National Physical Laboratory, Teddington, Middlesex
This paper describes the use of COMSOL Multiphysics to evaluate the propagation of the liquid-solid interface in fixed point crucibles, and the resulting temperature distribution throughout the system as the phase transition progresses. This enables a robust identification of the features of the melting curve corresponding to physical phenomena such as the liquidus point, and also enhances the ...
Influence of COMSOL on the Design and Testing of the High Flux Isotope Reactor HB-4 Cold Source: Validation of the Simulation
J. D. Freels
Oak Ridge National Laboratory
This presentation concerns our numerical and experimental research on the High Flux Isotope Reactor HFIR, located at the Oak Ridge National Laboratory. In this presentation we give a Brief Pictorial Introduction to the HFIR, som physical properties of Supercritical Hydrogen, and Simulations of both natural and forced convection problems using COMSOL Multiphysics. This presentation also ...
S. Quiniou1, F. Lesage1, V. Ventenat2, and M. A. Latifi1
1Laboratoire des Sciences du Génie Chimique, Nancy, France
2Centre de Recherche Decathlon, Villeneuve d'Ascq, France
In this paper, an investigation of heat and mass transfer in two-layer fabrics, used in the manufacture of comfortable sportswear, is presented. It is based on a model described by partial differential equations representing the mass balance of water vapor, free and adsorbed water and the heat balance in the fabric. The model involves several unknown physical and transfer parameters. A specific ...
W. Vetterling, and Z. Peng
Zink Imaging, Inc., Bedford, Massachusetts, USA
This document describes a method for maintaining the long-term calibration of a full color direct thermal printer. An essential component of the system is a thermal model created using COMSOL Multiphysics that allows fitting of color data recorded at different temperatures and exposure times to model results for the same conditions. The fitted results reveal the depth and thickness of color dye ...
C. Belavý, G. Hulkó, P. Buček, and S. Lel'o
Slovak University of Technology in Bratislava, Bratislava, Slovakia
Technological processes in the engineering practice from point of view of systems and control theory are frequently in the form of distributed parameter systems (DPS). Techniques of FEM based modeling and design of control synthesis methods of DPS which is acceptable for various technological processes, will be demonstrated on modeling and control of temperature fields of the glass melting ...
S. Lefeuvre, and O. Gomonova
Eurl Creawave, Toulouse, France
Siberian State Aerospace University, Krasnoyarsk, Russia
The microwave heating and processing of heterogeneous material is usually simulated using a set of coupled PDE equations in an homogeneous medium. Nowadays it is possible to describe more accurately the process with a suitable description of the heterogeneities that is at the grain level. Many authors work with spheres (circles) to represent the grains but it is difficult to achieve an ...
A. Plana-Fattori[1,2], E. Chantoiseau[1,2], C. Doursat[1,2], and D. Flick[1,2]
AgroParisTech, Massy, France
INRA, Massy, France
Many liquid food processes involve coupled phenomena of fluid flow, heat transfer and product transformation. A typical example is the heat treatment of a starch suspension inside a tubular heat exchanger. Fluid flow influences heat transfer which determines temperature evolution along fluid trajectories. Temperature locally influences the food product transformation. The latter influences ...
N. Williams Portal, M. van Aarle, and J. van Schijndel
Department of Civil and Environmental Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
Department of Architecture, Building and Planning, Technical University of Eindhoven, Eindhoven, The Netherlands
This paper includes the implementation and comparison of two types of moisture potentials for the combined transport: the natural logarithmic of the suction pressure (LPc) and the relative humidity (RH). The finite element method has been utilized to evaluate coupled 1D thermal and hygric transport by means of COMSOL Multiphysics. The combined transport mechanisms were described by the ...
Numerical Study of the Effect of Fins on the Natural Convection Driven Melting of Phase Change Material
C. Liu, and D. Groulx
Natural convection has to be accounted and simulated for in order to properly describe the physics encounter in the phase change process. A simplified two-dimensional model was created in COMSOL 4.1. Natural convection was accounted for by adding a volume force and using the Boussinesq approach. The heat transfer and laminar flow physics were used. Results showed that natural convection played ...
M. Fält, and R. Zevenhoven
Thermal and Flow Engineering Laboratory, Department of Chemical Engineering
Åbo Akademi University
Air-conditioning produced by traditional vapor compression cycle is an energy demanding operation. By using passive cooling methods is it possible to avoid, or at least reduce, the need for vapor compression cooling. A passive radiative cooling method could be a three windowed skylight, filled with a greenhouse gas. Earlier modeling of such a skylight has shown promising results, and work has ...