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.

Development of an Optically-Controlled Biochip

S. Maruo
Yokohama National University, Japan

In this presentation, we present our work on optically controlled microfluidic systems. This includes both numerical simulations and experiments.

Overcoming the Diffusion Barrier: Ultra-Fast Micro-Scale Mixing via Ferrofluids

L. Mao, and H. Koser
Department of Electrical Engineering, Yale University, New Haven, CT, USA

We report on the design and simulation of a novel, micro-scale mixing device based on stable water suspensions of magnetic nanoparticles (i.e. ferrofluids). In this paper, a two dimensional COMSOL Multiphysics simulation including time domain electromagnetics, fluid dynamics, diffusion and convection, and user-defined PDEs is used to study the mixing efficiency of the ferrohydrodynamic ...

Multi-Domain Analysis of Silicon Structures for MEMS Based-Sensors

N. Bhalla[1], S. Li[2], and D. Chung[1]
[1]Chung Yuan Christian University, Chungli,Taiwan
[2]National Tsing Hua University, Hsinchu, Taiwan

Investigation in this paper aims at performing Mechanical Stress Strain analysis, Thermal, Piezoresistive and Piezoeletric analysis of Silicon Structures using COMSOL. The simulation results have been cross checked by mathematical calculation.

µHeater on a Buckled Cantilever Plate for Gas Sensor Applications

A. Arpys Arevalo Carreno[1], E. Byas[1], I.G. Foulds[1]
[1]King Abdullah University of Science and Technology, Thuwal, Mecca, Kingdom of Saudi Arabia

In semiconductor gas sensors, the base of the gas detection is the interaction of the gaseous species at the surface of the semiconducting sensitive material. Since the chemical reactions at the surface of the sensor material are functions of temperature. We simulate our µHeater design on a Buckled Cantilever Plate (BCP). Such structure allows the sensor to be suspended for thermal insulation. ...

Evaluation of electric impedance spectra for single bio-cells in microfluidic devices using combined FEMLAB/ELDO modeling

Senez, V., Arscott, S.
CNRS/IEMN

This paper describes a simple method to predict the electrical impedance spectrum of single and cultured cells in micro-devices. It can be used for the rapid design of micro-sensors as well as for more fundamental studies about the interactions of electric fields with bio-cells. The finite element (FEMLAB) and the transport lattice (ELDO) methods are coupled through the MATLAB environment for ...

Design of Traveling Wave Ultrasonic Vibration Disk for Nano-particles in Liquid Dispersion

J. Muraoka, and T. Suzuki
Yamagata Research Institute of Technology
Yamagata
Japan

The traveling wave ultrasonic vibration disks for dispersion of particles were designed by using of FEM analysis. The vibration disks are required specific vibration pattern, which contains three nodal lines. The vibration disk thickness was calculated to be matched the resonance frequency of bolted langevin type transducer and the specific vibration pattern. The alignment of the transducer was ...

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 ...

A study of nonlinear deflection dynamics of a piezoelectric accelerometer

Kaya, T., Koser, H.
Yale University

This work focuses on the study of large amplitude, nonlinear deflection dynamics of a piezoelectric accelerometer and aims to determine the material and geometry limitations on the structural integrity of the device. FEMLAB’s multiphysics capabilities are used throughout this FEA study to understand the relationship of the geometry and materials to the resonance modes, large deflection ...

A microfluidic assay design for real-time bacterial chemotaxis studies

Koser, H., Kaya, T., Mao, L.
Department of Electrical Engineering, Yale University, New Haven, CT

We have developed a novel, multilayered microfluidic chamber that enables the realtime quantitative study of chemotaxis on virtually all types of motile cells. In this paper, we present a FEMLAB modeling study of the 3D chamber design, including a consideration of each device iteration that successively led to the eventual design. The final chamber design is able to create and maintain an ...

Simulation of Evaporating Droplets on AFM-Cantilevers II: Confocal Microscopy and Transversal Bending

T. Haschke[1], E. Bonaccurso[2], H.J. Butt[2], F. Schönfeld[3], and W. Wiechert[1]
[1] Universität Siegen, Lehrstuhl für Simulationstechnik, Siegen
[2] Max-Planck-Institut für Polymerforschung, Mainz
[3] Institut für Mikrotechnik Mainz GmbH, Mainz

The evaporation process of microscopic drops was investigated by depositing them onto atomic force microscope (AFM) cantilevers and measuring the deflection of the cantilever in response to the presence of the drop. We could thus improve a previously presented FE simulation model by comparing the simulations of the cantilever’s transversal deflection to 3-D images of the cantilever’s ...

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