B. Morel1, P. Namy2, C. Belhomme1, and I. Crassous3
1Comurhex, Pierrelatte, France
2SIMTEC, Grenoble, France
3LI2C, Paris, France
Modeling electrolysers is a challenge because of the strong coupling between electrical, thermal and CFD equations. Indeed the electrical conductivity of the electrolyte varies with the temperature, which in turn depends on the heat dissipated by the Joule effect and anode over-voltage.In the present study, the fluid velocity values are computed near the electrodes using a diphasic level set ...
J. P. Caire, and F. Jomard
LEPMI, ENSEEG, Saint Martin d'Hères, France
The purpose of this study was the optimization of an industrial furnace from a thermal point of view. Such a cylindrical furnace contains an Al-Mg molten alloy covered by a KCl-NaCl molten salt layer floating on it to prevent alloy evaporation. When tilting the cylindrical furnace, it was necessary to compute the relation between the salt and alloy volumes and the area of the liquid alloy/salt ...
J. P. Caire, and A. Roure
LEPMI-ENSEE, Saint Martin d'Hères, France
The generation 4 of molten salt reactors using the thorium cycle are characterized by a temperature close to 1000 oC. The very large heat transfers involved between the reactor core and the external parts with minimal thermal losses are a major issue. This study investigated a possible inner loop made of a series of conventional graphite filter plate exchangers, pipes and pumps, using the COMSOL ...
J.-M. Barois, and C. Goulmy
PHOTONIS, Brive, France
Streak tubes are widely used in high-speed signal analysis; they give spatial, temporal and intensity information about one single event. Time resolutions of 0.7 pico-second can be achieved and in that time-domain, PHOTONIS tubes are second-to-none.Applications are numerous and range from plasma physic to femtosecond laser applications. In streak tubes, electrons move from the photocathode to the ...
D. Bichsel1, and P. Wittwer2
1HESSO, Ecole d'Ingénieurs de Genève, Geneva, Switzerland
2DPT, Université de Genève, Geneva, Switzerland
We discuss a new numerical scheme involving adaptive boundary conditions which allows to compute, at very low Reynolds numbers, drag and lift of airfoils with rough surfaces; efficiently and with great precision.As an example, we present the numerical implementation for an airfoil consisting of a line segment. The solution of the Navier-Stokes equations is singular at the leading and trailing ...
M. Cacciola, S. Calcagno, D. De Carlo, F. Laganà, G. Megali, F. C. Morabito, D. Pellicanò, and M. Versaci
Department of Informatics, Mathematics, Electronics and Transportations (DIMET) - "Mediterrane" University of Reggio Calabria, Reggio Calabria, Italy
Eddy Current Non Destructive Testing is exploited to evaluate the structural integrity of metallic objects. The aim of this paper is to detect defects located in depth within the inspected object; within this framework, we studied the modelling of exciting coils useful to detect structural flaws. The simulations have been carried out by considering the movement of the coil over a structural steel ...
The Use of COMSOL to Solve Hygrothermal Building Physical Problems Related to Insulating High-rise Building Facades
H. L. Schellen, A. W. M. van Schijndel, and E. Neuhaus
In the Netherlands, high-rise buildings from 1960 and before were hardly insulated. To improve the thermal performance of these buildings, the facades may be retrofitted with insulating material. Energy losses will be reduced and thermal comfort will be improved by higher indoor surface temperatures. Problems, however, may be introduced by thermal bridge effects of anchors, floors and indoor ...
Modelling the Coupled Heat and Mass Transfer during Fires in Stored Biomass, Coal and Recycling Deposits
Federal Institute for Materials Research and Testing Division II.2, Berlin, Germany
It is known that in big storages of bulk materials the danger of the self-ignition is relevant (long time storages). The Consequences of uncontrolled fires include considerable CO2 emission and economical and human losses to mention a few. The understanding of this phenomena is therefore of great importance.A numerical model can be of great help in understanding such complex phenomena. In this ...
R. Winz1, A. de los Rios Gonzalez2, E. von Lieres3, M. Schmittel2, and W. Wiechert1
1Department of Simulation, University of Siegen, Siegen, Germany
2Department of Organic Chemistry, University of Siegen, Siegen, Germany
3Institute of Biotechnology, Research Centre Jülich, Jülich, Germany
T- or Y-shaped microfluidic channels are chemical measurement devices that have become popular in recent years. Using such microdevices gives a better control of the fluid behavior and the chemical reaction kinetics, due to the small quantity of fluid.The concept of the T-Sensor as state-of-the-art is used to determine coupled processes of diffusion and reaction within a small-scaled system on a ...
Design of heat flux microsensor assisted by COMSOL for the study of energy transfer on Si and Cu thin samples
L. Bedra, N. Semmar, A.-L. Thomann, R. Dussart, J. Mathias, and Y. Tessier
GREMI, CNRS-Université d'Orléans, Orléans, France
A commercial heat probe is used for energy transfer measurements on copper and silicon substrates. To do so, the micro sensor has to be calibrated under high vacuum (~10-7 mbar), using a homemade black body as a heat source.Although the HFM is cooled at 5 oC, the solid surface temperature is unknown as the thermal contact resistance. Thus, COMSOL simulations are also used to obtain reliable ...