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.

La5Ca9Cu24O41 Layers as 1D Heat Spreaders for Thermal Management Solutions

C. Orfanidou, and J. Giapintzakis
Department of Mechanical and Manufacturing Engineering
University of Cyprus
Nicosia, Cyprus

This paper deals with the design of a viable thermal management solution using La5Ca9Cu24O41 layers for heat channeling. The simulations are carried out with the finite element method using COMSOL Multiphysics Heat Transfer Module. COMSOL 4.2 was used to model and optimize silicon devices. Malfunctioning elements on silicon devices are sometimes converted into hotspots resulting in the ...

Computational Acoustic Attenuation Performance of Helicoidal Resonators

W. Lapka
Poznan University of Technology
Poznan, Poland

This paper concerns the problem of obtaining proper acoustic attenuation performance through computations. COMSOL was used to solve acoustics systems with helicoidal resonators in the frequency domain. Based on the studies of insertion and transmission loss of helicoidal resonators, a high consistency between the results obtained by numerical calculations with experimental measurements was ...

Non Linear Mechanical and Poromechanical Analyses: Comparison with Analytical Solutions

M. Souley, and A. Thoraval
INERIS
Ecole des Mines
Parc de Saurupt, France

The long-term behaviour of the underground excavations is a social and economic challenge particularly in the contexts of post-mining or radioactive waste storage. Numerical modelings are currently used to understand and forecast the complex behaviour of rock mass around the underground cavities. In order to accurately perform these multiphysics modelings at high space and time scales, it is ...

Electro-Stimulating Implants for Bone Regeneration: Parameter Analysis on Design and Implant Position

Y. Su[1], R. Souffrant[1], D. Klüß[1], R. Bader[1], M. Ellenrieder[1], and H. Ewald[2]
[1]Department of Orthopaedics, University of Rostock, Rostock, Germany
[2]Department of General Electrical Engineering, University of Rostock, Rostock, Germany

A common clinical treatment is the application of alternating electromagnetic fields using a screw implant to the weak bone tissue within the femoral head, which speed up the bone regeneration in case of avascular necrosis of the femoral head . In our present work the bipolar induction screw system as the depicted ASNIS S-Series screw with integrated coil and electrodes were investigated. ...

Building Energy Simulation Using the Finite Element Method

J. van Schijndel[1]
[1]Eindhoven University of Technology, Eindhoven, The Netherlands

In order to predict, improve and meet a certain set of performance requirements related to the indoor climate of buildings and the associated energy demand, building energy simulation (BES) tools are indispensable. Due to the rapid development of FEM software and the Multiphysics approaches, it should possible to build and simulate full 3D models of buildings regarding the energy demand. The ...

Development of the Service Frame for SBS Tracker GEM and TENDIGEM Development

F. Noto[1], E. Cisbani[2], F. Librizzi[1], F. Mammoliti[3], C.M. Sutera[1]
[1]Istituto Nazionale Fisica Nucleare - Sezione di Catania, Catania, Italy; Dipartimento di Fisica ed Astronomia, Università di Catania, Catania, Italy
[2]Istituto Nazionale Fisica Nucleare - Sezione di Roma, Roma, Italy; Istituto Superiore di Sanità, Roma, Italy
[3]Istituto Nazionale Fisica Nucleare - Sezione di Catania, Catania, Italy; Dipartimento di Fisica ed Astronomia, Università di Catania, Catania, Italy

The Gas Electron Multiplier (GEM) technology has been proven to tolerate rate larger than 50 MHz/cm² without noticeable aging and to provide the sub-millimeter resolution on working chambers up to 45x45 cm² [1]. A new GEM tracker is under development for the upgrade of the SBS spectrometer in Hall A at Jefferson Lab. The chambers of the tracker have been designed in a modular way: each chamber ...

Upscaling of Heterogeneous Rock Properties via a Multiscale Image to Simulation Approach

S. Zhang[1], M. Pal[2], P. Barthelemy[1], M. Lei[1]
[1]Visualization Sciences Group, Burlington, MA, USA
[2]Shell International Exploration and Production, Rijswijk, The Netherlands

The mass and recoverability of oil and gas in unconventional reservoirs strongly depend on the understanding the petrophysical properties of the rocks at a large range of scales. Three-dimensional imaging is capable of unveiling the detailed microstructures within the rocks down to the nanometer scale. Using a multiscale imaging protocol, a Devonian shale rock sample with heterogeneities is ...

Piezoelectric Buzzer Optimization for Micropumps

A. Garcia[1], A. Marcus[1], F. Tejo[1], C. Precker[1], C. Moreira[2]
[1]Universidade Federal de Campina Grande, Campina Grande, PB, Brazil
[2]Instituto Federal de Alagoas, Maceio, AL, Brazil

Piezoelectric buzzers are low cost devices which can be used successfully as actuators in diaphragm-based micro-pumps. The buzzers are piezoelectric wafers (lead-zirconate-titanate-PZT) that are glued on a brass membrane and they are available within different sizes and thicknesses. For the best performance of a diaphragm pump, it is necessary to have a large displacement of the membrane. This ...

A MEMS Condenser Microphone for Consumer Applications

S. Kesari[1], A. Pandit[1], K. Mishra[1], Kaushal B. K.[1]
[1]Electronics and Communication Engineering, Nitte Meenakshi Institute of Technology, Bangalore, India

The MEMS microphone is also called microphone chip or silicon microphone.The pressure sensitive diaphragm is etched directly into a silicon chip by MEMS techniques and is usually accompanied with integrated preamplifier. Most MEMS microphones are variants of the condenser microphone design. The device consists of a polysilicon diaphragm suspended over a single crystal silicon backplate fabricated ...

Local Electroporation of Single Adherent Cells by Micro-Structured Needle Electrodes

K. K. Sriperumbudur[1], P. J. Koester[1], M. Stubbe[1], C. Tautorat[1], J. Held[2], W. Baumann[1], and J. Gimsa[1]
[1] University of Rostock, Chair of Biophysics, Gertrudenstr. 11a, 18057 Rostock, Germany
[2] Microsystem Material Laboratory, Department of Microsystems Engineering (IMTEK), University of Freiburg, Germany

In spite of its low throughput, Patch-Clamp is the established method for intracellular measurements of the transmembrane potential. To address this problem, we have developed new biosensor-chips with micro-structured needle electrodes (MNEs). MNE-penetration of single cells growing on the MNE-tips leads to a situation comparable to the whole-cell mode in classical Patch Clamp. MNE-penetration ...

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