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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
The Simulation of Pore Scale Fluid Flow with Real World Geometries Obtained from X-Ray Computed Tomography
W. Fourie1, R. Said2, P. Young3, and D. L. Barnes1
1Department of Civil and Environmental Engineering, Water
and Environmental Research Center, University of Alaska, Fairbanks, AK, USA
2Simpleware, Ltd. Exeter, UK
3Computer Science and Mathematics, School of Engineering, University of Exeter, Exeter, UK
With the recent improvement of X-ray Computed Tomography and robust modeling tools, it is now possible to show that pore scale fluid flow modeled by the Navier-Stokes equation can be used to derive macro parameters of Darcy’s Law, such as the hydraulic conductivity. The model allows calculation of isotropy, tortuosity and dispersivity of the soil in all directions. These parameters, which are ...