Simulating the Influence of the Nozzle Diameter on the Shape of Micro Geometries Generated with Jet Electrochemical Machining
A. Schubert, M. Hackert, and G. Meichsner
Chair Micromanufacturing Technology, Faculty of Mechanical Engineering, Chemnitz University of Technology, Chemnitz, Germany
Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
Jet Electrochemical Machining (Jet-ECM) is an unconventional procedure for micromachining. Based on localized anodic dissolution three-dimensional geometries and microstructured surfaces can be manufactured using Jet-ECM. COMSOL Multiphysics is used at Chemnitz UT to simulate the electric current density in the jet and the dissolution process. A mesh displacement dependent on the normal current ...
A. Cammi, V. Di Marcello, C. Fiorina, and L. Luzzi
Nuclear Engineering Division, Department of Energy, Politecnico di Milano, Milano, Italy
The present work is aimed at evaluating the capabilities of COMSOL Multiphysics® to treat heat transfer in Molten Salt Reactors (MSR). The analyzed situation is represented by the molten salt in turbulent regime flowing through a cylindrical channel surrounded by graphite, with both the fluid and the solid generating power. A suitable validation framework has been set up on the basis of an ...
V. Valente, A. Demosthenous, and R. Bayford
Department of Electronic & Electrical Engineering, University College London, London, United Kingdom
Department of Natural Sciences, Middlesex University, London, United Kingdom
Deep Brain Stimulation (DBS) is a therapeutic tool used for a number of neurological disorders including chronic pain, incontinence and movement disorders, such as Parkinson’s disease. DBS consists of the low-frequency stimulation of an area of the brain, known as basal ganglia. The stimulation is provided by clinical implant, consisting of a pulse generator and an electrode lead ...
F. Lugli and F. Zerbetto
Department of Chemistry “G. Ciamician”, Università di Bologna, Bologna, Italy
A small particle or a nano-sized object placed in a liquid is subject to random collisions with solvent molecules. The resulting erratic movement of the object is known as Brownian motion, which, in nature, cannot be used to any practical advantage both in natural systems (such as biomolecular motors) or by artificial devices. If energy is supplied by external source or by chemical reactions, ...
A. Grünbaum, S. Petersen, H.W. Pau, and U. van Rienen
IEF funded by DFG Research Training Group 1505/1 Welisa, University of Rostock, Rostock, Germany
Otolaryngology “Otto Körner”, University of Rostock, Rostock, Germany
Modeling of 2-5 μm thin membranes into a cochlea with a width of 2 cm is computationally. The paper is focused on two approximative methods used to overcome this problem and in addition a simple model challenging of a plate capacitor with a thin membrane of different thickness in-between is presented. The results of simulations with both thin layer approximation methods are compared with ...
M. Cavenago, P. Antonini, P. Veltri, N. Pilan, V. Antoni, and G. Serianni
INFN-LNL, Legnaro, Padova, Italy
Consorzio RFX, Padova, Italy
Centro Ric. E. Fermi, Roma, Italy
A very simplified system for high voltage test is studied, considering reason for voltage holding failures which are not covered by conventional and local design criteria. A first understanding of the problem is obtained by solving the electrostatic potential in a 2D axis symmetric geometry, considering in detail the electrode shapes, and following a cascade of particle between opposite ...
P. Alotto, M. Guarnieri, and F. Moro
Dipartimento di Ingegneria Elettrica, Università di Padova, Padova, Italy
The proton exchange membrane is a key component in the currently widely studied Proton Exchange Membrane Fuel Cells. In this paper a fully coupled three-dimensional dynamic numerical model of the membrane including all the physically relevant phenomena, i.e. ion transport, hydration-dependent conductivity and thermal effects is presented. The highly non-linear model is discretized by means of ...
Elastoplastic Models of the Interaction between Active Fronts of the Southern Alps and Dinarides (NE Italy and NW Slovenia)
M. Coccia, E. Carminati, F. Rolandone, M. Battaglia, D. Zuliani, and P. Fabris
Università La Sapienza, Roma, Italy
Université Pierre et Marie Curie, Paris, France
Centro Ricerche Sismologiche, Udine, Italy
We use GPS measurements and Finite Element analysis to investigate strain accumulation in the interaction between active fronts of the Southern Alps and Dinarides at the northern edge of the Adriatic micro-plate. We develop a three dimensional model of the area taking into account the regional topography, approximating the crust as an elasto-plastic medium and reproducing as close as possible ...
A. Di Carlo, V. Sansalone, A. Tatone, and V. Varano
Modelling and Simulation Lab, Università Roma Tre, Roma, Italy
Laboratoire de Mécanique Physique, Université Paris Est, Paris, France
DISAT, Università degli Studi dell’Aquila, L'Aquila, Italy
We present a mechanical model a growing spherical shell suitable for predicting the evolution of a Saccular Cerebral Artery Aneurysms (SCAA). It relies basically on the Kröner-Lee decomposition, used to describe the interplay between the current and the relaxed configuration of body elements. Rupture or stabilization of a SCAA are the end effect of a number of biological mechanisms, still poorly ...