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Dynamic Crack Propagation in Fiber Reinforced Composites
C. Caruso[1], P. Lonetti[1], and A. Manna[1]
[1]Department of Structural Engineering, University of Calabria, Arcavacata di Rende, CS, Italy
A generalized model to predict dynamic crack propagation in fiber composite structures is proposed. The proposed approach is based on a generalized formulation based on the Fracture Mechanics approach and Moving mesh methodology. Consistently to the Fracture Mechanics, the crack propagation depends from the energy release rate and its mode components, which are calculated by means of the ...
Classical Models of the Interface Between an Electrode and an Electrolyte
E. Gongadze[1], S. Petersen[1], U. Beck[2], and U. van Rienen[1]
[1]Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
[2]Institute of Electronic Appliances and Circuits, University of Rostock,
Rostock, Germany
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 ...
Modeling of Viscous Fingering
E. Holzbecher[1]
[1]Georg-August University, Göttingen, Germany
Viscous fingering is a topic of interest since the beginning of computational fluid dynamics. Here we focus on the classical constellation of miscible displacement, as it has been investigated in Hele-Shaw cells. A temperature or salinity front is entering with a fluid that has a different viscosity. The pure 1D flow is destabilized by the Saffman-Taylor instability. Using COMSOL Multiphysics® ...
Design and Simulation of a Microscale Magnetophoretic Device for the Separation of Nucleated Fetal Red Blood Cells from Maternal Blood
G. Schiavone[1], D.M. Kavanagh[2], and M.P.Y Desmulliez[2]
[1]Politecnico di Torino, Torino, Italy
[2]MIcroSystems Engineering Centre, School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh, Scotland, United Kingdom
Intense research has been carried out into methods that aim at harvesting fetal cells from maternal blood as substitutes to amniocentesis and chorionic villus sampling. This work focuses on the separation of fetal nucleated red blood cells from the maternal circulation based on their intrinsic magnetic properties. The design and simulation of a magnetophoretic separator is described, as it will ...
Model of Heat and Mass Transfer with Moving Boundary During Roasting of Meat in Convection-Oven
A.H. Feyissa[1], J. Adler-Nissen[1], and K.V. Gernaey[2]
[1]Food Production Engineering, National Food Institute, Technical University of Denmark, Kgs. Lyngby, Denmark
[2]Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
A 2D mathematical model of coupled heat and mass transfer describing oven roasting of meat was formulated from first principles. The current formulation of model equations incorporates the effect of shrinkage phenomena and water holding capacity. The model equations are based on conservation of mass and energy. The pressure driven transport of water in meat is expressed using Darcy’s equation. ...
Permanent Magnet Arrangements for Low-Field NMR
C. Horch[1], S. Schlayer[1], and F. Stallmach[1]
[1]Faculty of Physics and Earth Sciences, University of Leipzig, Leipzig, Germany
For low-field NMR (Nuclear magnetic resonance), NdFeB permanent magnet arrangements are proposed to provide the static polarizing magnetic field. Especially a parallel and a circular arrangement of the permanent magnets, iron yokes and small shim magnets were tested and improved by COMSOL. The intent was to guide the design and the construction of NMR magnets by calculating the magnetic field ...
Accuracy of Fully Coupled Loudspeaker Simulation Using COMSOL
M. Hedges[1][2] and Y.W. Lam[1]
[1]Acoustics Research Centre, School of Computing, Science & Engineering, University of Salford, Salford, United Kingdom
[2]Monitor Audio Ltd., Rayleigh, Essex, United Kingdom
Loudspeaker simulation is used to inform the designer as to the performance of a design. In recent years the Finite Element Method (FEM) has been used to model the mechanical and acoustical attributes of a loudspeaker with varying success. This paper shows how a model that incorporates the magnetic, electromagnetic, mechanical and acoustical domains performs. These domains will be coupled where ...
Transport Phenomena and Shrinkage Modeling During Convective Drying of Vegetables
S. Curcio[1] and M. Aversa[1]
[1]Department of Engineering Modeling, University of Calabria, Arcavacata di Rende, CS, Italy
The aim of the present work is the formulation of a theoretical model describing the transport phenomena involved in food drying process. The attention has been focused on the simultaneous transfer of momentum, heat and mass occurring in a convective drier where hot dry air flows, in turbulent conditions, around the food sample. The proposed model does not rely on the specification of ...
Modelling of Heat and Mass Transfer in Food Products
[1]M.B. Andreasen
[1]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 ...
Failure Modes of Underground MV Cables: Electrical and Thermal Modelling
P.A. Wallace[1], M. Alsharif[1], D.M. Hepburn[1], and C. Zhou[1]
[1]Department of Energy Systems Engineering, Glasgow Caledonian University, Glasgow, United Kingdom
Two simulations of the performance of a Paper Insulated Lead Covered (PILC) Medium Voltage (MV) underground cable are presented. The first presents the thermal response of a cable, over seven days, to a realistic load with a diurnal variation. The second concentrates on the variation of the electric field stress within the cable over a single AC cycle. The effects of a void defect within the ...
