A Computational Study on Thermal Conductivity Measurements of High Temperature Liquid Materials - new
X. Ye, R. W. Hyers
Department of Mechanical & Industrial Engineering, University of Massachusetts - Amherst, Amherst, MA, USA
Accurate thermo-physical properties of materials are valuable for both scientific research and industrial applications. For high temperature liquid materials, two issues exclude traditional methods: elevated reactivity of test material and experimental apparatus, uncontrolled heat transfer through radiation and convection. Electromagetic Levitation (EML) based Modulated Calorimetry (EML-MC) ...
Sensibility Analysis of Inductance Involving an E-core Magnetic Circuit for Non Homogeneous Material
K. Z. Gomes , T. A. G. Tolosa , E. V. S. Pouzada ,
 Mauá Institute of Technology, São Caetano do Sul, SP, Brazil
In this work, a methodology is developed, based on the application of finite element method in the frequency domain, using the COMSOL Multiphyics software, aiming the sensibility analysis of inductance calculation involving some configurations of an E-core magnetic circuit. Such important analysis, are made from several geometries and considering different frequencies for the source current ...
F. Neff , T. Miquel , M. Johlitz ,
 Universität der Bundeswehr München, Munich, Germany
 École polytechnique, Palaiseau, France
Using COMSOL Multiphysics® software, a new model was implemented with the Physics Builder functionality, which provides a thermomechanical coupling. It consists of two independent physics interfaces, one for the mechanical, viscoelastic behavior and one for the heat transfer. With the multiphysics coupling features it is now possible to add the effects of thermal expansion and dissipation or ...
L. Helmich, A. Huetten
Bielefeld University, Bielefeld, Germany
Thermography measurements on metallic thin films are challenging due to reflections from the environment. We present a thin "gold black" absorption layer to deal with this issue. A multiphysics model is introduced to correct the experimentally obtained data for undesirable heat transfer effects between the metallic sample and the absoption layer.
Micromechanical Design of Novel Thermal Composites for Temperature Dependent Thermal Conductivity - new
R. C. Thiagarajan,
ATOA Scientific Technologies Pvt. Ltd., Bengaluru, Karnataka, India
Materials with an order variable in thermal conductivity as a function of temperature are desirable for thermoelectric heat energy recovery, building thermal insulation and solar thermal applications. Thermal Conductivity is an inherent material property. Engineering the fundamental thermal conductivity needs manipulation at thermal photon level for conventional materials. Engineering thermal ...
Analysis of Superheater Tubes with Mutual Irradiation as Applied to a Solar Receiver Steam Generator
N. Lemcoff, S. Wyatt
Rensselaer Polytechnic Institute, Hartford, CT, USA
Alstom Power, Windsor, CT, USA
The objective of this paper is to analyze the temperature variations within a superheater tube of a solar receiver steam generator. The tube is heated by concentrated, collimated solar irradiation with major cooling by an internal steam flow. The influence of heat loss by radiation, internal convection, and conduction are considered. Analytical models are obtained for an isolated tube, and the ...
Thermal Study of Valve Regulated Lead Acid Batteries and Electronics Chamber Used in Stand-Alone Street Lighting Applications - new
D. Groulx, J. Skaalum, T. Jamieson
Mechanical Engineering, Dalhousie University, Halifax, NS, Canada
This paper presents a study on the heat generation of Valve-Regulated Lead Acid (VRLA) batteries used in off-grid streetlighting applications from PoleCo, a Halifax based company. One goal of the project was to produce validated COMSOL® models of the enclosure that holds these VRLA batteries. This model can then be used to investigate methods of reducing the temperature of the batteries based on ...
A. D'Orazio, C. Agostini, S. Fiacco
Dipartimento di Ingegneria Astronautica, Elettrica ed Energetica - Sapienza University of Rome, Rome, Italy
Fundamental component of the NMR tomograph is the magnet. By using the property of superconductivity it is possible to achieve an induction field extremely homogeneous, stable and high. To maintain the material below the superconducting critical temperature (7.2K), the coils are immersed in liquid helium at 4K, within a cryostat. In this paper, we present the preliminary results related to the ...
J. v. Schijndel , S. Goesten , H. Schellen ,
 Eindhoven University of Technology, Eindhoven, Netherlands
Benchmarks are important tools to verify computational models. In the research area of building physics, the so-called HAMSTAD (Heat, Air and Moisture STAnDardization) project is a very well known benchmark for the testing of simulation tools. In this paper we revisit this benchmark by modeling all five subtasks using the COMSOL Multiphysics® software. Again we conclude that the COMSOL® software ...
J. C. Almachi , J. A. Montenegro ,
 Departamento de Formación Básica, Escuela Politécnica Nacional, Quito, Pichincha, Ecuador
The fixed beds have the advantage of large heat transfer area, for they are used in some designs of innovative nuclear reactors as the reactor FBNR. Inside of study of fixed beds is important to define the following parameters: flow minimum and velocity profile of cooling fluid, temperature profile of cooling fluid and the fuel elements.