V.M. Rodriguez-Zermeno, M.P. Sørensen, N.F. Pedersen, N. Mijatovic, and A.B. Abrahamsen
DTU Mathematics, Lyngby, Denmark
DTU Electrical Engineering, Lyngby, Denmark
Materials Research Division, Risø, DTU, Roskilde, Denmark
This work presents a method to calculate AC losses in thin conductors such as the commercially available second generation superconducting wires through a multiscale meshing technique. The main idea is to use large aspect ratio elements to accurately simulate thin material layers. For a single thin superconductor, several standard test cases are simulated including transport current, externally ...
M. Quast and N.R. Lalic
Gunytronic GmbH, St Valentin, Germany
The sensor type developed by Gunytronic uses corona discharge for measuring flow rates in exhaust streams of automotives, aircrafts and industrial plants. This paper will present the development of testing equipment used in laboratory for investigating physical relations on corona currents, charged particle transport, the calculation of the collateral electric fields and high potentials. This ...
Screening Effects in Probing the Electric Double Layer by Scanning Electrochemical Potential Microscopy
R.F. Hamou, P.U. Biedermann, A. Erbe, and M. Rohwerder
Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
A computational method is developed to study probing the electric double layer by Scanning Electrochemical Potential Microscopy. The model is based on a modified Poisson- Boltzmann equation, which takes into account steric effects. We investigated the effect of metallic apex protrusion and the Open Circuit Potential (OCP) of the tip on the probed potential. A clear electrostatic screening effect ...
Hyperbolic Heat Transfer Equation for Radiofrequency Heating: Comparison between Analytical and COMSOL Solutions
V. Romero-García, M. Trujillo, M.J. Rivera, J.A. López Molina, and E.J. Berjano
Centro de Tecnologías Físicas Acústica, Universidad Politécnica de Valencia, Valencia, Spain
Dpto. Matemática Aplicada, Instituto Universitario de Matemática Pura y Aplicada, Universidad Politécnica de Valencia, Valencia, Spain
Institute for Research and Innovation on Bioengineering, Universidad Politécnica de Valencia, Valencia, Spain
The Radiofrequency Heating (RFH) is widely employed to heat biological tissue in different surgical procedures. Most models analyze the RFH employing a Parabolic Heat Transfer Equation (PHTE) based on Fourier's theory. The PHTE can be used for problems involving long heating times or low thermal gradients. However, when the problem involves short heating times or extreme thermal gradients it is ...
Numerical Modeling of Resistance Welding Process in Joining of Thermoplastic Composite Materials Using COMSOL Multiphysics®
R. Carbone and A. Langella
Material and Production Engineering Department, Università degli Studi di Napoli Federico II, Napoli, Italy
This paper deals of a technology involved in the joining of thermoplastic composites, the resistance welding technology. This process takes advantage in the repeatable melting process for the thermoplastic resins. The process was numerically modeled to study the effect of the two main process parameters, the electric power density applied to the heating elements and the exposure time at the ...
I. Borsi and A. Fasano
Dipartimento di Matematica U. Dini, Università di Firenze, Firenze, Italy
In this paper we present a model to describe the process of waste water filtration based on hollow-fibre membrane filters. In particular, we deal with membranes whose pores diameter is in the range 0.01-0.1 µm. The main problem in these filtering systems is the membrane fouling. The mathematical model consists in two equations for the Darcy's flow through the filter, coupled with an ...
E. Gongadze, S. Petersen, U. Beck, and U. van Rienen
Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
Institute of Electronic Appliances and Circuits, University of Rostock,
The Electrical Double Layer (EDL) plays a major role in understanding the interface between a charged surface (e.g. an implant) and ionic liquids (e.g. body fluids). The three classical models of the EDL (Helmholtz, Gouy, and Chapman-Stern) are numerically solved for a flat surface electrode in the 3D Electrostatics application mode of COMSOL Multiphysics® 3.5a. The values of the electric ...
B. Niu, W. Yan, A.A. Shapiro, and E.H. Stenby
Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
As an effective method to cope with green-house gas emission, and to enhance oil recovery, injection of carbon dioxide into oil reservoirs has obtained increasing attentions. The flooding process involves complex phase behavior among oil, brine and CO2, and geochemical reaction between CO2 and rock. COMSOL Multiphysics® was first applied to simulating two flooding processes with known ...
Danish Technological Institute, Aarhus C, Denmark
The use of the finite element method for understanding and analyzing the freezing and drying processes of food products is in focus in this paper. The objective of this study is to develop a model that can predict temperature distribution and weight loss of food products during the freezing and drying processes. The problem was solved by utilizing heat, mass transfer and moving mesh model. In ...
E. Solomon and V. Mathew
Arcada University of Applied Sciences, Espoo, Finland
Three-dimensional flow analysis was performed by using COMSOL Multiphysics Chemical Engineering Module for the purpose of analyzing the flow properties and finding out the operating points of a test domain. Using material property table for an exemplary melt of LDPE (Low-Density Polyethylene), the logarithmic viscosity-shear rate graph was plotted and fitted to the 4–constant modified Carreau ...