J. Crompton, L. Gritter, S. Yushanov, K. Koppenhoefer
AltaSim Technologies, Columbus, OH, USA
Quenching from high temperature by fluid flow has been analyzed; when no phase transformation occurs heat transfer is a function of conduction and convection. Flow conditions may lead to turbulent flow that affects the heat dissipation over the surface. Analysis of heat transfer with phase transformation is more complex ue to the range of near-wall effects from film boiling, transition boiling, ...
Finite Element Convergence and Speed-Up Studies Using COMSOL Multiphysics and LiveLink™ for MATLAB® with Large Assembly Models
H. Pourzand, A.H. Aziz, A. Singh
Pennsylvania State University, State College, PA, USA
COMSOL Multiphysics along with its LiveLink™ for MATLAB® is used to investigate the needed number of elements and the required order of Lagrangean p element for a number of different simulation models. For this task, convergence study, speed up testing and interactive meshing is performed on a large assembly model which is also imported using the LiveLink™ for SolidWorks®. As a test bench, the ...
Finite Element Solution of Nonlinear Transient Rock Damage with Application in Geomechanics of Oil and Gas Reservoirs
S. Enayatpour, T. Patzek
The University of Texas at Austin, Austin, TX, USA
The increasing energy demand calls for advances in technology which translate into more accurate and complex simulations of physical problems. Understanding the rock damage is essential to understanding the geomechanics of hydrocarbon reservoirs. The fragile microstructure of some rocks makes it difficult to predict the propagation of fracture in these rocks, therefore a mathematical model is ...
M. Christian, S. Firebaugh, A. Smith
United States Naval Academy, Annapolis, MD, USA
This project utilizes the heat transfer module of the COMSOL Multiphysics environment to model the effects that an ohmic heating probe will have on neural tissue. The model quantifies the thermal impact of active components embedded on a neural micro probe by solving the Penne’s bioheat equation with an external MATLAB function to determine the heat generation along the length of the probe. The ...
J.E. Rayas-Sánchez, J. Aguilar-Torrentera, Z. Brito-Brito, J.C. Cervantes-González, C.A. López
Universidad Jesuita de Guadalajara, Tlaquepaque, Jalisco, Mexico
Intel Guadalajara Design Center, Tlaquepaque, Jalisco, Mexico
We perform EM simulations of a low-pass microstrip filter consisting of a cross-junction open stub and two unit sections implemented as defected ground structures (DGS). The defect introduced by unit sections corresponds to an etched lattice on the copper backside ground plane. The filter presents wide and deep attenuation characteristics in the stopband. Different model implementations were ...
Pulsed Eddy Current Probe Development to Detect Inner Layer Cracks Near Ferrous Fasteners Using COMSOL Modeling Software
V. Babbar, P. Whalen, T. Krause
Department of Physics, Royal Military College of Canada, Kingston, ON, Canada
Surface breaking cracks in conductive structures can be detected by conventional eddy current techniques. However, it is very difficult to detect inner layer defects in multilayered conductive structures either by conventional eddy current or ultrasonic methods. The transient/pulsed eddy current (PEC) technology can potentially overcome these limitations and is being developed for detection of ...
The Dow Chemical Company, Midland, MI, USA
Photovoltaic systems can degrade with moisture. The addition of an edge-seal containing a desiccant can reduce the amount of water reaching the interior. This report discusses the modeling of the water transport into the system to determine the amount of edge seal and desiccant required. The moving freezing front of the Stefan heat-transport problem is used to model a moving moisture ...
Voxtel, Inc, Beaverton, OR, USA
University of Oregon, Eugene, OR, USA
In this paper the heat transfer module in COMSOL is utilized to simulate internal heating of an Avalanche Photodiode due to light-induced current through a resistivity that depends on charge carrier concentrations in the device. Initial tests are done by modeling the heating process on a previously-solved silicon p-n junction as a proof of concept before advancing to a more complicated geometry. ...
Design and Nuclear-Safety Related Simulations of Bare-Pellet Test Irradiations for the Production of Pu-238 in the High Flux Isotope Reactor Using COMSOL
J.D. Freels, P.K. Jain, R.W. Hobbs
Oak Ridge National Laboratory, Oak Ridge, TN, USA
The Oak Ridge National Laboratory (ORNL) is developing technology to re-establish the capability to produce plutonium-238 for the National Aeronautics and Space Administration (NASA) as a power source material for powering vehicles while in deep-space. The High Flux Isotope Reactor (HFIR) of ORNL has been utilized to perform test irradiations of in-capsulated neptunium oxide (NpO2) and aluminum ...
Analysis of Superheater Tubes with Mutual Irradiation as Applied to a Solar Receiver Steam Generator
N. Lemcoff, S. Wyatt
Rensselaer Polytechnic Institute, Hartford, CT, USA
Alstom Power, Windsor, CT, USA
The objective of this paper is to analyze the temperature variations within a superheater tube of a solar receiver steam generator. The tube is heated by concentrated, collimated solar irradiation with major cooling by an internal steam flow. The influence of heat loss by radiation, internal convection, and conduction are considered. Analytical models are obtained for an isolated tube, and the ...