Modeling the Coupled Heat and Mass Transfer during Fires in Stored Biomass, Coal and Recycling Deposits
F. Ferrero, M. Malow, A. Berger, and U. Krause
Bundesanstalt für Materialforschung und prüfung (BAM), Berlin, Germany
In this paper, advances in the development of a numerical model for predicting the possibility of self-ignition in stored biomass, coal heaps or underground seams and dump deposits are presented. Results from the performed simulations are compared with experimental data. Finally, some conclusions and the possibilities for future work are drawn.
J.-M. Barois, and C. Goulmy
PHOTONIS, Brive, France
Streak tubes are widely used in high-speed signal analysis; they give spatial, temporal and intensity information about one single event. Time resolutions of 0.7 pico-second can be achieved and in that time-domain, PHOTONIS tubes are second-to-none.Applications are numerous and range from plasma physic to femtosecond laser applications. In streak tubes, electrons move from the photocathode to the ...
A Finite Element Analysis of the Influence of Morphology on Barrier Properties of Polymer-Clay Nanocomposites
D. L. Statler Jr., and R. K. Gupta
Department of Chemical Engineering, West Virginia University, Morgantown, WV, USA
Nanocomposites, formed by dispersing a few weight-percent of nanometer-thick platelets of organically-coated montmorillonite clay in a variety of polymers, are being used in food packaging applications. The clay platelets reduce the diffusion coefficient of gases, such as carbon dioxide and water vapor, and prolong the shelf-life of packaged foods and carbonated beverages. Here we use the COMSOL ...
Korea Atomic Energy Research Institute, Korea
This paper presents the application of the nesting method to wind fields on coarse grid to then produce a fine grid wind fields. This is done using COMSOL Multiphysics. Fine-grid wind fields, which are considered to be an urban structure, were useful in drawing scenarios for counter terrorist attacks.Also, it was confirmed that COMSOL Multiphysics could be easily applicable to multi-nesting to ...
A. Avanzini, and G. Donzella
Department of Mechanical and Industrial Engineering, University of Brescia, Brescia, Italy
The mitral valve apparatus is a complex and refined mechanism located between the left atrium and the left ventricle of the heart which can manifest various kinds of pathologies. In order to support identification of potentially critical conditions resulting from some typical cardiosurgery operations, it is important to develop models of the mitral valve that enable prediction of both stress in ...
Time-Resolved Optical Tomography in Preclinical Studies: Propagation of Excitation and Fluorescence Photons.
F. Nouizi, R. Chabrier, M. Torregrossa, and P. Poulet
Laboratoire d’Imagerie et de Neurosciences Cognitives, Straßbourg, France
Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection, France
We present time-resolved methods that rely on near-infrared photons to image the optical properties and distribution of fluorescent probes in small laboratory animals. The coupled diffusion equations of excitation and fluorescence photons in highly scattering tissues were solved using the three-dimensional Finite Element Method (FEM) provided by COMSOL. The computed results allowed to yield ...
H. Pakdast, Z. Davis
DTU Nanotech, Technical University of Denmark, Kgs. Lyngby, Denmark
This article describes the development of a bulk mode resonator which can be employed for detection of bio/chemical species in liquids. The goal is to understand the mechanical and electrical properties of a bulk mode resonator device which exhibit high frequency resonance modes and Q-factor. A high resonance frequency is desirable because a small change in the resonator’s mass, for ...
Simulation of the Destruction Effects in CMOS-Devices caused by Impact of Fast Transient Electromagnetic Pulses
M. Rohe, S. Korte, and M. Koch
Institute for the Basics of Electrical Engineering and Measurement Science, Leibniz Universität Hannover, Germany
In this paper will be presented how an electronic system and its components will respond in case of an impact of an external electromagnetic pulse (EMP). In the first instance the coupling process of transient electromagnetic pulses into electronic systems will be shown. Out of that the disturbing signal inside the system, which is necessary for the following simulation, will be described ...
M. Zell, D. Cronin, D. Morgan, F. Marra, and J. Lyng
School of Agriculture, Food Science and Veterinary Medicine, Agriculture and Food Science Centre, College of Life Sciences, UCD Dublin, Ireland
Dipartimento di Ingegneria Chimica e Alimentare, Università degli Studi di Salerno, Italy
Pasteurization of solid food undergoing ohmic heating has been analyzed using COMSOL Multiphysics on the basis of a previously validated multiphysics model. The simulation of pasteurization by ohmic heating involves simultaneous solution electrical potential within the food, heat transfer, and the kinetics transport of death of microorganisms. In the model, thermo-physical and electrical ...
A Numerical Model for Transient Heat Conduction in Semi-Infinite Solids Irradiated by a Moving Heat Source
N. Bianco, O. Manca, S. Nardini, and S. Tamburrino
Dipartimento di Energetica, Termofluidodinamica applicata e Condizionamenti ambientali, Università degli Studi Federico II, Napoli, Italy
Dipartimento di Ingegneria Aerospaziale e Meccanica, Seconda Università degli Studi di Napoli, Aversa (CE), Italy
A numerical analysis on transient three-dimensional temperature distribution in a semi-infinite solid, irradiated by a moving Gaussian laser beam, is carried out numerically by means of the code COMSOL Multiphysics. The investigated workpiece is simply a solid. A laser source is considered moving with constant velocity along the motion direction. The convective heat transfer on the upper surface ...