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.

Dynamic Multi-Phase Modelling and Optimisation of Fluid Jet Polishing Process

A. Beaucamp[2], R. Freeman[2], and Y. Namba[1]
[1]Chubu University, Kasugai, Japan
[2]Zeeko Ltd, Coalville, UK

In the Fluid Jet Method, a polishing fluid is compressed and delivered through a nozzle, allowing the spot area to become continuously replenished with abrasives and coolant. Process parameters include: Abrasive type and concentration, Inlet pressure, Nozzle diameter, Impingement angle, Surface feed of spot. The simulation uses COMSOL’s turbulent 2-phase flow model, with the incompressible ...

Topology Optimization of Dielectric Metamaterials Based on the Level Set Method Using COMSOL Multiphysics

M. Otomori, and S. Nishiwaki
Kyoto University
Japan

This presentation shows a level set-based topology optimization method for the structural design of negative permeability dielectric metamaterials incorporating the level set boundary expression based on the concept of the phase field method, and its optimization algorithm implemented by COMSOL Multiphysics. Furthermore, several design examples are provided to confi rm the usefulness of the ...

COMSOL Multiphysics in Modeling MOCVDs

Y. Shimogaki
Shimogaki Laboratory
Department of Materials Engineering,
The University of Tokyo
Japan

This paper showed that: * SAG-MOCVD is a powerful tool to fabricate OEICs and is also effective to extract true surface kinetics during MOCVD. * GaAs-MOCVD process was examined by SAG analysis where it was seen that below 600ºC, surface kinetics shows non-linear behavior. * Surface reaction rate constant of adsorbed species was constant against offset angle, while adsorption equilibrium ...

Acoustic Streaming of a Sharp Edge

M. Ovchinnikov[1]
[1]Alcon Research Ltd., Lake Forest, CA, USA

Anomalous acoustic streaming is observed from sharp edges of vibrating solid bodies in fluids. The streaming velocities can be orders of magnitude higher than expected from the Rayleigh streaming at similar amplitudes of vibrations. Acoustic velocity of a fluid relative to a solid body diverges at a sharp edge giving rise to a localized time-independent body force acting on the fluid. The ...

Simulation of a Single-Sided Magnetic Particle Imaging Device with COMSOL Multiphysics®

K. Gräfe[1], J. Mrongowius[1], T.M. Buzug[1]
[1]Institute of Medical Engineering, University of Luebeck, Germany

For the MPI imaging process, superparamagnetic iron oxide nanoparticles (SPIONs) are used as tracer material. The particles are excited by a sinusoidally varying magnetic field. A field-free point (FFP) is generated by the superposition of two magnetic fields. The FFP is important for the imaging process, since only the SPIONs in the FFP and its direct neighbourhood are essential for the ...

The Effect of Space Charge due to the Auto-Ionization of Neutral, Hydrogenic States in Point-Contact Germanium Detectors at MilliKelvin Temperatures - new

D. Faiez[1], N. Mirabolfathi[1], B. Sadoulet[1], K. M. Sundqvist[2]
[1]Department of Physics, University of California - Berkeley, Berkeley, CA, USA
[2]Department of Electrical & Computer Engineering, Texas A&M University, College Station, TX, USA

A class of semiconducting detectors, operated at temperature T~50mK, has direct application to the search for dark matter particle, when are able to simultaneously measure both the ionization and phonons created by particle interactions. We explore the effect of space charge accumulation in a germanium p-type point contact detector which arises due to the auto-ionization of hydrogenic ...

Finite Element Simulations of Pulsed Thermography Applied to Porous Carbon Fibre Reinforced Polymers - new

G. Mayr[1], B. Plank[1], J. Suchan[1], G. Hendorfer[1]
[1]University of Applied Sciences, Wels, Austria

Porosity in carbon fiber reinforced polymers (CFRP) as shown in figure 1 degrades the engineering performance, especially the interlaminar shear strength [1]. In the aviation industry a porosity level of 2.5 % has become the maximum level of acceptance. The presence of air-filled voids (pores) has strong effects on the thermal diffusivity. Pulsed thermography offers a rapid, non-destructive ...

Multi-Layers Surface Coil Design: Geometry Optimization - new

S. Aissani[1], L. Guendouz[2]
[1]CRM2, Institut Jean Barriol, University of Lorraine, Vandoeuvre-lès-Nancy, France
[2]Mesures et architectures électroniques, University of Lorraine, Vandoeuvre-lès-Nancy, France

Nuclear Quadrupole Resonance (RQN) is a radio frequency (RF) spectroscopic technique that is used to detect quadrupole nuclei such as Nitrogen-14. NQR was found to be a good candidate for detecting narcotics, explosives and medicines [1]. However, due to its low sensitivity the use of NQR is still limited. One way to increase the sensitivity is to improve the RF coil by means of a better RF ...

Three-Dimensional Percolation Properties Simulation of a Marine Coating Based on Its Real Structure Obtained from Ptychographic X-Ray Tomography - new

B. Chen[1], M. Guizar-Sicairos[2], G. Xiong[1], L. Shemilt[1], A. Diaz[2], J. Nutter[1], N. Burdet[1], S. Huo[1], F. Vergeer[3], A. Burgess[4], I. Robinson[1]
[1]London Centre for Nanotechnology, University College London, London, UK
[2]Paul Scherrer Institute, Villigen, Switzerland
[3]AkzoNobel Co. Ltd., Sassenheim, Netherlands
[4]AkzoNobel (UK) Co. Ltd., Tyne and Wear, UK

We present quantitative nano-scale analysis of the 3D spatial structure of an anticorrosive aluminium epoxy barrier marine coating obtained by ptychographic X-ray computed tomography (PXCT) [1-3]. We then use COMSOL Multiphysics® software to perform simulations on the acquired real 3D structure to demonstrate how percolation through this actual 3D structure impedes ion diffusion in the ...

Analysis of Flow in a Microfluidic Device: Pressure Drop, RTD and Mixing

A. Kulkarni[1]
[1]NCL, Pune, Maharashtra, India

Continuous flow reactors are recently being used for lab scale synthesis as well as pilot scale manufacturing of high value low volume chemicals. Here we present our work on a new configuration of flow reactor that includes several 1800 bends and yet a varying radius of curvature thereby yielding continuous change in the direction of streamlines. Experiments as well as simulations (in COMSOL ...

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