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Heat Transfer and Phase Changex

Theoretical and Experimental Validation of Micro Hot Embossing on Polymeric Substrates

F. Lai [1], N. K. Shivaprakash [1], J. Zhang [1], A. Panwar [1], J. Mead [1], C. Barry [1], Q. Truong [2],
[1] University of Massachusetts Lowell, Lowell, MA, USA
[2] US Army Natick Soldier Research, Development and Engineering Center, Natick, MA, USA

Micro hot embossing on a large area polymeric substrates using roll-to-roll (R2R) mode has been considered as one of the most promising technologies that can offer continuous fabrication of large area polymeric substrates. Besides continuous operation, roll-to-roll (R2R) process offers ... Mehr lesen

A COMSOL Multiphysics® Software Analysis of Beam Tube Cooling in the High Flux Isotope Reactor of ORNL

J. D. Freels [1],
[1] Research Reactors Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

Previous to the present work, a formal calculation was approved [1,2] to support the operation of the High Flux Isotope Reactor (HFIR) Horizontal Beam-Tube 1 of 4 (HB-1). The present calculation [3,4] repeats the previous work using COMSOL Multiphysics® software and extends the analysis ... Mehr lesen

Tunnels, a New Potential Source of Energy: 3D Modeling of a Heat Exchanger within Tunnel Lining

C. Soussi [1], O. Fouché [2], G. Bracq [3], S. Minec [3],
[1] Le Cnam, Paris, France
[2] Ecole des Ponts, Champs-sur-Marne, France
[3] Bouygues Construction, Saint-Quentin-en-Yvelines, France

This work investigates the possibility of thermal activation of future tunnels to heat and/or cool the surface buildings or infrastructure such as subways stations. The principle is to insert pipes in the tunnel lining segments, which are connected to a geothermal pump. A heat transfer ... Mehr lesen

Thermal Analysis on Module Level in an Automotive Battery Package

Z. Wu [1], H. Kemper [1],
[1] Energy Storage Systems, FH Aachen, Aachen, Germany

Vehicles with battery as energy storage fascinate more and more people. Meanwhile, more questions are surfaced – How to ensure a safe operation of the battery package? How long could the cycle life of a battery package reach? Can a battery package be operated in any environmental ... Mehr lesen

Simulation of Electro-Thermal Transients in Superconducting Accelerator Magnets

L. Bortot [1], M. Maciejewski [2], M. Prioli [1], B. Auchmann [3],
[1] CERN, Geneva, Switzerland
[2] CERN, Geneva, Switzerland; Lodz University of Technology, Lodz, Poland
[3] CERN, Geneva, Switzerland; Paul Scherrer Institute, Zurich, Switzerland

The paper presents the application of COMSOL Multiphysics® software to the modelling of superconducting accelerator magnets. A 2D magneto-thermal model is developed, using an equivalent magnetization formulation to take into account the eddy-currents’ effects. Due to the model ... Mehr lesen

Numerical Analysis and Experimental Verification of a Fire Resistant Overpack for Nuclear Waste

P. Geraldini [1], A. Lorenzo [1],
[1] Sogin S. p. A., Rome, Italy

Confinement systems for nuclear waste are usually designed to perform and ensure safety in view of all the assumed design basis events, including fires. Considering waste typology and radioactivity, the goal of the confinement system design is to protect the content of the steel drums ... Mehr lesen

Simulation of Thermomechanical Couplings of Viscoelastic Materials

F. Neff [1], T. Miquel [2], M. Johlitz [1],
[1] Universität der Bundeswehr München, Munich, Germany
[2] 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 ... Mehr lesen

Modeling and Simulation of Thermal Runaway in Cylindrical 18650 Lithium-Ion Batteries

A. M. Melcher [1], C. Ziebert [1], B. Lei [1], M. Rohde [2], H. J. Seifert [2]
[1] Karlsruhe Institute of Technology, IAM-AWP, Karlsruhe, Germany
[2] Karlsruhe Institute of Technology, Karlsruhe, Germany

In this work the coupled electrochemical-thermal model for a lithium-ion battery (LIB) based on porous electrode theory has been extended with contributions coming from exothermic side reactions based on an Arrhenius law to model abuse mechanisms, which could lead to a thermal runaway. ... Mehr lesen

Numerical Model for Predicting Heat and Mass Transfer Phenomena during Cake Baking

P. Le Bideau [1], R. Cutté [1], P. Glouannec [1], J. F. Le Page [2]
[1] Univ. Bretagne Sud, FRE CNRS 3744, IRDL, F-56100 Lorient, France
[2] DPP, ADRIA Développement, Quimper, France

A transient two-dimensional axisymmetric model is implemented in COMSOL Multiphysics® software to simulate temperatures, moisture contents distributions and cake swelling during the baking of cake contained in mold. The medium is assumed to be a deformable porous medium containing three ... Mehr lesen

Numerical Analysis of the Phase Change in High Power Latent Heat Storages with 3D Wire Structures

A. Schlott [1], J. Hörstmann [2], O. Andersen [1], J. Meinert [1],
[1] Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Branch Lab Dresden, Dresden, Germany
[2] Denso Automotive Deutschland GmbH, Department Heat Exchanger Application, Eching, Germany

Latent heat storage devices use the melting enthalpy of a so-called phase change material (PCM) to store thermal energy. Open porous metals, such as 3D wire structures, allow the design of systems with tailored storage capacity and power. A geometric unit cell was identified, modelled ... Mehr lesen

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