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 ...
Compensating Spatial Variability of Quantity Index in 2D Electrical Impedance Tomography: COMSOL Multiphysics Study
S. Oh, and R. Sadleir
Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
In Electrical Impedance Tomography (EIT), an array of surface electrodes is used to inject current and measure the resulting voltages to non-invasively obtain conductivity distributions of objects. The system can be easily implemented as a device that monitors hemorrhage, respiration, gastric emptying or brain activities.The Quantity Index (QI), an integral measure of reconstructed images, can be ...
A Finite Element Analysis of the Influence of Morphology on Barrier Properties of Polymer-Clay Nanocomposites
D. L. Statler Jr., and R. K. Gupta
Department of Chemical Engineering, West Virginia University, Morgantown, WV, USA
Nanocomposites, formed by dispersing a few weight-percent of nanometer-thick platelets of organically-coated montmorillonite clay in a variety of polymers, are being used in food packaging applications. The clay platelets reduce the diffusion coefficient of gases, such as carbon dioxide and water vapor, and prolong the shelf-life of packaged foods and carbonated beverages. Here we use the COMSOL ...
G. Liu, and A. V. Smirnov
Mechanical and Aerospace Engineering Department, West Virginia University, Morgantown, WV, USA
In this study, a computer simulation was conducted with the purpose of predicting the carbon dioxide transport in two phases in a multi-layer environment of a typical non-mineable coal-bed basin based on the variable saturation model.The results indicate that the transport of carbon dioxide was affected by the properties of the seal layers.With carbon dioxide injection, the porosity, relative ...
J. Dixon1, D. Burkes2, and P. Medvedev2
1Clemson University, Clemson, SC, USA
2Idaho National Laboratory, Idaho Falls, ID, USA
A three-dimensional heat transfer model of the friction bonding (FB) process implementing shallow pin penetration for cladding monolithic nuclear fuel foils is presented.Temperature distribution during the FB process as a function of fabrication parameters such as weld speed, tool load, and tool rotational frequency are predicted. Model assumptions, settings, and equations are described in ...
V. Mathur1, J. Li1, J. Therrien2, and W. D. Goodhue1
1Photonics Center, Department of Physics and Applied Physics, University of Massachusetts, Lowell, MA, USA
2Department of Electrical Engineering, University of Massachusetts, Lowell, MA, USA
Several methods have been demonstrated for depositing nanotubes on microstructures, ranging from using an atomic force microscope (AFM) tip for single tube manipulation to chemically pre-patterning the substrate. However, these techniques have a very low yield and poor reproducibility. Sorting techniques involving filtration and ultrasonication face similar issues. Recently, electric 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 ...
NASA Marshall Space Flight Center
This presentation deals with the investigation of new methods for the adsorption of carbon dioxide and water vapor from manned spacecraft atmospheres. The presentation touches not only the modeling of such methods, but also the important applications. Apart from modeling results on water adsorption and determination of heat transfer coefficients, an historical overview of spacecraft atmosphere ...
W. R. Schlichting1, R. T. Lahey Jr.1, M. Z. Podowski1, and T. A. Ortega G?mez2
1Center for Mutliphase Research, Rensselaer Polytechnic Institute, Troy, NY, USA
2Institute for Nuclear & Energy Technologies, Karlsruhe Institute of Technology, Karlsruhe, Germany
Boiling systems must be analyzed to determine their stability characteristics. Multiphase system instabilities can be predicted by the use of a one-dimensional drift-flux model. Using this model, an analysis has been performed with the COMSOL code to investigate both linear and nonlinear instability phenomena. In particular, density-wave oscillations in boiling channels were investigated, and, ...
K. McIlhany1 and R. Malek-Madani2
1Physics Department, United States Naval Academy, Annapolis, MD, USA
2Mathematics Department, United States Naval Academy, Annapolis, MD, USA
A Normal Mode Analysis of the Chesapeake Bay has reached the phase of performing a time-series analysis. Prior attempts using generalized eigenfunctions obtained from COMSOL have led to extraction of power spectra using a partial domain extraction and a waveletlike correction to the result.A new approach has been developed which effectively solves the spatial equivalent of the Initial Value ...