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.

Acoustical Design of Stethoscope for Improved Performance

C. Thiagarajan[1], Gururajan R.[2], A. H. Baig[2], Prema S.[3]
[1]ATOA Scientific Technologies Pvt Ltd, Whitefield, Bangalore, Karnataka India
[2]University of Southern Queensland, Toowoomba Qld 4350, Australia.
[3]RMK Engineering College, Chennai, Tamil Nadu, India

Stethoscope is in use for more than 200 years for medical diagnostics, especially for auscultation. Recently, the unprecedented growth in mobile technology revived the use of stethoscope for Telehealthcare. Digital or electronic stethoscopes are increasingly researched for use in Telehealthcare. This paper mainly focuses on the acoustical and multiphysics design aspects of the stethoscope for ...

Simulation Study in Design of Miniaturized MID-Infrared Sensors

B. Mizaikoff, X. Wang, and S.-S. Kim
Institut für Analytische und Bioanalytische Chemie
Universität Ulm
Ulm, Deutschland

Evanescent-wave optical waveguide is widely used as sensing platform for chemical/biological sensor applications. Our research group contributed to on-chip IR sensor technology and made recent progress in miniaturizing such devices utilizing quantum cascade lasers (QCL) in combination with planar GaAs/Al0.2Ga0.8As waveguides. Furthermore progress is reported toward microfabricated Mid-infrared ...

Modeling and Analysis of a Feedback-Controlled Active Magnetic Levitation System using COMSOL Multyphysics Finite Element Software

M. Nabi[1], and K. V. Ajeeth[1]
Department of Electrical Engineering, Indian Institute of Technology Delhi, India

Magnetic levitation systems have been studied in the context of high-speed transportation as maglev trains, high speed machinery as magnetic bearings, and other similar engineering applications. In this paper, a three dimensional arbitrary shaped object is modeled and analyzed through COMSOL. Mechanically the levitated object has three degrees of freedom- two along the x and y axes and the third ...

Motion of Uncharged Particles in Electroosmotic Flow through a Wavy Cylindrical Channel

N. Qudus[1], T. Mahbub[1], S. A. Ali[1], and M. Shajahan[1]
[1] Bangladesh University of Engineering and Technology, Dhaka Bangladesh

A finite element model is employed to describe the electric potential distribution and electroosmotic flow field inside a wavy cylindrical channel. The model uses coupled Laplace and Poisson-Boltzmann to evaluate the electric potential distribution inside the channel. It also contains continuity and Navier–Stokes equations for the solution of fluid flow. A particle trajectory model was ...

An Extension of Lauwerier’s Solution for Heat Flow in Saturated Porous Media

S. Saeid[1] and F.B.J. Barends[2]
[1]Technical University of Delft, Delft, The Netherlands
[2]Deltares and TU-Delft, Delft, The Netherlands

One of the crucial topics in this century is sustainable energy. In this respect, the exploitation of geothermal energy from deep hot aquifers becomes opportune. Hence, insight is required in the heat balance of potential aquifer systems. Essential issues are convection, conduction and dispersion. This article focuses on Lauwerier’s problem. As an extension, it is suggested that beside ...

Microstimulation in The Brain: Does Microdialysis Inuence the Activated Volume of Tissue?

D. Krapohl[1][3], S. Loeffler[2], A. Moser[2], and U.G.Hofmann[1]

[1]Institute for Signalprocessing, University of Luebeck, Lübeck, Germany
[2]Institute for Neurology, University of Luebeck, Lübeck, Germany
[3]Department of Information Technology and Media, Mid Sweden University, Sundsvall, Sweden

Deep Brain Stimulation (DBS) has been established as an effective treatment for Parkinson's disease and other movement disorders. The stimulation is currently administered using tetrode-macroelectrodes that target the Subthalamic Nucleus (STN). This often leads to side effects which bias the surrounding areas, e.g. the speech centre. Targeting a specific brain region can better be achieved with ...

A Study of FEMLAB for Modeling High Frequency Ultrasound Scattering by Spherical Objects

Falou, O.1, Kumaradas, J.C.2, Kolios, M.C.3 1 Dept. of Electrical and Computer Engineering, Ryerson University, ON, Canada
2 Dept. of Electrical and Computer Engineering & Dept. of Physics, Ryerson University, ON, Canada
3 Dept. of Physics, Ryerson University, ON, Canada

Analytical solutions to the problem of wave scattering from three dimensional structures such as spheres have been studied extensively in the past. However, these solutions are not flexible enough to be extended to wave scattering from complex geometries. We have developed a finite element model of acoustic wave propagation through spherical structures to solve the problem of highfrequency (20 ...

Electric Field Distribution in Biological Tissues for Various Electrode Configurations - A FEMLAB Study

Mitchell, W., Sundararajan, R.
Electronics & Computer Engineering Technology, Arizona State University, Mesa, AZ

Electroporation or Electropermeabilization (EP) is a non-viral physical process of inducing and/or increasing permeability of biological membranes by the application of high intensity and short duration electrical pulses. The resulting high field strength in the membrane can lead to the formation of regions of increased permeability, often called pores that allow transmembrane transport of ...

Zweistufiges Modell zur Untersuchung von Marangoni-Konvektion in Schwingenden Flüssigkeitsstrahlen

Modigell, M.
RWTH Aachen, Institut für Verfahrenstechnik, Lehr- und Forschungsgebiet Mechanische Verfahrenstechnik

Der Marangoni-Effekt (Marangoni 1871) oder Grenzflächenkonvektion kann in fluiden mehrphasigen Systemen auftreten, in denen eine Abhängigkeit der Grenzflächenspannung von der Temperatur oder der Konzentration einer gelösten Substanz besteht. Temperaturoder Konzentrationsgradienten in der Grenzfläche führen zur Ausbildung von Spannungsgradienten. Diese beeinflussen die ...

Diffusion-controlled Redox Cycling at Nanoscale Interdigitated Electrodes

Yang, X.1, Zhang, G.1, 2, 3
1 Micro/Nano Bioengineering Laboratory, Department of Biological and Agricultural Engineering
2 Nanoscale Science and Engineering Center
3 Faculty of Engineering, The University of Georgia, Athens, GA 30602, USA

Diffusion controlled redox cycling behavior at nanoscale interdigitated electrodes (IDEs) was simulated using FEMLAB. Cyclic voltammograms were obtained for IDEs with various sizes and spacing, and current collection efficiency and cycling number were calculated. We found that as the size of the IDEs decreased, the shape of the voltammogram changed from a peak-shaped curve to a sigmoidal ...

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