Swiss Federal Laboratories for Materials Science and Technology
Heat and mass transfer through a gypsum board exposed to fire is simulated and compared to experimental data. The gypsum board is modeled as a porous medium with moist air in the pores. A dehydration front develops at the fire side and travels through the board, consuming energy and releasing water vapor. The vapor migrates through the porous medium by convection and diffusion, and condenses in ...
Y. Jin, E. Holzbecher, and P. Oberdorfer
A novel method for groundwater lowering, which can be applied at construction sites, for aquifer remediation measures or in open mining, is proposed. In contrast to conventional techniques, dewatering is achieved without water conveyance. In this paper the physical concept of the new technology, referred as single borehole pump & inject, is modeled using COMSOL Multiphysics. Two and three ...
Transient Modelling of a Fluorine Electrolysis Cell; Fully Coupled Electric Currents, Heat-Transfer, Diluted Species Transport and Laminar Bubbly Flow
R. Pretorius, P. L. Crouse, and C. J. Hattingh
University of Pretoria, Pretoria, Gauteng, South Africa
Metallurgical Testing and Consultation (MTC) cc, Farrarmere, South Africa
A laboratory-scale fluorine reactor was simulated with COMSOL Multiphysics®. This model employs fundamental fully coupled electron-, heat-, mass- and momentum transfer (two-phase) equations to deliver a transient model of the above-mentioned reactor. Quasi-steady-state results were produced for the current density, electric field, temperature, reactive species concentration, gas- and liquid ...
A. Egedy, T. Varga, and T. Chován
University of Pannonia
Department of Process Engineering
With detailed hydrodynamic modelling of a system the critical parameters and operation limits can be determined. In the field of fluid dynamic and reactor engineering one of the most important aspects is the practical knowledge of future engineers and technicians. In our research several different reactor constructions and impeller configurations were modelled to achieve a better ...
A.Buchau, and W. M. Rucker
Institut für Theorie der Elektrotechnik
The simulation software COMSOL Multiphysics is applied to the numerical com-putation of the magnetic fields of a three-phase transformer. A three-dimensional model of the geometrical configuration is created with the help of the CAD tools of COMSOL Multiphysics. There, all dimensions of the transformer are defined by parameters. The creation of an optimal finite element mesh is improved by some ...
Optimization of a Multiphysic Device – A Comparison of a Finite-Element- and a Equation-based Simulation
M. Jungwirth, and B. Hansbauer
University of Applied Sciences
To avoid overheating and malfunction of an electrical system it is necessary to optimize the power-loss of each component. The power dissipation mostly depends on multiple physical effects and therefore optimization is not an easy task. In this paper we focus on the reduction of complexity employing a equation-based simulation and compare it with a Finite-Element (FE) simulation in the ...
M. Bachmann, V. Avilov, A. Gumenyuk, and M. Rethmeier
BAM Federal Institute for Materials Research and Testing
The article deals with the magnetically-supported high-power full-penetration laser beam welding of aluminum. A stationary simulation was conducted accounting for the effects of natural convection, Marangoni convection and solid-liquid phase transition as well as an electromagnetic volume source term. An ac magnet below the weld specimen induces eddy currents. Consequently, Lorentz forces occur ...
Combined Analytical and Numerical Modeling of a Resonant MEMS Sensor for Viscosity and Mass Density Measurements
S. Cerimovic, R. Beigelbeck, H. Antlinger, J. Schalko, B. Jakoby, and F. Keplinger
Institute of Sensor and Actuator Systems, Vienna University of Technology, Vienna, Austria
Institute for Integrated Sensor Systems, Austrian Academy of Sciences, Wiener Neustadt, Austria
Institute for Microelectronics and Microsensors, Johannes Kepler University Linz, Linz, Austria
A resonant MEMS sensor for viscosity and mass density measurements of liquids was modeled. The device is based on Lorentz-force excitation and features an integrated piezoresistive readout. The core sensing element is a rectangular vibrating plate suspended by four beam springs. The liquid surrounding the plate influences the resonant behavior of the system. Thus, evaluating the properties of ...
N. Kleinknecht, and S. A. Halvorsen
In many metallurgical processes metals are (heated and) stirred by an oscillating external magnetic field. The magnetic field induces electric currents in the metal and the currents interact with the magnetic field to create a force, the Lorentz force. For high frequencies induction only takes place in an electromagnetic boundary layer due to the skin effect and the force is confined within this ...
AGH University of Science and Technology
This elaboration presents a pre-study on automatic rotor construction for the flywheel energy storage system dedicated to operate in the levitation mode. The optimization profile model is used as a basic profile source. The 3D flywheel shape is generated on the base of obtained profiles. Eigenfrequencies are calculated to validate the operation on rigid mode. A steel and aluminum based ...