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A Study of Optical Sensor Based on Fiber Bragg Grating Using COMSOL Multiphysics®

C. Gavrila[1] and I. Lancranjan[2]

[1]Technical University of Civil Engineering Bucharest, Bucharest, Romania
[2]Advanced Study Centre, National Institute for Aerospace Research “Elie Carafoli”, Bucharest, Romania

Fiber optic sensors can measure a large range of physical, chemical and environmental variables such as temperature, pressure, shape, position, chemical concentration, moisture, etc. Fiber optic sensors provide measurements in applications where the conventional electrical based sensors cannot be used, due to measurement requirements such as extreme temperature, small size, high sensor count, or ...

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® ...

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 ...

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 ...

Helical Coil Flow: A Case Study

M. Cozzini[1]

[1]Renewable Energies and Environmental Technologies Research Unit, Fondazione Bruno Kessler, Povo, TN, Italy

Stationary flow configurations in curved pipes constitute an important subject from both the theoretical and the practical point of view. A typical application concerns the calculation of secondary flow effects on the thermal efficiency of heat exchangers. Motivated by a similar problem, this paper investigates the flow patterns in a helical duct of non trivial cross section. The considered ...

3D Simulation of the Thermal Response Test in a U-tube Borehole Heat Exchanger

L. Schiavi[1]

[1]Dipartimento di Ingegneria Industriale, Università di Parma, Parma, Italy

Simulated Thermal Response Test (TRT) data are analyzed in order to evaluate the effect of the tridimensionality model’s feature in determining the proper value of the soil thermal conductivity and borehole thermal resistance. The 3D system’s simulation during the TRT is realized by adopting the finite element method. The comparison of the numerical results with the analytical ...

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 ...

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 ...

Multibody Contact Analysis of an Rzeppa CV-Joint

L. Armellin[1], F. Gatelli[1], and G. Tanghetti[1]

[1]R&D Department, Metelli S.p.A., Cologne, BS, Italy

Ball joints are widely used in many applications. This paper describes the contact and kinematic analysis of an Rzeppa type constant-velocity joint (CV-joint). Starting from a conveniently simplified 3D model, at fixed joint angle of 45°, a CV-joint made of all “generic steel” components has been studied. Considering only a “perfect” geometry (i.e. not affected by ...

FSI Analysis of Microcantilevers Vibrating in Fluid Environment

A. Ricci[1] and E. Giuri[1]

[1]Materials and Microsystems Laboratory (CHI-Lab), Politecnico di Torino, Torino, Italy

Cantilever vibration in fluid environment is probably one of the most common Fluid Structure Interaction problems in the field of Micro/Nano Electro Mechanical Systems. Usually the effect of fluid on cantilever oscillation is characterized in terms of mode resonance frequencies and quality factors (Qs). In this work a new approach to the above FSI problem is proposed: modes Q factors and ...

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