Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Effect of Deficient Thermal Grease on the Junction Temperature of LEDs Package

K. B. Abdelmlek [1], Z. Araoud [1], K. Abderrazak [2], K. Charrada [1], G. Zissis [3]
[1] Unité d'Etude des Milieux Ionisés et Réactifs, Monastir, Monastir, Tunisia
[2] Unité de Thermique et Thermodynamique des Procédés Industriels, Monastir, Monastir, Tunisia
[3] Laboratoire Plasma et Conversion d'Énergie, Toulouse, France

The use of LEDs package for lighting presents a thermal problem. In fact, 70% of the energy consumption is converted to heat. This affects widely the LEDs performance especially lifetime and luminous efficiency. Thermal management of LED is interested in natural convection cooling. The heat sink geometry and its design is important to ensure good heat transfer. Nevertheless, the control of the ...

CFD Investigation of Cross Bubbly Flow through a Bubble Column with Rectangular Geometry

N. M. Musa [1], D. Kuvshinov [1], P. Rubini [1],
[1] The University of Hull, Hull, East Yorkshire, United Kingdom

Impact of human activities on the climate is evident, and the recent anthropogenic production and discharge of greenhouse gases into the atmosphere is highest in history. The current climate change have had worldwide influence on human and natural systems for example; global warming, melting of ice and snow, and rise in sea level etc. (AGECC 2010, Council 2013, IPCC, 2014). Increase in the ...

Convective Cooling of Electronic Components - new

J. S. Crompton[1], H. Singh[1], K. Koppenhoefer[1]
[1]AltaSim Technologies, LLC, Columbus, OH, USA

In response to continued miniaturization and increased multi-functionality of electronic circuits, the number of integrated circuit (IC) packages on the circuit board continues to increase. As a consequence the operating power density increases and significant increases in the operating temperature of devices result. To maintain operation and long term performance device temperature must be ...

Heat-Accumulation Stoves: Numerical Simulations of Two Twisted Conduit Configurations

D. Rossi[1], P. Scotton[2], M. Barberi[3]
[1]Università degli Studi di Padova, Dipartimento di Geoscienze, Padova, PD, Italy
[2]Padova, Dipartimento di Geoscienze, Padova, PD, Italy
[3]Barberi Stufe LTD, Trento, TN, Italy

An important part of the society considers an increased share of renewable energies as an integral part of a strategy towards a sustainable future. As far as heat supply is concerned, this can be achieved using solar thermal collectors, borehole heat exchangers or trough the combustion of biomass. This article shows two applications of two configurations of twisted conduit inside the external ...

Development of a Thermo-Hydro-Geochemical Model for Low-Temperature Geoexchange Applications

F. Eppner [1], P. Pasquier [1], P. Baudron [1],
[1] École Polytechnique de Montréal, Montréal, QC, Canada

Standing column wells (SCW) are open-loop geoexchange systems used to provide space heating and cooling to buildings. As they use groundwater as heat carrier fluid and modify its thermo-chemical conditions along the year, they may favor calcite dissolution and precipitation, thus increasing maintenance costs. In order to predict the thermo-hydro-chemical (THC) processes occurring in a SCW and ...

A COMSOL Multiphysics® Software Interface with GEMS3K for Modeling Reactive Transport (Geo)Chemical Processes

O. B. Isgor [1], V. J. Azad [1],
[1] Oregon State University, Corvallis, OR, USA

This paper presents a generic interface for reactive transport process modeling that was developed between the COMSOL Multiphysics® software Java API (transport model) and GEMS3K (reaction model). While the transport of different species, kinetics of dissolution/precipitation, system potentials, fluid and gas flow, etc. can be modeled in a complex chemical system with COMSOL® software, the ...

Finite Element Method based Investigation of IPMSM Losses

M. Schmidtner [1], C. Markgraf [1], A. Frey [1],
[1] University of Applied Sciences, Augsburg, Bavaria, Germany

INTRODUCTION: This paper investigates the design of IPMSM as drive motor for an electric race car in the competition called Formula Student. A key parameter for electrical motor is the power density which is very important for the performance of such race vehicles [1] to keep the overall mass small at high power. Furthermore, to run the motor at high power and to prevent it from overheating due ...

Finite Element Analysis of Thermal Fatigue in Thermal Barrier Coatings

U. Bardi[1], C. Borri[1], A. Fossati[1], A. Lavacchi[1], and I. Perissi[1]
[1]Dipartimento di Chimica, Università degli Studi di Firenze, Sesto Fiorentino, FI, Italy

A Finite element model of plasma sprayed TBC’s was developed to estimate the stress induced by thermal cycling experiments. A heat transfer analysis was performed to evaluate the temperature distribution on the specimen during the cooling under an impinging air jet; temperature measurements performed with an infrared pyrometer on the cooled samples show good agreement with the evaluated ...

Numerical Modeling of Resistance Welding Process in Joining of Thermoplastic Composite Materials Using COMSOL Multiphysics®

R. Carbone[1] and A. Langella[1]
[1]Material and Production Engineering Department, Università degli Studi di Napoli Federico II, Napoli, Italy

This paper deals of a technology involved in the joining of thermoplastic composites, the resistance welding technology. This process takes advantage in the repeatable melting process for the thermoplastic resins. The process was numerically modeled to study the effect of the two main process parameters, the electric power density applied to the heating elements and the exposure time at the ...

Modelling Reservoir Stimulation in Enhanced Geothermal Systems

G. Perillo[1], G. De Natale[2], M.G. Di Giuseppe[2], A. Troiano[2], C. Troise[2]
[1]University of Naples Parthenope, Italy
[2]INGV - Osservatorio Vesuviano, Naples, Italy

Fluid injection in deep wells is a basic procedure in geothermal permeability enhancement. The retrieved changes of Pressure and Temperature are subsequently considered as sources of incremental stress and strain changes, using the elastic model from COMSOL Multiphysics®, which are then converted to Coulomb stress changes on favoured faults, taking into account also the background regional ...