Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Design of heat flux microsensor assisted by COMSOL for the study of energy transfer on Si and Cu thin samples

L. Bedra, N. Semmar, A.-L. Thomann, R. Dussart, J. Mathias, and Y. Tessier
GREMI, CNRS-Université d'Orléans, Orléans, France

A commercial heat probe is used for energy transfer measurements on copper and silicon substrates. To do so, the micro sensor has to be calibrated under high vacuum (~10-7 mbar), using a homemade black body as a heat source.Although the HFM is cooled at 5 oC, the solid surface temperature is unknown as the thermal contact resistance. Thus, COMSOL simulations are also used to obtain reliable ...

Temperature Distribution Study of Composite Germanium Detector

M. Wolf1, J. Kojouharova2, I. Kojouharov2, T. Engert2, J. Gerl2, J. Groß1, and H.-J. Wollersheim2
1Hochschule Darmstadt, University of Applied Sciences, Darmstadt, Germany
2Gesellschaft für Schwerionenforschung GmbH, Darmstadt, Germany

Temperature distributions of cooled Germanium (Ge) detectors are calculated by the COMSOL Multiphysics software in order to determine the necessary cooling power of an electromechanical cooling engine. For a single Ge-crystal, heat losses of 2.5 W are determined, which increase to 5.7 W for a composite detector with three Ge-crystals.The energy transfer may be reduced substantially by a heat ...

Study of a Silicon Photodetector Thermal Stabilization using a Peltier Cell

E. Foschi1, C. Guandalini2, G. Levi1, L. Quadrani1, C. Sbarra 1,3, and M. Zuffa2
1Department of Physics, University and INFN, Bologna, Italy
2INFN, Bologna, Italy
3Centro Studi e Ricerche E.Fermi, Roma, Italy

In recent years, a new type of silicon photon detection devices (SiPM) has been developed. These devices have advantages in comparison to normal photomultiplier tubes (PMT), but being made by an array of avalanche photo diodes operated in Geiger mode, they are much more sensitive to temperature changes than standard PMTs. Typical SiPM gains vary from 3 to 5 percent per degree Centigrade. In space ...

Convective Movements in an Electrolyser

B. Morel1, P. Namy2, C. Belhomme1, and I. Crassous3
1Comurhex, Pierrelatte, France
2SIMTEC, Grenoble, France
3LI2C, Paris, France

Modeling electrolysers is a challenge because of the strong coupling between electrical, thermal and CFD equations. Indeed the electrical conductivity of the electrolyte varies with the temperature, which in turn depends on the heat dissipated by the Joule effect and anode over-voltage.In the present study, the fluid velocity values are computed near the electrodes using a diphasic level set ...

Dual Solutions for Viscous Mixed Convection Flows in a Vertical Circular Duct: A Numerical Benchmark

S. Lazzari1, A. Barletta1 , E. Magyari1,2, and F. Piccinini3
1Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale (DIENCA), University of Bologna, Bologna, Italy
2Institute of Building Technology, ETH - Zürich, Zürich, Switzerland
3Biomedical Engineering, Engineering School of Cesena, Cesena, Italy

Forced and free convection flow in a vertical isothermal circular duct is studied by taking into account the internal heating due to viscous dissipation. The momentum and energy balance equations lead to a nonlinear boundary value problem that is solved numerically by means of the finite-element software COMSOL Multiphysics.For any prescribed value of the average velocity smaller than a maximum, ...

Implementation of EC-NDT for in Depth Detection of Defects in Metallic Plates

M. Cacciola, S. Calcagno, D. De Carlo, F. Laganà, G. Megali, F. C. Morabito, D. Pellicanò, and M. Versaci
Department of Informatics, Mathematics, Electronics and Transportations (DIMET) - "Mediterrane" University of Reggio Calabria, Reggio Calabria, Italy

Eddy Current Non Destructive Testing is exploited to evaluate the structural integrity of metallic objects. The aim of this paper is to detect defects located in depth within the inspected object; within this framework, we studied the modelling of exciting coils useful to detect structural flaws. The simulations have been carried out by considering the movement of the coil over a structural steel ...

Mathematical Modeling of Atheroma Plaque Deformation using COMSOL Multiphysics

N. El Khatib1, S. Genieys1, M. Zine2, and V. Volpert1
1Institut Camille Jordan, Université Claude Bernard, Lyon, France
2Département Maths & Informatique, Ecole Centrale de Lyon, Lyon, France

The development of atherosclerosis leads to the formation of an atheroma plaque which takes place in the artery. This plaque is composed of two parts: a lipid deposit and a fibrous cap. The fibrous cap covers the lipid deposit and isolates it from the blood flow. The blood flow that circulates in the artery modifies the geometry of the atheroma plaque and can cause dangerous effects, such as a ...

Image Denoising and Segmentation using COMSOL Multiphysics

F. Zama
Department of Mathematics, Bologna University, Bologna, Italy

Partial differential equations have recently become popular and useful tools for several image processing tasks such as image de-noising and segmentation.In this work, we implement a unified image de-noising and segmentation approach which is based on a nonlinear diffusion equation with a reactive term for achieving edge preserving smoothing and segmentation. This model is highly nonlinear and ...

Vibration Analysis - Gullfaks C Knock Out Drum

S. Sandström
SSM Engineering, Stenungsund, Sweden

An eigenvalue as well as a harmonic response analysis is performed on the Gullfaks C, Knock Out Drum (KOD) including some of the connecting pipe systems. The vibration behavior of two new choke valves and their specific connection to the KOD are of special interest. The main concern is the low frequency induced vibration as a consequence of the platform movements. A frequency band between 0-20 Hz ...

Simulation of a Micro-Analytical Device for Adsorbing Substances from a Fluid

R. Winz1, A. de los Rios Gonzalez2, E. von Lieres3, M. Schmittel2, and W. Wiechert1
1Department of Simulation, University of Siegen, Siegen, Germany
2Department of Organic Chemistry, University of Siegen, Siegen, Germany
3Institute of Biotechnology, Research Centre Jülich, Jülich, Germany

T- or Y-shaped microfluidic channels are chemical measurement devices that have become popular in recent years. Using such microdevices gives a better control of the fluid behavior and the chemical reaction kinetics, due to the small quantity of fluid.The concept of the T-Sensor as state-of-the-art is used to determine coupled processes of diffusion and reaction within a small-scaled system on a ...

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