Veröffentlichungen und Präsentationen

Hier finden Sie Veröffentlichungen und Präsentationen der weltweit stattfindenden COMSOL-Konferenzen. In diesen präsentieren Ihre Fachkollegen ihre neuesten mit COMSOL Multiphysics entwickelten Produkte und Ideen. Die Forschungsthemen umfassen ein weites Feld von Industrien und Anwendungsbereichen, die von Mechanik und Elektronik über Strömungen bis zur Chemie reichen. Nutzen Sie die Quick Search, um die zu Ihrem Forschungsbereich passenden Präsentationen zu finden.

Solid-Liquid Phase Change Simulation Applied to a Cylindrical Latent Heat Energy Storage System

D. Groulx[1], and W. Ogoh[1]

[1]Mechanical Engineering Department, Dalhousie University, Halifax, Nova Scotia, Canada

One way of storing thermal energy is through the use of latent heat energy storage systems. One such system, composed of a cylindrical container filled with paraffin wax, through which a copper pipe carrying hot water is inserted, is presented in this paper. It is shown that the physical processes encountered in the flow of water, the heat transfer by conduction and convection, and the phase ...

Implementation of a Paraxial Optical Propagation Method for Large Photonic Devices

J.E. Toney[1]

[1]Pennsylvania State University Electro-Optics Center, Freeport, Pennsylvania, USA

We demonstrate the use of COMSOL Multiphysics with MATLAB to model signal generation in wide-bandgap semiconductor radiation detectors. A quasi-hemispherical detector design is compared with a simple, planar detector. Results show that the quasi-hemispherical design can simply and effectively compensate for the poor hole transport of most compound semiconductor materials. In this paper we present ...

Mathematical Modeling of a Lithium Ion Battery

R. E. White[1], and Long Cai[2]
[1]R.E. White & Associates LLC, Columbia, South Carolina, USA
[2]Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina, USA

The existing lithium ion battery model in COMSOL’s Multiphysics  software is extended to include the thermal effects. The thermal behavior of a lithium ion battery is studied during the galvanostatic discharge process with and without a pulse. The existing lithium ion battery model in COMSOL 3.5a is extended by adding an energy balance and the temperature dependence of properties of ...

Newtonian and Non-Newtonian Blood Flow over a Backward-Facing Step: Steady-State Simulation

M.W. Siebert[1], and P.S. Fodor[1]
[1]Physics Department, Cleveland State University, Cleveland, Ohio, USA

In this work, the fluid flow over a 2D backward-facing step is analyzed in order to provide a case study for the use of different models for the blood dynamic viscosity in COMSOL Multiphysics. Three non-Newtonian models, as well as the Newtonian model are used to study the shear stresses and the reattachment length as a function of the fluid speed. The non-Newtonian models used in this study are ...

Modeling Optical Nanoantenna Arrays with COMSOL Multiphysics

Z. Liu[1], X. Ni[1], and A. Kildishev[1]
[1]School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana, USA

Optical nanoantennas have been of great interest recently due to their ability to support a highly efficient, localized surface plasmon resonance and produce significantly enhanced and highly confined electromagnetic fields. Such enhanced local fields have many applications such as biosensors, near-fieldscanning optical microscopy (NSOM), quantum optical information processing, enhanced Raman ...

Optimization of Carbon Nanotube Field Emission Arrays

B. L. Crossley[1], M. Kossler[1], P.J. Collins[1], R. A. Coutu Jr.[1], and L. A. Starman[1]

[1]Air Force Institute of Technology, Wright-Patterson AFB, Ohio, USA

Carbon nanotubes (CNTs) have been proven experimentally to be well suited for field emission applications. An optimized triode configured CNT field emission array is developed using the COMSOL Multiphysics Electrostatics Application to adjust five key physical dimensions to investigate the effects on the enhanced electric field at the CNT emitter tips. The five dimensions studied are CNT spacing, ...

Multiphysics Simulation of a Packed Bed Reactor

A.E. Varela[1], and J.C. García[1]

[1]University of Carabobo, Valencia, Venezuela

Most reactor designs are based on pseudo homogeneous models. This paper studies the COMSOL simulation of a packed bed reactor using a 2-D heterogeneous model. The case considered was a packed reactor with spherical catalyst for oxidation of o-xylene in air to phthalic anhydride. Large differences in intra-pellet temperature were found in comparison with the average temperatures resulting from ...

Nanoscale Heat Transfer using Phonon Boltzmann Transport Equation

S. Sihn[1,2], and A.K. Roy[2]

[1]Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio, USA
[2]University of Dayton Research Institute, Dayton, Ohio, USA

COMSOL Multiphysics was used to solve a phonon Boltzmann transport equation (BTE) for nanoscale heat transport problems. One dimensional steady-state and transient BTE problems were successfully solved based on finite element and discrete ordinate methods for spatial and angular discretizations, respectively, by utilizing the built-in feature of the COMSOL, Coefficient Form of PDE.

Numerical Study of the Electrical Properties of Insulating Thin Films Deposited on a Conductive Substrate

R.A.Gerhardt[1], and S. Kumar[1]
[1]School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA

Parametric finite element simulations were performed to study the effect of film thickness, and electrode size on the different impedance parameters for insulating thin films deposited on a conductive substrate. COMSOL Multiphysics® was used to solve the quasi-static form of Maxwell’s electromagnetic equations in time harmonic mode. Several types of 2D models (linear and axisymmetric) ...

Modeling Hydrogen Permeation through a Thin TiO2 Film Deposited on Pd

Z. Qin[1], Y. Zeng[1], and D.W. Shoesmith[1]

[1]The University of Western Ontario, London, Ontario, Canada

Models that describe hydrogen permeation through a thin TiO2 film deposited on Pd have been developed based on a mass-balance equation consisting of diffusion, reversible hydrogen absorption/desorption, and irreversible hydrogen trapping. These models are solved by the finite element method using COMSOL Multiphysics. By comparing model simulations with experimental permeation curves, values of ...

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