In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Seasonal Thermal Performance of Geothermal Piles

D. Testi[1], P. Conti[1]
[1]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 ...

Multiphysics Modeling of a Metal Foam

B. Chinè [1][3], M. Monno[2]
[1]Laboratorio MUSP, Macchine Utensili e Sistemi di Produzione, Piacenza, Italy
[2]Politecnico di Milano, Dipartimento di Meccanica, Milano, Italy
[3]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 ...

Thermal Model for Single Discharge EDM Process Using COMSOL Multiphysics

K. Gajjar[1], U. Maradia[2], K. Wegener[2]
[1]Indian Institute of Technology Bombay, Mumbai, Maharshtra, India
[2]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 ...

Optimization of Architectured Structures in Building for Harness, Storage, and Release of Energy - new

C. Thoumyre[1], P. Lhuissier[1], L. Salvo[1], G. Bienvenu[2], M. Kermarrec[2]
[1]University Grenoble Alpes, SIMaP, Grenoble, France
[2]Hevatech, Ville-la-Grand, France

The problem of storage, and release of thermal energy is an important challenge in various industrial fields. Several systems for thermal energy storage exist like phase change materials (PCM) and thermochemical storage [1]. The first system usually addresses short term storage (day duration) while thermochemical storage are very interesting for longer duration (seasonal storage). However, ...

Using COMSOL Multiphysics to Model Crust Development at the Surface of Whole Beef Meat Subjected to Hot Air Jet

J. Sicard [1], S. Portanguen [1], C. Chevarin [1], A. Kondjoyan [1]
[1] 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 ...

Solid Target Cooling for High Power Neutrino Super Beam

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 ...

Heat and Mass Transfer Modeling During Freezing of Foodstuffs

O. Rouaud[1], T. Pham[2]
[1]LUNAM Université, ONIRIS, CNRS, GEPEA, UMR, Nantes, France
[2]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 ...

Study of Fluid Dynamics and Heat Transfer in MEMS Structures

S. N. Das[1], G. Bose[2]
[1]Centurion University of Technology and Managment, Jatani, Bhubaneswar, Orissa, India
[2]Institute of Technical Education and Research, SOA University, Bhubaneswar, Orissa, India

This paper describes the characteristics of MEMS microchannel and various issues of its designing. Here the major parameters are pressure drop and heat transfer rate. Various structures are modeled and optimized to get a minimum pressure drop and maximum heat transfer rate. The simulation results provide the characterization for Temperature, Mass flow rate, Pressure drop and Reynolds number. ...

Design, Simulation, and Fabrication of Thermal Angular Accelerometers

H. Alrowais [1],
[1] School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA

This abstract introduces a sensor design for detecting angular acceleration in a single plane using thermal convection. The working principal of the device is based on probing temperature profile changes along a micro-torus caused by angular acceleration. By properly choosing the locations of the heaters as well as the temperature sensors, the output signal will correlate to in-plane angular ...

COMSOL Multiphysics® as a Tool to Increase Safety in the Handling of Acetylene Cylinders Involved in Fires

F. Ferrero[1], M. Beckmann-Kluge[1], and K. Holtappels[1]

[1]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 ...