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.

Simulation of Deformed Solid Particles in Constrained Microfluidic Channel

M. Cartas-Ayala[1], R. Karnik[1]
[1]Massachusetts Institute of Technology, Cambridge, MA, USA

Characterization of particles has numerous applications in science and diagnostics. Recently, particle passage through constrained microchannels has been proposed to characterize particles based on their passage velocity. Nevertheless, there is no clear understanding of how the physics in this system interact. Here we quantify the effects of the flow around the particle by simulating the passage ...

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 ...

Dynamic Observation of Magnetic Particles in Continuous Flow Devices by Tunneling Magnetoresistance 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

Dynamic measurement of magnetic particles in continuous flow devices is made very difficult by the limitations imposed by the sensors themselves. Thus, certain sensor layouts are restricted to either number sensitive or spatial resolutive measurements of magnetic particles. We investigate different new strategies to increase the detection threshold and introduce designs accomplishing both: ...

Water spreading anaysis on fabrics surfaces

Fichet, D.1, Lesage, F.1, Ventenat, V.2, Latifi, M.A.2
1 Laboratoire des Sciences du Génie Chimique, CNRS-ENSIC, Nancy Cedex, France
2 Centre de recherche Decathlon, Villeneuve d’Ascq, France

This paper deals with experimentation, modelling, simulation and optimisation of a Moisture Management Tester (MMT) which is used to determine the liquid spreading and transfer rates of a fabric. A 3D model was developed and implemented within FEMLAB. It consists of partial differential equations describing the mass balance of water adsorbed on the fibres and water moving in the free volume ...

Design and Modeling of a Micro-active Suspension

T. Verdot, and M. Collet
Dept. of Applied Mechanics, FEMTO-ST Institute, Besançon, France

Nowadays, lightweight materials are widely used to reduce weight and increase available space in moving structures such as cars or aircraft. However, they constitute an intense vibrating environment that can strongly affect the operation of embedded micro-transducers such as frequency generators or inertial sensors. To alleviate this problem, we propose the concept of a Micro-Active Suspension ...

Development and Characterization of High Frequency Bulk Mode Resonators

H. Pakdast, Z. Davis
DTU Nanotech, Technical University of Denmark, Kgs. Lyngby, Denmark

This article describes the development of a bulk mode resonator which can be employed for detection of bio/chemical species in liquids.  The goal is to understand the mechanical and electrical properties of a bulk mode resonator device which exhibit high frequency resonance modes and Q-factor. A high resonance frequency is desirable because a small change in the resonator’s mass, for ...

Modeling and Characterization of Superconducting MEMS for Microwave Applications in Radioastronomy

N. Al Cheikh[1], P. Xavier[1], J. Duchamp[1], and K. Schuster[2]
[1]Institute of Microelectronics, Electromagnetism and Photonics (IMEP-LAHC), Grenoble, France
[2]Institute of Millimetrics Radio Astronomy (IRAM), Grenoble, France

Superconducting GHz electronics circuits are frequently used in Radio Astronomy instrumentation. The features of these instrumentations can be significantly improved by using tuneable capacitances, which can be realized by electrically actuated, micromechanical bridges (MEMS) made of superconducting Niobium (Nb). In order to analyze the electromechanical behavior of such devices and the intrinsic ...

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 ...

Combined Analytical and Numerical Modeling of a Resonant MEMS Sensor for Viscosity and Mass Density Measurements

S. Cerimovic[1], R. Beigelbeck[2], H. Antlinger[3], J. Schalko[2], B. Jakoby[3], and F. Keplinger[1]
[1]Institute of Sensor and Actuator Systems, Vienna University of Technology, Vienna, Austria
[2]Institute for Integrated Sensor Systems, Austrian Academy of Sciences, Wiener Neustadt, Austria
[3]Institute for Microelectronics and Microsensors, Johannes Kepler University Linz, Linz, Austria

A resonant MEMS sensor for viscosity and mass density measurements of liquids was modeled. The device is based on Lorentz-force excitation and features an integrated piezoresistive readout. The core sensing element is a rectangular vibrating plate suspended by four beam springs. The liquid surrounding the plate influences the resonant behavior of the system. Thus, evaluating the properties of ...

Multiphysics Modeling of Nanoparticle Detection - Current Status and Collaboration Sought

D. Krizaj[1], I. Iskra[2], Z. Topcagic[1], and M. Remskar[2]
[1]University of Ljubljana, Faculty of Electrical Engineering, Ljubljana, Slovenia
[2]Institut Jozef Stefan, Ljubljana, Slovenia

We are developing nanoparticle detector for airborn particles. The detection principle is based on condensation of nanoparticles forming micron sized water droplets and detection of the droplets by a capacitive type nanodetector. We have successfully performed some experimental evaluations of the detection principle and are in the stage of optimization of several parts of the system. As shown ...

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