Technical Papers and Presentations

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.

Modeling of Thermal Microbial Destruction of Dried Powder Related to Properties Evolution and Granulometry

Ferret, E., Fine, F., Gervais, P.
Laboratoire de Génie des Procédés Alimentaires et Biotechnologiques, Dijon, France

Yeast cells of Saccharomyces cerevisiae were homogeneously incorporated to dried wheat flour particles, and then thermally treated in a new HTST (High Temperature Short Time) process for powders decontamination developed by our laboratory. A thermal modeling of spherical particles during treatment was developed with FEMLAB, taking into account thermal properties of each component and their ...

Rigid Inclusion Rotation in Viscous Shear Flow

Taborda, R.1, Ornelas Marques, F.1, Bose, S.2
1 Dep. Geologia and LATTEX, Fac. Ciências, Univ. Lisboa, Lisbon, Portugal
2 GEOMODELS and CGUL, Fac. Ciências, Univ. Lisboa, Lisbon, Portugal

Theoretical and experimental studies on the rotation of rigid inclusions under simple shear flow have typically considered infinite width shear zones and perfect attachment of inclusion to the matrix. According to these models, during progressive simple shear a coherent object would continuously rotate synthetically, which is not the case in many natural ductile shear zones. In this work we ...

Multiphysics for Life Sciences and Health Care: Simulation Examples

Glière, A., Gros d’Aillon, E., da Silva, A.
LETI – CEA Direction de la Recherche Technologique, PA

Numerical simulation, especially by the Finite Element Method, is widespread in research and development laboratories. Three examples of the use of FEMLAB, in fields as diverse as gamma-ray detection by room-temperature semiconductors, fluorescence-enhanced Diffuse Optical Tomography and microfluidic valve for Lab-on-a-Chip, are presented in this paper.

Accelerated Virus Capture to Surfaces Inside Physiological Media by using AC Electrokinetic Effects

Zhang, B., Docoslis, A
Department of Chemical Engineering, Queen’s University, Kingston, ON Canada

This paper presents a numerical investigation of the mechanism by which nonuniform electric fields, created by planar microfabricated electrodes, can cause accelerated transport and capture of virus to a surface inside media of physiological ionic strength. Numerical calculations presented here suggest that the primary mechanism of expeditious virus transport from the bulk of a sample to the ...

Zone sculpting using partitioned electrokinetic injections

Narovlyansky, M.1, Squires, T.M.2, Whitesides, G.M.1
1 Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, U.S.A.
2 Departments of Physics and Applied Mathematics, Caltech, Pasadena, CA

In electrokinetic separations, the narrower and more homogeneous the initial sample plug, the higher the ultimate resolution of the separation. Here we describe a general and versatile method to sculpt low-dispersion, high-fidelity sample zones in microfluidic devices for high resolution electrokinetic separations. In a simple channel intersections microfabricated partitions act to reduce each ...

Calibrating electric instruments of the Huygens probe and modelling the dielectric properties of the atmosphere and of the surface of titan

Simões, F.
Centre d'Etude des Environnements Terrestre et Planétaires (CETP), Saint Maur des Fossès, France

In 14 January, 2005, the Huygens Probe has descent through the atmosphere of Titan and has survived to touchdown, collecting data in the atmosphere and on the surface of the largest moon of Saturn. One of the instruments, the Huygens Atmospheric Structure Instrument (HASI), includes the Permittivity, Waves, and Altimetry (PWA) analyser, which is a subsystem for studying the electric activity of ...

Simulation of electrokinetic instabilities using COMSOL Multiphysics

Carl Meinhart
University of California Santa Barbara
Santa Barbara, USA

This presentation shows a number of models of electrokinetic behaviour, each differentiated by a specific assumption. The purpose is to show how such assumptions can lead to varying results in elektrokinetic simulations. --------------------------------- Keynote speaker's biography: Professor Meinhart completed his Ph.D and Postdoctoral work at the University of Illinois in June of 1995. At ...

A finite–element simulation study of the complex effective permittivity of two-phase random composite materials

Brosseau, C.
Laboratoire d'Electronique et Systèmes de Télécommunications, Université de Bretagne Occidentale, Brest, France

In the current work we introduce a finite-element method (FEM) for calculating the effective permittivity of macroscopically inhomogeneous media. Specifically, we consider two-dimensional (2d) two-phase heterostructures consisting of hard circular disk equilibrated distributions. The hard-disk distribution has been chosen as the reference system since it is one of the simplest idealized models ...

A finite–element simulation study of the complex effective permittivity of two-phase random composite materials

Brosseau, C.
Laboratoire d'Electronique et Systèmes de Télécommunications, Université de Bretagne Occidentale, Brest, France

In the current work we introduce a finite-element method (FEM) for calculating the effective permittivity of macroscopically inhomogeneous media. Specifically, we consider two-dimensional (2d) two-phase heterostructures consisting of hard circular disk equilibrated distributions. The hard-disk distribution has been chosen as the reference system since it is one of the simplest idealized models ...

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