Department of Chemical Engineering, University of Washington
Viscoelastic fluids have first normal stress differences even in rectilinear flow. Thus, they are more complicated than purely viscous non-Newtonian fluids modeled as a power-law model or Carreau model. Viscoelastic effects must be included when modeling the flow of polymer melts and concentrated polymer solutions in situations for which the normal stresses matter. The extrudate swell problem ...
S.A. Lottes, and R.W. Lyczkowski
Argonne National Laboratory
The main focus of this paper is the modeling, simulation, and analysis of the CaBr2 hydrolysis reactor stage in the Calcium-Bromine thermochemical water splitting cycle for nuclear hydrogen production. One concept is to use a spray reactor of CaBr2 into steam. Given the large heat reservoir contained in a pool of liquid CaBr2 that allows bubbles to rise easily, using a bubble column for the ...
V.V. Narvekar, Q. Fan, and S. Warner
Dept. of Materials and Textiles, University of Massachusetts, Dartmouth
A computational model is used to describe the current density distribution and the water management in the Nafion® 117 and Nafion®1115/PP composite membranes. The effects of the change in the membrane water content and the back-diffused water on distribution of proton concentration is discussed.
R. Malek-Madani, and K. McIlhany
Mathematics Dept., United States Naval Academy
The equations that govern motion in oceans and estuaries form a system of nonlinear partial differential equations for velocity, temperature and salinity fields set in complex bathymetries. A hierarchy of intermediate qualitative models have been proposed to help investigators understand the impact of wind stress, Coriolis force, and viscosity. We will present an analysis of these models ...
M. Bikdash, S. Karagol, and M. Charifa
Department of Electrical Engineering, North Carolina A&T State University
Tools are developed that mine the mesh and simulation data provided by the finite-element mesher and solver in COMSOL. The tools developed are used in two applications. In the first, a thermal system is decomposed and an equivalent circuit (EC) is developed for reduced order modeling. In the second application which arises in robotics, the COMSOL mesh is used to plan paths of the robot ...
H.A. Lecuyer, F.H. Bertrand, P.A. Tanguy, J.P. Mmbaga, and R.E. Hayes
 Ecole Polytechnique , Montreal
 University of Alberta, Edmonton
This presentation is concerned with the modelling of deformable non-Newtonian Flow using COMSOL Multiphysics. This general modelling approach has more concrete applications such as paper coating in a metering size press, meniscus location by PIDS to mention a few.
V. Mathur, J. Li, and W.D. Goodhue
Photonics Center, Department of Physics and Applied Physics, University of Massachusetts, Lowell
In this work a micro-cantilever optical-MEMS sensor based on the AlGaAs system is designed and modeled. The device consists of two micro-cantilever beams perfectly aligned with the free ends separated by approximately 200 nm up to 2000 nm. The finite element method (FEM) (COMSOL Multiphysics) has been employed here to model the structural deformation and light propagation through the device. ...
Optimization of an Adiabatic Demagnetization Refrigerator’s Superconducting Magnet Shield for the Micro-X High-Resolution Microcalorimeter X-ray Imaging Rocket
E. Figueroa-Feliciano, M. Cavolowsky, C. Macklin, Z. Li, A. Sharer, and A. Walker
 Massachusetts Institute of Technology, Cambridge, MA
 Olin College, Needham, MA
We are working on the design of a sounding rocket payload to perform high-resolution imaging spectroscopy of the Puppis A supernova remnant. This rocket payload uses Transition-Edge-Sensor Microcalorimeters, which are superconducting detectors that obtain very high (2 eV FWHM at 6 keV) imaging spectra. These devices need to be cooled to 50 mK, for which we are designing an adiabatic ...
Study of the Electric Field Intensity in Bushing Integrated ZnO Surge Arresters by Means of Finite Element Analysis
Shahid Abbaspour (PWUT) University of Technology, Tehran, Iran
In this paper, the electric field in different types of ZnO surge arresters has been investigated by means of finite element modeling using COMSOL Multiphysics. Both conventional and novel built-in-bushing type arresters were studied. Electric field modeling helps designers consider important factors affecting the maximum field intensity in the arrester, avoiding damages to the arrester ...
M.A. Rojas, and V. Grechka
 University of Houston
 Shell International E&P
We present static and dynamic computations of the apparent properties for stacks of horizontal isotropic layers (VTI symmetry). The effective stiffness tensors of such media are given by the Backus theory for statics in the limit of zero thicknesses of the constituent layers. We used COMSOL Multiphysics to verify the theoretical static bounds for these effective stiffnesses.