C. Touvrey, V. Bruyere, P. Namy
CEA DAM, Valduc, France
SIMTEC, Grenoble, France
Spot laser welding is largely used in industrial manufacturing, especially in the case of small penetration depth. Unfortunately, welded joins are often polluted by porosities. The formation of porosities depends on complex thermo-hydraulic phenomena. During the interaction, a deep and narrow cavity - called the keyhole - is formed. At the end of the interaction, surface tension forces ...
COMSOL Multiphysics® Based Identification of Thermal Properties of Mesoporous Silicon by Pulsed Photothermal Method
N. Semmar, I. El Abdouni, A. Melhem
GREMI-UMR7344, CNRS/University of Orléans, Orléans, France
The silicon is mainly known under its single-crystal shape and polycrystalline. Since a few decades, a new type of morphology is developed: the porous silicon (p-Si). Meso-porous silicon (Mp-Si) is one of promising materials for future microelectronic chips multi-functionalization systems, and for micro-sensing devices. For thermal properties investigation many experimental systems were ...
A. D'Orazio, C. Agostini, S. Fiacco
Dipartimento di Ingegneria Astronautica, Elettrica ed Energetica - Sapienza University of Rome, Rome, Italy
Fundamental component of the NMR tomograph is the magnet. By using the property of superconductivity it is possible to achieve an induction field extremely homogeneous, stable and high. To maintain the material below the superconducting critical temperature (7.2K), the coils are immersed in liquid helium at 4K, within a cryostat. In this paper, we present the preliminary results related to the ...
Transient Simulation of the Electrolyte Flow in a Closed Device for Precise Electrochemical Machining
M. Hackert-Oschätzchen, M. Penzel, M. Kowalick, G. Meichsner, A. Schubert[1,2]
Professorship Micromanufacturing Technology, Technische Universität Chemnitz, Chemnitz, Germany
Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
Precise electrochemical machining (PEM) is an innovative machining technology which results from further development of the electrochemical sinking. PEM works with pulsed low frequency direct current and oscillation of the tool electrode. As part of the project ‘Electrochemical machining of internal precision and micro-geometries with high aspect ratios by process-state-dependent electrolyte ...
Modeling of Wettability Alteration during Spontaneous Imbibition of Mutually Soluble Solvents in Mixed Wet Fractured Reservoirs
M. Chahardowli, H. Bruining
Delft University of Technology, Delft, The Netherlands
Mutually-soluble solvents can enhance oil recovery both in completely and partially water wet fractured reservoirs. When a strongly or partially water-wet matrix is surrounded by an immiscible wetting phase in the fracture, spontaneous imbibition is the most important production mechanism. Initially, the solvent moves with the imbibing brine into the core. However, upon contact with oil, as the ...
On the Influence of Cancellous Bone Structure upon the Electric Field Distribution of Electrostimulative Implants
U. Zimmermann, R.Bader, U. van Rienen
Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
Department of Orthopaedics, University Medicine Rostock, Rostock, Germany
Since the 1980s, the accelerating effect of electromagnetic fields on bone regeneration is used to treat complicated fractures and bone diseases. At the University of Rostock, an electrostimulative hip revision system is developed, basing on the method of Kraus-Lechner. This method requires an electric fields between 5 and 70 V/m. The bone used for the simulations consisted of two homogenous ...
A. Pezzin, A. Ferri
Politecnico di Torino, Torino, Italy
Air permeability is one of the most important parameters in the study of thermo-physiological comfort of fabrics. The main goal of this work is to develop a virtual process that allows the prediction of air permeability of any fabric without realizing a sample. The Free and Porous Media Flow physics interface was used in COMSOL Multiphysics® software; this allows to use Navier-Stokes equation ...
Modelling of the Dynamical Fluorescent Micro-Thermal Imaging Experiment on the Heat Diffusion in the La5Ca9Cu24O41 Spin Ladder Compound
E. Khadikova, F. de Haan, P. H. M. van Loosdrecht
Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
Department of Physics, University of Cologne, Köln, Germany
The dynamical fluorescent micro-thermal imaging (FMI) experiment has been used to investigate the phonon-magnon interaction in the 1D Heisenberg antiferromagnet La5Ca9Cu24O41. This material shows highly anisotropic heat conductivity due to the efficient magnetic heat transport along the spin ladders in the compound carried by magnetic excitations (magnons). To extract information on the ...
D. Baldissin and D. Lombardo
Compumat S.r.l., Torino, Italy
A two-dimensional mathematical model for the absorption and desorption of H2 in LaNi4.8Al0.2 was developed and experimentally validated. The model is composed of an energy balance, a mass balance and a momentum balance. These differential equations are numerically solved by means of the finite element method using the software COMSOL Multiphysics®. From a comparison between theoretical ...
M. Surita, M. Patel, and S. Marwaha
 Department of Electrical & Instrumentation Engineering, SLIET , Longowal (Deemed University), Punjab
 ABES Engineering College, Department of Electronics and Communication Engineering, Ghaziabad
The purpose of this paper is to illustrate the microwave coagulation therapy (MCT) that can be used mainly for the treatment of hepatocellular carcinoma. In this treatment invasive technique are used in which thin microwave coaxial antenna is inserted into the tumor and the microwave energy heats up the tumor to produce the coagulated region including the cancer cells. We have to heat the cancer ...