Multiphysics Simulation of Thermoelectric Systems - Modeling of Peltier-Cooling and Thermoelectric Generation
Fraunhofer-Institute for Physical Measurement-Techniques (IPM), Freiburg, Germany
Electro-thermal interaction is commonly considered only as a matter of joule heating. In addition, the Seebeck-, Peltier- and Thompson-Effects are significant in materials with high thermoelectric figure of merit Z. These thermoelectric materials have a high Seebeck-coefficient α, a good electric conductivity σ, and a poor thermal conductivity λ. They have widespread areas of ...
Simulation of Optical Properties of the Si/SiO2/Al Interface at the Rear of Industrially Fabricated Si Solar Cells
Y. Yang, and P. Altermatt[1,2]
Institute for Solar Energy Research Hamelin (ISFH), Emmerthal, Germany
Dep. Solar Energy Research, Inst. Solid-State Physics, Leibniz University of Hanover, Germany
The specular and diffuse reflection properties of sunlight at the rear surface of silicon solar cells with various degrees of roughness are computed by solving the Maxwell and material equations in two dimensions, using the COMSOL RF Module. The model is tested on planar Si/SiO2/air interfaces and planar Si/SiO2/Al interfaces. The simulations show that for wavelengths of 800 nm, (i) maximum ...
C. Gavrila, A. Ghiaus, and I. Gruia
Technical University of Civil Engineering Bucharest, Faculty of Building Services, Bucharest, Romania
University of Bucharest, Faculty of Physics, Bucharest, Romania
A dynamic mathematical model, based on physical and transport properties and mass and energy balances, was developed for the simulation of unsteady convective drying of agricultural products (fruits and vegetables) in static bed conditions. The model utilizes water sorption isotherm equations and the change in solid density due to the shrinkage phenomenon. The aim of this article is to describe ...
Advanced Modeling of Friction Stir Welding – Improved Material Model for Aluminum Alloys and Modeling of Different Materials with Different Properties by Using the Level Set Method
Wilhelm Gronbach GmbH, Wasserburg a. Inn, Germany
Friction Stir Welding (FSW) has gained much importance throughout the last years. Beside comprehensive experimental work that has been carried out, the simulation of the welding zone is of major interest. Due to the high strains observed within the welding zone, the Eulerian (CFD) approach seems to be the most promising for the prediction of flow around the FSW tool. However, the CFD ...
H. Schmidt[1,2], and J. Hattel
Technical University of Denmark, Kgs. Lyngby, Denmark
HBS Engineering, Frederiksberg, Denmark
Two friction stir welding models are presented – a global thermal model using the temperature dependent heat source and a local material flow and heat generation model allowing for detailed investigation of different contact conditions. The two models are coupled into a larger local-global model. The flow model includes frictional dissipation from the contact between the work piece and the ...
Dinex Emission Technology A/S, Middelfart, Denmark
Exhaust noise must meet legislation targets, customer expectations and cost reduction which call for design optimization of the exhaust systems in the design phase. One solution is to use 3 dimensional linear pressure acoustics and calculate the transfer matrix of the muffler. The transfer matrix is the basis for calculating either the insertion loss or transmission loss of a muffler. The 3D ...
Simulation of Production Processes using the Multiphysics Approach: The Electrochemical Machining Process
R. van Tijum
Advanced Technology Center, Philips Consumer Lifestyle, Drachten, The Netherlands
Redmer van Tijum studied Applied Physics at the University of Groningen. In 2006, he received his PhD title on ‘Interface and surface roughness of polymer metal laminates’ in the field of Material Science at the University of Groningen. After that he became research and development engineer at Philips, where he focussed his attention on the improvement of production processes mainly ...
M. Zampolli, N. Malm, and A. Tesei
NURC NATO Research Centre, La Spezia, Italy
COMSOL AB, Stockholm, Sweden
Perfectly matched layers (PML) are an efficient alternative for emulating the Sommerfeld radiation condition in the numerical solution of wave radiation and scattering problems. The key ingredient of the PML formulation is the complex scaling function, which controls the anisotropic damping of the PML. The objective of this study is to propose a modified complex scaling function capable of ...
K. Ehrhold, S. Christiansen[1,2], and U. Gösele
Max Planck Institute of Microstructure Physics, Halle, Germany,
Institute of Photonic Technology, Jena, Germany
Plasmonics is a new branch of the fascinating field of photonics and develops concepts to quench light beyond the diffraction limit and enhance electromagnetic fields. These enhancements occur in metals as localized surface plasmon polaritons (LSP) a coupling of the surface density oscillations of the electron gas to the incident light. With threedimensional nano-structures of coinage metals that ...
T. Bjornara, and E. Aker
NGI, Oslo, Norway
Various types of equation system formulations for modeling two-phase flow in porous media using the finite element method have been investigated. These allow for equation manipulation such that the main differences between the formulations are the dependent variables that are solved for. Here we have tested five different formulations for 2D simulations and one for 1D; the Buckley-Leverett ...