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 a Modular Die Stamp for Micro Impact Extrusion

A. Schubert[1][2], R. Pohl[1], and M. Hackert[1]
[1]Chair Micromanufacturing Technology, Faculty of Mechanical Engineering, Chemnitz University of Technology, Chemnitz, Germany
[2]Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany

Micro impact extrusion is investigated at Chemnitz University of Technology as a potential procedure for large area machining of micro cavities within the scope of the SFB/Transregio 39 PT-PIESA of the German Research Foundation. Applying impact extrusion micro forming is done by material flow opposite to the effective direction of the force into the structure of the tool. Therefore no structured ...

Simulation of the Turbulent Flow in HEV Static Mixers : Mixing of Ethanol with Gasoline

A. Eissa[1]
[1]Department of Chemical Engineering, Cairo University, Giza, Egypt

Mixing is a typical unit operation that occurs almost in all chemical industries. Static – alternatively termed motionless – mixers are being widely used due to their low power consumption, low capital investment, minimal maintenance costs and versatility. The traditional helical mixing element is mainly used for in-line blending under laminar and transitional flow conditions. The ...

Low Frequency Analysis of Small Rooms by Means of a Finite Element Model

P. Bonfiglio, and A. Farnetani
Università degli Studi di Ferrara

The main object of this paper is the determination of the impulse response, in the low frequency range, for calculating the reverberation time and the energetic parameters in this space. An absorbing material is modelled by using the propagation of sound waves in an equivalent fluid. The results of this Finite Element model are compared with experimental measurements of impulse responses ...

Linearmotoren zur Ventilsteuerung von Verbrennungsmotoren

R. Wislati[1], H. Haase[1], and C. Hartwig[2]
[1] Leibniz Universität Hannover, Institut für Grundlagen der Elektrotechnik und Messtechnik
[2] TRW Automotive GmbH, Engine Components

Zur Optimierung von Verbrennungsmotoren hinsichtlich Kraftstoffverbrauch, Abgasverhalten und Durchzugsfähigkeit wird der Einsatz einer variablen Ventilsteuerung (VVS) untersucht. Eine VVS wird unter Anderem erreicht mit dem Einsatz von elektromagnetischen Aktuatoren (EMA). Im vorliegenden Beitrag sind zwei EMA-Ansätze präsentiert. Bei dem ersten handelt es sich um einen elektromagnetischen ...

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 ...

Stabilised Finite Element Modelling of Oldroyd-B Viscoelastic Flows

T.J. Craven, J.M. Rees, and W.B. Zimmerman
University of Sheffield

The Oldroyd-B family of viscoelastic fluids are notoriously difficult to model numerically. Standard Galerkin finite element methods are prone to numerical oscillations, and solutions break down as fluid elasticity increases. The situation can be remedied to a certain degree however through the addition of weak stabilisation terms to the Galerkin formulation. We present a stabilised ...

Laminar Thermal Mixing in Coating Flows

A. Haas[1], M. Scholle[1], A. Aksel[1], H.M. Thompson[2], R.W. Hewson[2], and P.H. Gaskell[2]

[1]Department of Applied Mechanics and Fluid Dynamics, University of Bayreuth, Bayreuth, Germany
[2]School of Mechanical Engineering, University of Leeds, Leeds, United Kingdom

Heat transfer in a plane shear flow configuration consisting of two infinitely long parallel plates is considered. In laminar flows over undulated substrates eddies can be generated due to the kinematical constraints. A closed form analytical solution for the velocity field, based on lubrication theory as well as a semi-analytic solution for the temperature field is derived for the creeping flow. ...

COMSOL Multiphysics® as a General Platform for the Simulation of Complex Electrochemical Systems

A. Lavacchi[1]
[1]Department of Chemistry, University of Firenze, Sesto Fiorentino, FI, Italy

Microelectrodes demonstrate that modeling is crucial for understanding the behavior of complex electrochemical systems. The use of the finite element methods in electrochemistry may be of much more general interest for its ability to handle complex geometries. In this context a software such as COMSOL Multiphysics® allows a straightforward way to the set up models including coupling of ...

Modellierungstechniken zur Simulation mikromechanischer Systeme am Beispiel eines Drehratesensors

D. Krieg
FHT Esslingen, Versorgungstechnik und Umwelttechnik

Am Beispiel eines mikromechanischen Drehratesensors wird auf die Besonderheiten bei der Modellierung und Simulation mikromechanischer Systeme eingegangen: • Balkenmodellierung • Ortsabhängige Materialeigenschaften • Elektrostatikkopplungen Diese Modellierungstechniken werden an einfachen Beispielen (Balkenmodellierung einer U-Feder, Veränderung der relativen Permeabilität durch ...

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