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.

Reliability Testing for the Next Generation of Microelectronic Devices

J. Plawsky, W. Gill, M. Riley, J. Borja, and B. Williams
Rensselaer Polytechnic Institute, Troy, NY, USA

Understanding and predicting the reliability of new generations of high and low-k dielectrics is increasingly important for gate oxides and interlayer dielectrics as both films have become thinner and scaling of device operating voltages has not kept pace with the decrease in the size of the dielectrics. We have developed a series of COMSOL-based mass transfer-based models that have proven to ...

Hydro-Mechanical Modelling of a Shaft Seal in a Deep Geological Repository

D. Priyanto
Atomic Energy of Canada Limited, Pinawa, MB, Canada

The hydro-mechanical (HM) numerical simulation of a shaft seal installed at a fracture zone in a hypothetical host rock using COMSOL is presented. Two different stages are considered in the numerical modelling. Stage 1 simulates the groundwater flow into an open shaft. Stage 2 simulates the groundwater flow after installation of shaft sealing-components. The shaft sealing components include: ...

Experiments and Simulations for Optical Controlled Thermal Management on the Nanometer Length Scale

F. Garwe1, U. Bauerschäfer2, A. Csaki1, A. Steinbrück1, A. Weise3, W. Paa1, and W. Fritzsche1
1Institute of Photonic Technology Jena, Jena, Germany
2GmBU, Halle, Germany
3Institute of Human Genetics and Anthropology, Friedrich Schiller University, Jena, Germany

We show experimentally that the energy of femtosecond laserlight pulses with specific wavelength can be very efficiently absorbed by 30 nanometer gold nanospheres without ablation or destruction.In this way, nanospheres are usable as heat conversion tools on the nanometer length scale. The reason is that excited plasmon-polariton resonances are damped by electron-electron, electron-phonon, ...

Expanding Your Materials Horizons

R. Pryor[1]
[1]Pryor Knowledge Systems, Inc. (COMSOL Certified Consultant), Bloomfield Hills, Michigan, USA

Materials and their related properties are intrinsically fundamental to the creation, development and solution of viable exploratory models when using numerical analysis software. In many cases, simply determining the location, availability and relative accuracy of the necessary material parameters for the physical behavior of even commonly employed design materials can be very difficult and time ...

Microfluidic Design of Neuron-MOSFET based on ISFET

A. Jain[1], and A. Garg[2]
[1]BITS Pilani, Goa, India
[2]Bhartiya Vidyapeeth College, New Delhi, India

In this paper we suggest a device which combines the operation of a neuron-MOS and an ISFET. An ISFET is an ion-sensitive field effect transistor used to measure ion concentrations in a solution; when the ion concentration changes, the current through the transistor changes accordingly. A voltage between substrate and the oxide surfaces arises due to an ions sheath. It contains a conventional ...

Numerical Simulation of Crystallinity Distribution Developed In the Extrusion of Thick Walled Polypropylene Pipe

R. D. Wilcox1, and J. Collier2
1Chemistry Department, Lincoln Memorial University, Harrogate, TN, USA
2Chemical Engineering Department, Florida State University, Tallahassee, FL, USA

In a numerical simulation for crystallinity distribution, a 36 cm diameter polypropylene pipe with 3.7 cm wall thickness consisting of 3 subdomains that include a die, cooling box, and take-off section was modeled in a 2D axisymmetric geometry using COMSOL Multiphysics.The generalized heat transfer module was used to solve for the temperature distribution in the flowing melt using conductive and ...

Ignition Process of Microplasmas

H. Porteanu, and R. Gesche
Ferdinand-Braun-Institut für Höchstfrequenztechnik, Berlin, Germany

Microplasmas at atmospheric pressure are required in many applications, where treatments in normal ambient, with spatial resolution, are important. The interest on such miniaturized sources has increased due to the availability of a new generation of microwave sources based on high power GaN transistors. The present work deals with a simulation of the plasma formation after the application of the ...

Three Dimensional Numerical Study of the Interaction of Turbulent Liquid Metal Flow with an External Magnetic Field

G. Pulugundla[1], M. Zec[2], and A. Alferenok[3]
[1]Institute of Thermodynamics and Fluid Mechanics, Ilmenau University of Technology, Ilmenau, Germany
[2]Department of Advanced Electromagnetics, Ilmenau University of Technology, Ilmenau, Germany
[3]Electrothermal Energy Conversion Group, Ilmenau University of Technology, Ilmenau, Germany

Lorentz Force Velocimetry (LFV) is a non-contact measurement technique used to determine flow rates in electrically conducting fluids by exposing the flow to an external magnetic field and measuring the Lorentz force acting on the magnet system. Typically, for LFV applications real and complex permanent magnet systems with inhomogeneous magnetic fields interact with the fluid. In this paper, ...

Thermal Exchange Modelling on Hydrogen Plasma Reactor Walls

A. Michau, F. Silva, K. Hassouni, and A. Gicquel
Laboratoire d’Ingénierie des Matériaux et des Hautes Pressions, Villetaneuse

A reduced equivalent plasma model is proposed for thermal dissociation of molecular hydrogen, which allows a detailed description of atomic hydrogen recombination. This model, implemented with COMSOL Multiphysics, also accounts for surface temperature and thermal exchange on cavity walls. A self-consistent model previously developed in our laboratory has enabled us to determine that, at ...

Modeling Materials through a Phase Transition: Using COMSOL Multiphysics and Applying Physics First Principles Techniques

R. W. Pryor
Pryor Knowledge Systems, Inc., Bloomfield Hills, MI, USA

This paper presents a new phase transition model that is easily created and runs rapidly. It is designed so that the modeler can determine immediately the relative accuracy of the end result by use of the first principles of physics.Phase transitions are readily observable in many commonly utilized engineering materials. In fact, most modern devices and/or tools employ a phase transition in their ...

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