Presentazioni e Articoli Tecnici

In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Voltammetric Performance of Nanometer Interdigitated Electrodes

X. Yang1, and G. Zhang1,2
1Micro/Nano Bioengineering Laboratory, Faculty of Engineering, The University of Georgia, Athens, GA, USA
2Nanoscale Science and Engineering Center, Faculty of Engineering, The University of Georgia, Athens, GA, USA

To explore the use of nanometer-scale interdigitated electrodes (IDEs) in affinity-based biosensors, we investigated the voltammetric behavior of interdigitated electrodes (IDEs) at various electron-transfer-rate constants (i.e., the k0 values) with the consideration of electrical double layer (EDL), and the relationship between the limiting current density and k0 value. Results show that the ...

Modeling Implementation of Smart Materials such as Shape Memory Alloys and Electro-Active Metamaterials

Manuel Collet
Femto-STInstitute UMR CNRS 6174 Dept Applied Mechanics,
Besancon, France

Manuel Collet is a member of the Department of Applied Mechanics of the FEMTO-ST Institute. He graduated with a degree in Mechanical Engineering from Ecole Centrale de Lyon in 1992 and obtained his PhD in 1996 about Active control of vibrating structures by mean of semi distributed piezoelectric patches. His main research lines currently involve smart structures and active Control, MEMS ...

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, ...

An Analysis of Spin-Diffusion Dominated Ferrofluid Spin-Up Flows in Uniform Rotating Magnetic Fields

S. Khushrushahi[1], A. Guerrero[2], C. Rinaldi[3], and M. Zahn[1]
[1]Massachusetts Institute of Technology, Cambridge, MA
[2]Univeridad Industrial de Santander, Bucaramanga, Colombia
[3]University of Puerto Rico, Mayaguez, Mayaguez, PR

This work analyzes the spin-diffusion dominated explanation for spin-up bulk flows in ferrofluid filled cylinders, with no free surface, subjected to a uniform rotating magnetic field. COMSOL results are compared to experimental results and analytical results. Simulating ferrofluid spin-up flows have many subtleties, especially when using a single domain region to model the ferrofluid cylinder ...

Electro Magnetic Wave Simulation in Fusion Plasmas

O. Meneghini[1], and S. Shiraiwa[1]
[1]Plasma Science and Fusion Center, Massachusetts Institute of Technology, Massachusetts, USA

Fusion is a form of nuclear energy which has impressive advantages from the point of view of fuel reserves, environmental impact and safety. If successful, fusion energy would ensure a safe, resource conserving, environmentally friendly power supply for future generations. In a world wide cooperation to achieve this goal, seven parties including Europe, Japan, Russia, USA, China, South-Korea and ...

Investigation of Stability of Current Transfer to Thermionic Cathodes

M. Benilov, and M. Faria
Departamento de Física, Universidade da Madeira, Funchal, Portugal

Current transfer from high-pressure arc plasmas to thermionic cathodes may occur in a diffuse mode, when the current is distributed over the front surface of the cathode, or in a spot mode, when most of the current is localized in one or more small areas. Spectra of perturbations of 3D steady-state current transfer to thermionic cathodes of a high-pressure argon arc have been computed in the ...

FSWR Microlith Performance Metrics Assessment

R. Cummings[1], J. Knox[1]
[1]NASA, Marshall Space Flight Center, Huntsville, AL, USA

COMSOL Multiphysics® has been used to develop assessment tools for the NASA-sponsored Precision Combustion, Inc. (PCI) regenerable Microlith®- based adsorber modules. The Full Scale Water Removal (FSWR) PCI Microlith® was initially modeled for comparison with exit velocity data, measured while exterior canister was removed. Measurement data as well as flow analysis showed that the velocity ...

Mobility of Catalytic Self-Propelled Nanorods Modeling with COMSOL Multiphysics®

F. Lugli[1] and F. Zerbetto[1]
[1]Department of Chemistry “G. Ciamician”, Università di Bologna, Bologna, Italy

A small particle or a nano-sized object placed in a liquid is subject to random collisions with solvent molecules. The resulting erratic movement of the object is known as Brownian motion, which, in nature, cannot be used to any practical advantage both in natural systems (such as biomolecular motors) or by artificial devices. If energy is supplied by external source or by chemical reactions, ...

Level Set Method for Fully Thermal-Mechanical Coupled Simulations of Filling in Injection and Micro-Injection Molding Process

M. Moguedet[1], R. Le Goff[1], P. Namy[2], and Y. Béreaux[3]
[1]Pôle Européen de Plasturgie, Bellignat, France
[2]SIMTEC, Grenoble, France
[3]INSA de Lyon, Site de Plasturgie, Bellignat, France

In this work we tackle a more theoretical aspect of micro-injection molding, to better understand physics during the process, through numerical simulations of cavity filling. We developed a two phase flow approach by the use of COMSOL Multiphysics®. In a first step, a Level Set model is applied to several configurations: Newtonian and non Newtonian fluid (Cross viscosity law), coupled with a ...

Stability and Bifurcation of Cathode Arc Attachment in AC Operated High-Intensity Discharge Lamps

A. Lenef
Osram Sylvania

High-intensity discharge (HID) lamps are highly-efficient light sources with many applications. Depending on the dimensions of the electrode, lamp current, and waveforms, the plasma may attach to the cathode in a diffuse mode, that covers the electrode tip surface, or a localized mode where heating and current transfer occur in a local region of the electrode surface. The localized mode is ...

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