTAS device. A quasistatic magnetic field, produced by sequentially switched DC currents advected through conductors embedded in the device substrate beneath the flow channel, is used to mix the working magnetic fluid, while it is forced to flow through a rib walled channel. The body forces in the magnetized fluid perturb the otherwise ...

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. ...

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