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.

Analysis of TAP Reactors Procedures Using COMSOL

S. Pietrzyk[1], and G.S. Yablonsky[2]
[1]Unité de Catalyse et Chimie du Solide, Université des Sciences et Technologies de Lille, France
[2]Parks College, Saint Louis University, St. Louis, MO, USA

TAP (Temporary Analysis of Products) reactors are powerful instruments to study the kinetics of catalytic reactions. Their basic principle, exposition of evacuated solids of interest to narrow pulses containing very small amounts of gases, and measuring the concentrations of outgoing molecules permits to study practical catalysts under the conditions approaching those of molecular beam ...

Computational Fluid Dynamics Simulations of an Innovative System of Wind Power Generation

S. Carcangiu, A. Fanni, and A. Montisci
Department of Electric and Electronic Engineering
University of Cagliari
Cagliari, Italy

In this work an innovative wind power generation in urban areas is proposed. The generation system substitutes the roof of the building and it consists of a static part, the stator, and a moving part, called impeller, which is a centripetal turbine with vertical axis of rotation. Since the objective is to conveying the air flow in the stator, the logarithmic spiral has been chosen as the shape ...

3D FEM-analysis of a Micromachined Wind Sensor Based on a Self-heated Thermistor Array

A. Talic[1], S. Cerimovic[2], M. Mutapcic[2], R. Beigelbeck[1], and F. Keplinger[2]
[1]Institute for Integrated Sensor Systems, Austrian Academy of Sciences, Wiener Neustadt, Austria
[2]Institute of Sensor and Actuator Systems, Vienna University of Technology, Vienna, Austria

We present COMSOL-based analyses and design optimizations of a micromachined wind sensor. The sensor relies on eight germanium thermistors embedded in a thin silicon nitride membrane, where two orthogonally arranged ensembles, each consisting of four thermistors, are connected to form a double Wheatstone-bridge. In operation, each bridge is supplied by a constant current and the self-heating of ...

Using Optical Flow Tracing of MRI Flow Artifacts to Validate CFD Findings

R. H. Lauridsen, S. Ringgaard, and S. Alberg Thrysøe
Aarhus University Hospital
Aarhus, Denmark

The aim of this study is to use tracking of flow artifacts in Magnetic Resonance Imaging of fluids to validate CFD. Phase Contrast MRI will also be used for comparison. The correlation between flow of the fluid and movement of the artifacts is investigated using an aorta flow phantom, which is modeled from a human aorta and printed in thermo plastic. An Optical Flow algorithm is used to ...

Validation of a Simplified Model to Determine the Long-Term Performance of Borehole Heat Exchanger Fields With Groundwater Advection

S. Lazzari[1], A. Priarone[2], and E. Zanchini[1]
[1]University of Bologna, Department DIENCA, Bologna, Italy
[2]University of Genova, Department DIPTEM, Genova, Italy

Finite element simulations performed through COMSOL Multiphysics are used to study the long-term performance of BHE fields placed in a water-saturated porous soil subjected to groundwater movement. The heat transfer problem is written in a dimensionless form and the long-term time evolution of the mean surface temperature of the BHEs, sketched as cylindrical heat sources subjected to a regular ...

Evanescent Waves at the Interface Between Ear Canal and Otoacoustic Emission Probe

M. Zebian[1,2], J. Hensel [2], and T. Fedtke[2]
[1]Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
[2]International Graduate School of Metrology, Braunschweig, Germany

Otoacoustic emission (OAE) tests provide an objective examination of the cochlear function. However, the validity of OAE tests is affected negatively by calibration errors. This report sheds light on the evanescent waves arising at the interface between the OAE probe and the ear canal, and analyses the impact of minor eartip modifications on the acoustic length estimation of ear canals, using ...

Efficiency of Evacuated Tubular Solar Thermal Collector

J. Ma and X. Wei
Southeastern Louisiana University
Hammond, LA

Using COMSOL® 3.5a, models were created to simulate the heat transfer between the working fluid and the selective coating as well as the natural convection of the working fluid itself. In these models, a constant heat input on half of the selective coating facing the sun was considered as energy input from the sun, and the open end of the tube, where the working fluid can flow in and out of the ...

High Field Magnetic Diffusion into Nonlinear Ferrimagnetic Materials

J-W. Braxton Bragg[1], J. Dickens[1], A. Neuber[1], and K. Long[2]
[1]Center for Pulsed Power and Power Electronics, Texas Tech University, Lubbock, TX
[2]Dept. of Mathematics, Texas Tech University, Lubbock, TX

Ferrimagnetic based, coaxial nonlinear transmission lines (NLTLs) provide a means to generate sub-nanosecond risetime pulses (from nano-second input pulses) or megawatt level high power microwave oscillations, depending on the geometry, material, and external bias fields. This investigation uses the commercially available, finite element solver COMSOL to provide insight into pulse behavior. ...

Effect of Channel Width on Fuel Cell Performance Using 3D Modelling

R. Pushpangadan, S. S. Dimble, and S. P. Duttagupta
IIT Bombay
Maharasthra, India

A three Dimensional model of the PEM Fuel cell is implemented using COMSOL Multiphysics and the channel width is varied to study the performance.Effect of channel width on the performance of the cell is studied by varying the width of the channel and keeping channel width to rib ratio constant at 1. Rib width is the width of the GDL area which is not covered by the channel. All other parameters ...

Numerical Simulation of Rapid Magnetic Microfluidic Mixer by COMSOL Multiphysics

C. Y. Wen, and K. P. Leong
Department of Aeronautics and Astronautics
National Cheng Kung University,

Conclusions from this presentation were: * The ‘finger’ pattern increased the interface area between the ferrofluid and water * Both upstream and downstream channels achieved about a 95% mixing efficiency within 2 seconds * The predicted process agrees with experimental results * As the magnetic field intensity increases, the mixing process accelerated. This trend continue to magnetic field ...

2671 - 2680 of 3222 First | < Previous | Next > | Last