I. Mantilla, S. De Vicente
National University of Engineering, Lima, Perú
Polytechnic University of Madrid, Madrid, Spain
We formulate a new mathematical model of gas-solids mixing hydrodynamic flow  in a combustion chamber with a fluid bed system used in the combustion of mineral coal waste. This model in study is called Model Gas-Solids Mixing and it is constructed by averaging the conservation equations (mass and momentum) for a two-phase flow, which takes into account the existence of a small parameter rho in ...
S. Odiba, M. Olea, S. Hodgson, A. Adgar
Teesside University, School of Science and Engineering, Middlesbrough, United Kingdom
This research deals with the design of suitable microreactors for the catalytic oxidation of volatile organic compound (VOCs), using propane as a model molecule. The microreactor considered consists of eleven parallel channels, in which an Au/Cr/γ-Al2O3-catalyzed combustion reaction takes place. Each channel is 0.5 mm diameter and 100 mm long. The catalytic microreactor was simulated for ...
E. Gutierrez-Miravete, M. Turner
Rensselaer at Hartford, Hartford, CT, USA
General Dynamics-Electric Boat, Groton, CT, USA
Galvanic corrosion is encountered in marine applications because one often has dissimilar metal joints and seawater acts as an electrolyte. One metal acts predominantly as anode and undergoes material dissolution while the other acts predominantly as cathode and is the site where a cathodic reaction takes place. Assuming a stagnant electrolyte, the equation governing the distribution of ...
Computational Modeling of the Electrohydrodynamics Influencing Trace Mercury Adsorption within Electric Utility Electrostatic Precipitators
University of Michigan, Ann Arbor, MI, USA
Introduction: Anthropogenic mercury (Hg) emissions into the atmosphere increase the risk of neurological and neonatal health effects in humans through fish consumption. The U.S. EPA recently (2012) promulgated the first regulations for mercury emissions from coal-fired power plants  and 140 countries recently signed the United Nations Environment Programme's Minamata Convention, a legally ...
T. C. Zhu, B. Liu
University of Pennsylvania, Philadelphia, PA, USA
Singlet oxygen (1O2) is the major cytotoxic agent that kills cells during photodynamic therapy (PDT). An energy diagram for type II PDT interaction is shown in Figure 1. Based on a previously developed model [Ref. 1] that incorporates the diffusion equation for the light transport in tissue and the macroscopic kinetic equations for the generation of the singlet oxygen, the distance-dependent ...
Numerical Simulation: Field Scale Fluid Injection to a Porous Layer in Relevance to CO₂ Geological Storage
S. Kim, S. A. Hosseini, S. D. Hovorka
Bureau of Economic Geology, The University of Texas at Austin, Austin, TX, USA
CO₂ geological storage can help to provide a “bridge” from a fossil-fuel dependent system to a more diversified energy portfolio. Pressure monitoring for an injection zone (IZ) and an above-zone monitoring interval (AZMI) has been under operation at a field-scale CO₂ injection site, Cranfield, MS. Recorded pressure data in the AZMI revealed a certain amount of increase with no evidence of ...
F. Bergeron, P. Pasquier
École Polytechnique de Montréal, Montréal, QC, Canada
Ground freezing techniques using liquid nitrogen are commonly used in order to increase the mechanical properties of the soils. This article presents a new ground heat exchanger using aluminum to increase the effective radius of the heat exchanger. Simulation results indicate that the current design generates a significant thermal short-circuit between the circulation pipes that must be ...
Modeling the Effect of Porosity on the Elastic Properties of Synthetic Graphite Using CT Scans and the Finite Element Method
G. Sowa, R. Paul, R. Smith
GrafTech International Inc., Parma, OH, USA
Predicting physical properties and performance of carbon and graphite materials based on the microstructure of the finished material continues to be a very challenging endeavor, like it has for many decades. However, recent advancements in three-dimensional measurement techniques using X-ray computed tomography (CT) combined with analysis breakthroughs using Simpleware’s ScanIP™ software are ...
Y. Davletshin, J. C. Kumaradas
Ryerson University, Toronto, ON, Canada
Over the last decade, Photoacoustic (PA) imaging has been applied to the biomedical research field and matured into a new clinical modality for tissue imaging and functional cancer cell research. PA imaging uses a pulsed laser to irradiate a region of interest and generate a thermally induced acoustic pressure wave that can be collected by an ultrasound transducer to form an image. The ...
R. Cummings, J. Knox
NASA, Marshall Space Flight Center, Huntsville, AL, USA
COMSOL Multiphysics® has been used to develop assessment tools for the NASA-sponsored Precision Combustion, Inc. (PCI) regenerable Microlith®- based adsorber modules. The Full Scale Water Removal (FSWR) PCI Microlith® was initially modeled for comparison with exit velocity data, measured while exterior canister was removed. Measurement data as well as flow analysis showed that the velocity ...