Finite-element Validation of Electric Field Distribution inside a Cylindrical Conductor for an Ideal Two-Probe Impedance Measurement
V.S. Kumar, G. Kelekanjeri, and R.A. Gerhardt
Georgia Institute of Technology
A COMSOL Multiphysics model is used to validate recently derived closed-form analytical expressions for the electric field inside a cylindrical conductor for the case of a two-probe impedance measurement. A two-probe impedance measurement consists of applying an AC signal across a specimen placed in between the source and sink electrodes. Analytical solutions for the axial and the radial ...
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 ...
M. Eltoukhy, S. Asfour,, M. Almakky, and C. Huang
 Department of Industrial Engineering, University of Miami
 Department of Production Engineering, Alexandria University
 Department of Biomedical Engineering, University of Miami
In this paper a transient analysis of the thermoelastic contact problem for disk brakes with frictional heat generation is performed using the finite element analysis (FEA) method. The computational results are presented for the distribution of the temperature on the friction surface between the contacting bodies (the disk and the pad). Also, the influence of the material properties on the ...
High-intensity discharge (HID) lamps are highly-efficient light sources with many applications. Depending on the dimensions of the electrode, lamp current, and waveforms, the plasma may attach to the cathode in a diffuse mode, that covers the electrode tip surface, or a localized mode where heating and current transfer occur in a local region of the electrode surface. The localized mode is ...
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 ...
This paper discusses the impact and modeling of stress experienced during the silicon fabrication process for Mosfets. The work addresses some of the issues that come up while trying to model the impact strain has on device performance. Strain dependent mobility models are also discussed.
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 ...
J. Cheng, K.V. Sharp, and M.M. Mench
The Fuel Cell Dynamics and Diagnostics Laboratory and the Microscale Flow Laboratory, Department of Mechanical and Nuclear Engineering, Pennsylvania State University
The dynamics of fuel cell coolant flow with charged nanoparticles were modeled using COMSOL Multiphysics. A computational fluid dynamics physicochemical model of the multi-phase coolant flow has been formulated. For nanoparticles in the fluid, electrokinetic force, hydrodynamic force, and buoyancy forces have been taken into account for the prediction of electrodeposition rate onto channel ...
X. Zhou, and T.C. Zhu
Department of Radiation Oncology, University of Pennsylvania
The purpose of this work is to solve the inverse problem for determining spatially varying optical absorption and reduced scattering coefficients using point sources and light detectors introduced interstitially in a turbid medium. Light fluence rate is calculated using COMSOL Multiphysics for point sources. The Jacobian sensitivity matrix for the Levenberg-Marquardt optimization process is ...
D. Bockenfeld, H. Chen[2,5], D. Rempfer, M.D. Kaminski, and A.J. Rosengart[2,3]
 Department of Mechanical, Material and Aerospace Engineering, Illinois Institute of Technology
 Department of Neurology, The University of Chicago and Pritzker School of Medicine
 Department of Surgery (Neurosurgery), The University of Chicago and Pritzker School of Medicine
 Chemical Engineering Division, Argonne National Laboratory
 Department of Biomedical Engineering, Illinois Institute of Technology
A proposed portable magnetic separator consists of an array of biocompatible capillary tubing and magnetizable wires immersed in an externally applied homogeneous magnetic field. While subject to the homogeneous magnetic field, the wires create high magnetic field gradients, which aid in the collection of blood-borne magnetic nanospheres from blood flow. In this study, a 3-D numerical model ...