J. Frassy1, C. Lecot2, M. Murariu3, C. Delattre1, and A. Soucemarianadin1
1Université Joseph Fourier, Grenoble, France
2Université de Savoie, Le Bourget-du-Lac, France
3LETI, CEA, Grenoble, France
We present simulations of drops spreading on random surfaces with either chemical or topographical heterogeneities. All the computations are made within the framework of the lubrication approximation. The droplet height is the solution of a time-dependent nonlinear fourth order partial differential equation, which is solved using COMSOL. Fast Fourier Transform (FFT) together with an appropriate ...
J. Hofman1,2,3, L. Shao2, B. Wols2, W. Uijttewaal2, G. I. J. Pelaar1, E. Beerendonk1, and H. van Dijk2
1Kiwa Water Research, Rijkswijk, The Netherlands
2Delft University of Technology, Delft, The Netherlands
3Waternet, Amsterdam, The Netherlands
UV technology is an emerging technology for drinking-water treatment. It can either be used as a disinfection barrier, where the UV light is used to inactivate pathogenic microorganisms, or in combination with hydrogen peroxide as an advanced oxidation process. The design of UV reactors is very complex. The water flow and related aspects of mixing, the UV light distribution, and the reaction ...
A. Cammi, V. Di Marcello, and L. Luzzi
Politecnico di Milano, Department of Nuclear Engineering, Milan, Italy
This paper presents multiphysics modeling of a circulating nuclear fuel in a simple geometry by means of COMSOL Multiphysics.Among the Circulating Fuel Reactors (CFR), the most promising is the Molten Salt Reactor (MSR). Physics of such circulating nuclear fuel requires five coupled equations of conservation laws: the momentum balance, the energy balance, the neutron balance and the precursors ...
P. Sergeant, and L. Dupré
Department of Electrical Energy, Systems and Automation, Ghent University, Ghent, Belgium
The hysteresis loss in a sample is obtained by evaluating the drag force profile when slowly moving the sample forward and backward through the strong field of a permanent magnet.A numerical time-stepping model is presented that calculates the drag force profile. At every time step, the sample is slightly moved relative to the magnet. The model is based on 2D-FE computations (COMSOL AC/DC module, ...
M. S. Virk, A. E. Holdø, and S. Kaennakham
Energy & Environmental Technology Applied Research Group, Faculty of Engineering and Computing, Coventry University, Coventry, UK
Microfluidic systems hold promise for many novel applications where rapid mixing is important, and has lead to a number of new developments. Despite such major developments, no systematic study has been carried out to understand the effect of flow mechanisms and geometry on microfluidic mixing. This work focuses on a mixing analysis of low Reynolds number (< 25) microfluids in a T-shaped passive ...
R. Wislati, and H. Haase,
Leibniz University of Hanover, Germany
In this paper a 2-phase hybrid linear stepper motor (HLSM), also known as Sawyer linear motor, has been considered as a potential approach in Variable Valve Actuation (VVA) Systems for Internal Combustion Engines. Initially, the reluctance network approach (RNA) with lumped parameters has been used assuming an infinite permeability of the steel core. The results have then been compared with a ...
B. Balannec1, J. M. Gozálvez-Zafrilla2, D. Delaunay1, and M. Rabiller-Baudry1
1UMR - "Sciences Chimiques de Rennes", Université de Rennes, Rennes, France
2Departamento de Ingeniería Química y Nuclear, Universidad Politécnica de Valencia, Valencia, Spain
A CFD calculation of the complex three dimensional flow in a flat membrane module (Rayflow X100, Orelis- Novasep) was made under the conditions of a typical fouling study in order to compare velocity distribution to fouling deposit (with charcoal). The flow was turbulent in the inlet/outlet pipes of the module and laminar in the channel containing the membrane. The local Reynolds number was ...
F. Roy1, B. Dutoit1, F. Sirois2, and F. Grilli3
1École polytechnique fédérale de Lausanne, Lausanne, Switzerland
2Éole polytechnique de Montréal, Montréal, Canada
3F. Grilli, Los Alamos National Laboratory, Los Alamos, NM, USA
Thin films are very promising for the design of novel and an efficient Fault Current Limiter (FCL) made of high-temperature superconductors (HTS). However, before considering the use of these in a power grid, their thermal and highly non-linear electromagnetic behavior in the presence of over-critical currents needs to be investigated in detail.In this paper, we propose a numerical approach to ...
M. Tehler, and S. Jonsson
Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden
The present work describes the first steps in creating a robust material model able to predict volume changes due to thermal expansion and phase transformations.A dilatometer test is simulated starting from room temperature, with an original microstructure constituting a mixture of ferrite and pearlite. During heating, the structure transforms to austenite, which upon quenching will transform ...
A. Soveja1,2, J. M. Jouvard1, and D. Grevey1
1Institut Carnot de Bourgogne, Bourgogne, France
2Faculté de Génie Mécanique, Université "Politehnica" Timisoara, Timisoara, Romania
During laser-matter interaction, a very small layer of molten material forms. The vapor plumes, formed by material vaporization, exercise an overpressure on the molten material. In a previous work, a 1D thermal model was carried out, but this model did not account for all physical phenomena during laser-matter interaction. For that, it is necessary to couple the thermal equations, the fluids ...