M. Diaz-Viera, D. Lopez-Falcon, A. Moctezuma-Berthier, and A. Ortiz-Tapia
Instituto Mexicano del Petroleo, México D.F., Mexico
The aim of the present work is to implement in COMSOL Multiphysics a multiphase fluid flow model in porous media, also known in the oil reservoir engineering literature as a black oil model, using a standard finite element approach. In particular, we are interested to apply this model coupled with a multiphase, multicomponent transport model to study Enhanced Oil Recovery processes at laboratory ...
Transport, Growth, Decay and Sorption of Microorganisms and Nutrients through Porous Media: A Simulation with COMSOL
D. Lopez-Falcon, M. Diaz-Viera, and A. Ortiz-Tapia
Instituto Mexicano del Petroleo, México D.F., Mexico
Transport of microorganisms through porous media governs many phenomena in bioremediation of environmental pollution problems and microbial enhanced oil recovery. The aim of this work is to investigate the effects of some transport parameters on breakthrough curves as well as on spatial distribution of components transported through a porous medium by a fluid phase. Using COMSOL Multiphysics and ...
B. Finlayson, A. Aditya, V. Brasher, L. Dahl, H. Dinh, A. Field, J. Flynn, C. Jenssen, D. Kress, F. Ninh, A. Nordmeier, H. Song, and C. Yuen
University of Washington, Seattle, WA, USA
The mixing of liquids was characterized in thirteen different microfluidic devices. The goal was to characterize, in a uniform manner, the flow and mixing that occurred in slow, laminar flow and to present the results that allow quick designs. The mixing of a dilute chemical in another liquid during slow, laminar flow is a particularly difficult task, but the results showed that for ...
J. Muñoz, R. Valencia, and C. Nieto 
 Semillero Termodinámica y Fluidos, Universidad Pontificia Bolivariana, Medellin, Antioquia, Colombia
 Grupo Automática y Diseño
 Instituto de Energía y Termodinámica, Mechanical Engineering Faculty, Universidad Pontificia Bolivariana, Medellin, Antioquia, Colombia
Genetic Algorithms (GA) have proved to be a complete and effective approach for solving optimization problems. This article presents the integration between COMSOL® and a GA optimization tool coded in MATLAB® for the optimization of two thermal systems: a constant area fin in 2D and a concentric heat exchanger in 2D. Analysis permitted us to achieve efficiencies of up to 90%. For the ...
Vanderbilt University, Nashville, TN, USA
Carbon nanotube FETs are generating much interest in the nanoscale electronics area. Typically subthreshold behavior in these devices has been modeled using the Laplace equation. Above threshold behavior uses self-consistent solutions to the Poisson and continuity equations. Accurate modeling of Carbon nanotube FETs needs to include quantum effects such as tunneling. Owing to the coupled nature ...
Professor of Electrical and Computer Engineering, Chemistry and Bioengineering,
Rice University, Houston, TX, USA
Dr. Naomi Halas is currently Professor of Electrical and Computer Engineering, Chemistry, and Bioengineering at Rice University. She is the inventor of nanoshells, nanoparticles with optical resonances spanning the visible and infrared regions of the spectrum. She is co-founder of a company developing nanoshell-based cancer therapy. She is author of more than 150 refereed publications, more than ...
CFD-based Evaluation of Drag Force on a Sphere Unsteadily Moving Perpendicularly toward a Solid Surface: a Simple Model of a Biological Spring, Vorticella Convallaria
S. Ryu, and P. Matsudaira
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
Department of Biology and Bioengineering, Massachusetts Institute of Technology, Cambridge, MA, USA
Vorticella convallaria, a sessile peritrich ciliate having a contractile stalk, is regarded as a model biological spring because of its remarkably fast contraction. Because the cell body shrinks to sphere-like shape during contractions, it can be assumed to be a sphere moving in quiescent water, and Vorticella’s contraction force has been evaluated with Stokes’ law. In this study, we ...
Electro-Thermal Modeling of High Power Light Emitting Diodes Based on Experimental Device Characterization
T. Lopez, and T. Margalith
Philips Research, Aachen, Germany
Philips Lumileds Lighting Company, San Jose, CA, USA
This paper presents a 3D finite element model in COMSOL for the electro-thermal analysis of high power light emitting diodes (LEDs). The proposed model and implementation approach require basic electrical and optical parameters that may be experimentally derived with the aid of advanced post-processing techniques. Extensive experimental validation reveals the capability of the model to accurately ...
Computation of Velocity, Pressure and Temperature Distributions near a Stagnation Point in Planar Laminar Viscous Incompressible Flow
E. Kaufman, and E. Gutierrez-Miravete
Pratt and Whitney, East Hartford, CT, USA
Rensselaer at Hartford, Hartford, CT, USA
As gas turbine temperatures and component life requirements continue to rise, it becomes increasingly important to have a good understanding of the operating temperatures of their components. The objective of this study was to explorate whether a Hiemenz flow approximation based on measured static pressures near an airfoil leading edge can provide a good estimate of the leading edge heat transfer ...
Mathematics Department, University of California, Los Angeles, CA, USA
We present an optimization procedure to optimize the maximum coupling of free space optical wave to surface plasmon. Shape derivative from shape sensitivity analysis is calculated, and the corresponding partial derivatives of the objective functional with respect to finite number of design variables are derived. An optimal design of the gratings to couple maximum amount of free space photon into ...