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 ...
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 ...
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 ...
M. Crosskey and E. Gutierrez-Miravete
Department of Engineering and Science, Rensselaer at Hartford, Hartford, CT, USA
COMSOL Multiphysics has been used to model the temperature distribution produced inside a tool as a result of the forces and friction involved in a cutting process, along with the resulting diffusional flow of cobalt binder from the tool.The model uses as the input tool rake and flank face temperatures determined either experimentally or from other models, and then proceeds to couple the thermal ...
E. Robalinho1, E. F. Cunha1, A. B. Andrade1, M. L. M. Bejarano1, M. Linardi1, and E. Cekinski2
1Instituto de Pesquisas Energéticas e Nucleares (IPEN / CNEN - SP), São Paulo, Brazil
2Instituto de Pesquisas Tecnológicas (IPT - SP), São Paulo, Brazil
Fuel cells are among the most important devices for obtaining electrical energy from hydrogen. Computational Fluid Dynamics (CFD) is a very useful tool for exploring the connection between the transport of reactants and products within the fuel cell and overall cell performance.CFD simulates hydrogen and oxygen gas flow channels to reduce the cost of bipolar plate production through optimizing ...
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 ...
B. Oetiker, B. Friedman, and H. E. Hall Jr.
Department of Physics, Sam Houston State University, Huntsville, TX, USA
Induction type probes are important tools in the oil and gas industry for logging and measurement while drilling (LWD). In horizontal drilling, a common situation requires steering a drill bit close to an interface between two formations without crossing it.Because of azimuthal symmetry, one does not know whether to turn up or down to avoid drilling into the other formation. It has recently been ...
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 ...