D. Testi, P. Conti
University of Pisa, Department of Energy and Systems Engineering, Pisa, Italy
The use of foundation piles as ground heat exchangers coupled to a geothermal heat pump is considered of interest for possible savings in installation costs, compared to conventional borehole heat exchangers. We refer to them as “geothermal piles” or “energy piles”. The main purpose of the foundation structure is to transmit the load of the building to the lower layers of the soil, best suited ...
B. Chinè , M. Monno
Laboratorio MUSP, Macchine Utensili e Sistemi di Produzione, Piacenza, Italy
Politecnico di Milano, Dipartimento di Meccanica, Milano, Italy
Instituto Tecnologico de Costa Rica, Cartago, Costa Rica
Introduction: In metal foams production, nucleated gas bubbles expand in a heated metal in a mold, then the foam cool and solidify. Thereby energy, mass and momentum transfer mechanisms are present simultaneously in the system and must be taken into account. Metal foam (Figure 1) can be obtained by foaming a precursor, i.e. a mixing of aluminum (Al) powders with the blowing agent TiH2, placing ...
K. Gajjar, U. Maradia, K. Wegener
Indian Institute of Technology Bombay, Mumbai, Maharshtra, India
Institute for Process Tools and Manufacturing (IWF), Zurich, Switzerland
Electrical Discharge Machining (EDM) is a non-conventional process used for machining electrically conducting materials. In die sink-EDM, sparks are generated between tool and workpiece resulting in heating of both electrode surfaces and creating a melt pool of metal which leads to generation of new surfaces on cooling. Physical processes involved in electric discharge and material removal are ...
ENERSPACE Srl, Genoa, Italy
A model built with COMSOL Multiphysics® to exploit meteorological forecasts and instant outdoor meteorological data (temperature, solar radiation, moisture, wind speed and direcition, etc.) together with indoor ambient data (air temperature, radiant temperature of enclosures, etc), building parameters (mass, orientation, surface, structural composition, etc.) and historical consumption of ...
Using COMSOL Multiphysics to Model Crust Development at the Surface of Whole Beef Meat Subjected to Hot Air Jet
J. Sicard , S. Portanguen , C. Chevarin , A. Kondjoyan 
 INRA Auvergne-Rhône-Alpes, Saint-Genès-Champanelle, FRANCE
Crust which develops at the surface of meat leads to reactions which affect food color, flavor and safety. Whole pieces of meat are only contaminated by microorganisms at their surface. Thus intense thermal treatment can inactivate pathogenic bacteria; however the associated high temperatures also lead to the formation of carcinogenic compounds. An experimental study of crust development at ...
COMSOL Multiphysics® as a Tool to Increase Safety in the Handling of Acetylene Cylinders Involved in Fires
F. Ferrero, M. Beckmann-Kluge, and K. Holtappels
BAM Federal Institute for Materials Research and Testing Division II.1 “Gases, Gas Plants”, Berlin, Germany
In this paper a mathematical model for predicting the heating-up of an acetylene cylinder involved in a fire is presented. In the simulations polynomial functions were used to describe the temperature dependency of the thermal properties of the cylinder interior, which is a complex system composed by a solid porous material, a solvent and acetylene dissolved in it. Model equations covered heat ...
B. Lepers, and C. Bobeth
IPHC, CNRS, Strasbourg, France
The feasibility of water cooling is investigated for a solid target which is integrated as the inner conductor in a magnetic horn for secondary particle focusing (pi; K) as used in conventional neutrino beam accelerator experiment. A simple axi-symmetric thermal model calculated in COMSOL is used to obtain the temperature distribution inside the target for different values of h; power beam and ...
O. Rouaud, T. Pham
LUNAM Université, ONIRIS, CNRS, GEPEA, UMR, Nantes, France
University of New South Wales, Sydney, Australia
A mathematical model is developed to determine the weight loss and the freezing rate during the freezing of unwrapped foodstuffs. The model allows comparing two freezing processes; the first uses nitrogen gas at -80°C and the second uses cold air. The model includes thermophysical properties that are temperature dependent to take into account the ice formation. The time step has to be chosen ...
H. Chen-Mayer, R.E. Tosh
National Institute of Standards and Technology, Gaithersburg, MD, USA
The radiation dose produced by an x-ray CT scanner to the patient is conventionally referenced to measurements performed by an ionization chamber in a phantom. On a fundamental level, the radiation absorbed dose, J/kg, can be determined directly by the temperature rise in the absorbing material. We model the temperature response in a high density polyethylene (HDPE) phantom. Use of ...
Application of the Hot Wire Technique and COMSOL Multiphysics for Heat Transfer Monitoring in Solids
J. Hernandez, V. Suarez, J.A. Calderon, E. Marin, B. Rojas, A.G. Juarez, J. Guarachi
Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Legaria del Instituto Politécnico Nacional, Mexico, Distrito Federal, Mexico
We applied the Hot Wire (HW) technique and COMSOL Multiphysics software to study the heat transfer of a homogeneous and isotropic solid material. The HW technique is based on the application of a linear power density modulated by a rectangular pulse of heat, in a specific time period. The power density is applied over the symmetry axis of the sample to produce a radial heat flux and investigate ...