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.

Ventilation System of a Microwave Assisted Drying Kiln

A.-G. Ghiaus[1], M.-A. Istrate[1], A. Georgescu[1]
[1]Technical University of Civil Engineering, Bucharest, Romania

The paper presents the analysis and optimization of the ventilation system inside of a drying lumber kiln. As with any part of the manufacturing process, improper drying techniques cause quality degradation and considerable amount of energy loose. The improvement and optimization of air distribution systems in drying kilns contributes to the preservation of the wood quality. The performance of ...

Modeling of HTPEM Fuel Cell Start-Up Process by Using COMSOL Multiphysics

Y. Wang[1], D. Uwe Sauer[1]
[1]Electrochemical Energy Conversion and Storage Systems, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Aachen, Germany

HTPEM fuel cells are considered to be the next generation fuel cells. The electrochemical kinetics for electrode reactions are enhanced by using PBI membrane at an operation temperature between 160-180 °C comparing to LTPEM fuel cells. But starting HTPEM fuel cells from room temperature to an operation temperature is a challenge. In this work, using preheated air to heat up the fuel cells ...

Numerical Study of a DC Electromagnetic Liquid Metal Pump: Limits of the Model

N. Kandev[1]
[1]Institut de recherche d'Hydro-Québec, Shawinigan, QC, Canada

This work presents the results of a 3D numerical magneto-hydrodynamic (MHD) simulation of an electromagnetic DC pump for liquid metal using a rectangular metal flow channel subjected to an externally imposed transversal inhomogeneous magnetic field. In this study. 3D numerical simulation based on the finite element method was carried out using the computer package COMSOL Multiphysics 3.5a. The ...

Numerical Simulation of pH-sensitive Hydrogel Response in Different Conditions

M.K. Ghantasala[1], B.O. Asimba[1], A. Khaminwa[1], K.J. Suthar[2], D.C. Mancini[3]
[1]Department of Mechanical and Aeronautical Engineering, Western Michigan University, Kalamazoo, MI, USA
[2]Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
[3]Physical Sciences and Engineering, Argonne National Laboratory, Argonne, IL, USA

The understanding of pH-sensitive hydrogel swelling response in different buffer environmental condition is essential for its use in different practical applications. This necessitates its simulation in steady state and transient conditions. This paper mainly deals with the details of the numerical simulation performed by developing coupled formulation of chemo-electro-mechanical behavior of ...

Flow-induced Vibrations of the Uvula and its Implication on Snoring

J. Xi[1], Q. M. Mohamad[1], Y. E. Yuan[1], J. Rohlinger[1]
[1]Mechanical and Biomedical Engineering, Central Michigan University, Mount Pleasant, MI, USA

1. Flow-induced uvula deformation considerably altered the flow dynamics inside the nose. 2. For a weak soft palate, complete flow occlusion can occur (sleep apnea). 3. Vibration of the airway structures is crucial to better understand snoring generation mechanisms and breathing-related disorders.

Finite Element Evaluation of Surface Acoustic Wave Reflection and Scattering from Topographic Irregularities Comparable with the Wavelength

S. Yankin[1,2], S. Suchkov[2], S. Nikitov[2,3], B. Sveshnikov[2], I. Shatrova [2]
[1]Joint International Laboratory LICS/LEMAC, IEMN UMR CNRS 8520, EC Lille,Villeneuve d’Ascq, France
[2]Saratov State University, Saratov, Russia
[3]Institute of Radio-engineering and Electronics, Russian academy of Science, Moscow, Russia

Design of SAW devices needs the accurate study of the scattering fields, arising from the interaction of SAW with topographic irregularities. To solve this problem FE methods very perspective, because with its help one can take into account the actual geometry of the electrodes and reflectors. This work describes results of original time domain calculation of 2D SAW scattering fields in delay ...

An Assessment of the Suitability of the Body and Adult Head Coils for Transmission during Paediatric Magnetic Resonance Imaging

G.R. Cook[1], M.J. Graves[1], F.J. Robb[2], D.J. Lomas[1]
[1]Department of Radiology, University of Cambridge, Cambridge, United Kingdom
[2]General Electric Healthcare Coils, Aurora, Ohio, USA

MRI offers many advantages over other modalities and its lack of ionizing radiation is important for children, but can be limited by the radio-frequency (RF) coils available. This work calculates Specific Absorption Rate (SAR) and homogeneity of the RF transmit field (B1+) when imaging infants in adult coils. Two birdcage-type coils were loaded by a tissue model and their B1+ homogeneities ...

Residual Stresses and Failure Probability of Solid Oxide Fuel Cells Due to the Sintering Process

F. Greco[1], J. van Herle[1], A. Nakajo[1]
[1]FUELMAT Group, Institute of Mechanical Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

A solid oxide fuel cell (SOFC) is composed of four layers (anode, electrolyte compatibility layer and cathode) of different ceramic materials. The anode layer is produced by tape casting, the remaining layers are deposited by screen-printing. The layers are sintered together at high temperatures. During heating up and cooling down (manufacturing process), stresses are generated in the layers due ...

Simulated Rheometry of a Nonlinear Viscoelastic Fluid

A. Czirják[1], Z. Kőkuti[1], G. Tóth-Molnár[1], P. Ailer[2], L. Palkovics[2], G. Szabó[1]
[1]University of Szeged, Szeged, Hungary
[2]Kecskemét College, Kecskemét, Hungary

In certain cases, the accuracy of measurements with a rotational rheometer can be influenced by inefficient thermal management, by the heat generated in the sample, or by rod-climbing due to the Weissenberg effect. We investigate the effect of these phenomena with simulations in COMSOL Multiphysics®. Our model is based on the axial symmetric (2D) formulation of the two-phase flow with the ...

Simulation of Beam Propagation with Two-photon Absorption in Semiconductor Materials

Syuhei LEE et al.[1]

[1]Chiba University, Chiba, Chiba, Japan

We have studied ultrafast all-optical switching devices based on two-photon absorption, which are expected to have ultrafast response less than 1 ps in wideband and to be independent of polarization of light. In our laboratory, we have obtained the analytical solution for the equation of light propagation in our model that the two-photon absorption occurs in a sample. Though we have used the ...