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.

Modeling of Two-Phase Flows

K. O. Lund
Engineering Consultant to SML Associates, Del Mar, CA, USA

Viscous equations are developed for regions with two interacting flowing fluids, or two fluid phases, such as occur in fluidized particle beds or the mixing of fluids. The descriptive equations are rendered into the standard COMSOL PDE matrix form, and solved over typical two-dimensional regions, as time-dependent interacting laminar flows.The model geometry selected is that of a so-called ...

Magnetic Particle Motion in a Gradient Field

U. K. Veeramachaneni, and R. Lloyd Carroll
Department of Chemistry, West Virginia University, Morgantown, WV, USA

A model is presented for predicting the motion of magnetizable particles in a gradient magnetic field, considering the effects of fluidic forces on particles in the micro system.The micro system consists of a gradient magnetic field (such as that produced by a solenoid or permanent magnet), a magnetizable particle, and the fluid surrounding the particle (water).Particles located in the gradient ...

3D Modeling of a Surface-Acoustic-Wave (SAW) Based Sensor

Y. Rao1, and G. Zhang1,2
1Micro/Nano Bioengineering Laboratory, Athens, GA, USA
2Nanoscale Science and Engineering Center, Faculty of Engineering, The University of Georgia, Athens, GA, USA

In this study, the effect of adding nanostructures to the sensitive layer and changing the layer’s material property on the characteristics of SAW propagation is investigated under two types of wave perturbation: an impulse wave function and a sinusoidal wave function.To simulate the effect of adsorption of certain molecular species, the models are analyzed under two conditions: with and ...

Modeling, Simulation, and Optimization of the Catalytic Reactor for Methanol Oxidative Dehydrogenation

T. M. Moustafa, M. Abou-Elreesh, and S.-E. K. Fateen
Department of Chemical Engineering, Cairo University, Cairo, Egypt

A steady state model was developed to investigate the performance of the catalytic partial oxidation tubular reactor for methanol oxidative dehydrogenation. The model utilized the kinetics developed from experimental results for the main reaction and three side reactions. The partial differential equations included in the model were the mass transfer equations for the seven components and the ...

Comparison of Darcy's Law, the Brinkman Equation, the Modified Navier-Stokes Equation and the Pure Diffusion Equation in PEM Fuel Cell Modeling

Z. Shi and X. Wang
Oakland University, Rochester, MI, USA

A two dimensional isothermal single phase PEM fuel cell model is developed and implemented in COMSOL Multiphysics, where Darcy's law, the Brinkman equation, the modified Navier-Stokes equation, and the pure diffusion equation are applied separately in porous electrodes. Three values of GDL permeability are investigated. Additionally, the order of the magnitude of each term in the modified N-S ...

Modeling a Ferrofluid in a Rotating Magnetic Field

B. A. Finlayson
Department of Chemical Engineering, University of Washington, Seattle, WA, USA

COMSOL Multiphysics is used to solve the problem of a ferrofluid placed in a rotating magnetic field, known as the spin-up problem. The spin-up phenomenon occurs when the fluid is contained in a cylinder and a homogeneous magnetic field rotates uniformly in the circular cross-section.This work shows how to implement the pertinent equations in COMSOL Multiphysics and shows that the simulations ...

Kinetics of Carbon Dioxide Absorption into Mixed Aqueous Solutions of MDEA and MEA using Laminar Jet Apparatus and Numerically Solved Absorption-Rate/Kinetic Model

M. Edali1, A. Aboudheir2, and R. Idem1
1Process Systems Engineering, University of Regina, Regina, SK, Canada
2HTC Purenergy, Regina, SK, Canada

The experimental kinetic data obtained with a laminar jet apparatus for the absorption of carbon dioxide (CO2) in CO2 loaded mixed solutions of mixed MDEA and MEA were interpreted with the aid of a comprehensive numerically-solved absorption rate/kinetic model. The partial differential equations in this model were solved by two numerical techniques; the finite difference method (FDM) based on an ...

Modeling of Low Pressure Magnetron Plasma Discharge

F. Jimenez, S. D. Ekpe, and S. K. Dew
Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, USA

The plasma characteristics of a low pressure plasma discharge are dependent on the process conditions in a complicated manner. In order to understand this dependence, a comprehensive model, which takes into consideration the effects of the E x B field and gas heating on the transport of plasma particles, is required.In this work, a Monte Carlo - fluid - Poisson hybrid model is used in describing ...

Calculating the Capacitance of Shielded Microstrip Lines

S. M. Musa, and M. N. O. Sadiku
College of Engineering, Prairie View A&M University, Prairie View, TX, USA

This paper presents a numerical analysis for calculating the capacitance of singlestrip and double-strip shielded transmission lines. Modeling and simulation of the capacitance of shielded microstrip lines using COMSOL are illustrated. We determined the capacitance per unit length of each shielded microstrip line.We compared our results with those obtained by other methods and found them to be in ...

COMSOL-Based Numerical Analysis of The Electric Field Distribution During Electrospinning and Piezo-response Imaging of Ultra-Fine Lead Zirconate Titanate Fibers

Y. Wang and J. Santiago-Avilés
Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, USA

In this paper, we present our results on synthesizing micro and nanoscopic lead zirconate titanate (PZT) fibers using electrospinning. Furthermore, the PZT fibers have been characterized using the piezo-response imaging (PRI) technique originally developed for the characterization of piezoelectric thin films.As both electrospinning and PRI work by virtue of electric field, the desired spatial ...

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