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.

Nanofiltration Modeling Based on the Extended Nernst-Planck Equation under Different Physical Modes

J. Gozálvez-Zafrilla, and A. Santafé-Moros
Department of Chemical and Nuclear Engineering, Universidad Politécnica de Valencia, Valencia, Spain

The most successful nanofiltration models are those based on the combination of the Extended Nernst-Planck equation with the Donnan steric equilibrium. These models have been typically solved by using iterative procedures based on the Runge-Kutta method. Yet, such procedures present convergence problems in some cases. In this paper, we present an implementation of the original Donnan Steric ...

Modeling Flow of Magnetorheological Fluid through a Micro-channel

N.M. Bruno[1], C. Ciocanel[1] and A. Kipple[2]
[1]Department of Mechanical Engineering, Northern Arizona University, Flagstaff, Arizona, USA
[2]Dept. of Electrical Engineering and Computer Sciences, Northern Arizona University, Flagstaff, Arizona, USA

This paper presents the approach taken through the utilization of COMSOL Multiphysics 3.5a, to develop a model that simulates the flow of a magnetorheological (MR) fluid through a micro-channel. The model was developed as an aid in the analysis of a micropump that produces flow by means of displacement of a MR fluid slug within a microchannel.

High Coupling Factor Piezoelectric Materials for Bending Actuators: Analytical and Finite Elements Modeling Results

I.A. Ivan[1], M. Rakotondrabe[1], and N. Chaillet[1]
[1]FEMTO-ST Institute, University of Franche-Comte, Besançon, France

New giant piezoelectric factor materials such as PMN-PT and PZN-PT were researched during the last decade and are actually becoming commercially available. As they seem very attractive for actuator designs, we studied their potential in replacing PZT ceramics. In a first comparative approach, we tested a series of classic rectangular composite bimorph structures of different combinations of ...

Design of High Performance Condenser Microphone Using Porous Silicon

S. Suganthi[1], M. Anandraj[2], and L. Sujatha[1]
[1]Department of Electronics & Communication Engineering, Rajalakshmi Engineering College, Chennai, India
[2]Department of Physics, Rajalakshmi Engineering College, Chennai, India

Porous Silicon (PS) can easily be formed by electrochemical etching of silicon in HF based electrolytes at room temperature. Since, PS is compatible with silicon IC technology; it finds lot of applications in the fabrication of MEMS devices. In the current study, we discuss the design of a condenser microphone using a Silicon/ Porous Silicon composite membrane as a movable plate. The performance ...

Mathematical Modeling of Zig-Zag Traveling-Wave Electro-Osmotic Micropumps

J. Hrdlicka[1], P. Cervenka[1], M. Pribyl[1], and D. Snita[1]
[1]Department of Chemical Engineering, Institute of Chemical Technology Prague, Prague, Czech Republic

In this paper we present results of the mathematical modeling of AC electroosmotic micropumps. Unlike others we use the full dynamic description, instead of the linearized model. Skewed hybrid discretization meshes are employed in order to accurately capture the main features of the studied system. Also, we introduce zig-zag electrode arrangements for traveling-wave electroosmotic micropumps. ...

Magnetic Nanoparticles for Novel Granular Spintronic Devices

A. Regtmeier[1], A. Weddemann[2], I. Ennen[3], and A. Hütten[1]
[1]Dept. of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany
[2]Dept. of Elect. Eng. and Comp. Science, Lab. for Electromagnetic and Electronic Syst., MIT, Cambridge, MA
[3]Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria

Superparamagnetic nanoparticles have a wide range of applications in modern electric devices. Recent developments have identi fied them as components for a new type of magnetoresistance sensor. We propose a model for the numeric evaluation of the sensor properties. Based on the solutions of the Landau-Lifshitz-Gilbert equation for a set of homogeneously magnetized spheres arranged in highly ...

RFID-Enabled Temperature Sensor

I.M. Abdel-Motaleb[1], K. Allen [1]
[1]Department of Electrical Engineering, Northern Illinois University, DeKalb, IL, USA

The design of a RFID-enabled temperature sensor is described in this paper. In this sensor, a change in temperature causes structural beams to bend, which results in a proportional displacement of the plates of the capacitor. Plates\' displacement results, in turn, in changing the value of its capacitance. The capacitor of the sensor is coupled to the LC resonant network of a passive RFID tag. ...

Understanding the Role of Nanomaterials in DNA Biosensors Through Finite Element Analysis

J. C. Kumaradas[1], A. Zhang[2], Y. D. Davletshin[1]
[1]Ryerson University, Toronto, ON, Canada
[2]University of Waterloo, Waterloo, ON, Canada

Tremendous progress is being made in the integration of nanoparticles into micro-analytical systems for biosensing. These materials are shown to enhance the analyte capture capability of biosensing platforms. We have implemented a computational model that considers the sensor’s geometry, size, analyte concentration and type to predict the number of nucleic acid molecules captured by ...

Designing the Actuator for the Next-Generation Astronomical Deformable Mirrors: a Multidisciplinary and Multiphysics Approach

C. Del Vecchio[1], R. Biasi[2] , D. Gallieni[3], and A. Riccardi[1]

[1]INAF-OAA, Fierenze, Italy
[2]Microgate Srl, Bolzano, Italy
[3]ADS International Srl, Valmadrera, Italy

The actuation system of the deformable mirror is one of the crucial components of an Adaptive Optics unit. One possible implementation comprehends a linear force motor and a capacitive sensor providing the feedback measure signal. Choosing a magnetic circuit that makes optimum use of the magnetic force delivered by a current and properly arranging the electrostatic geometry allows to obtain very ...

Effect of Mass Adsorption on a Resonant NEMS

J. J. Ruz Martinez
Instituto de Microelectronica de Madrid
Tres Cantos
Madrid, Spain

The motion of a resonant NEMS has been widely studied for many different applications such as structural mechanics in engineering, ultra sensitive mass spectrometers or the well known Atomic Force Microscope. The study of the eigenfrequencies of such structures is very important, and nowadays there are good theoretical methods to accurately predict such eigenfrequencies. When a little mass is ...