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.

A Study of Lubricating Flows in MEMS Bearings

E. Gutierrez-Miravete[1], and J. Streeter[2]

[1]Department of Engineering and Science, Rensselaer at Hartford, Hartford, Connecticut, USA
[2]Optiwind, Torrington, Connecticut, USA

The bearing and shaft are part of a safe and arm device constructed as an assembly by a multi-layer additive/subtractive plating and planarization processes (EFAB technology). Devices are constructed by a multi-layer additive/subtractive planarization process. This paper evaluates the lubricating flow between the shaft and journal of the MEMS bearing for seven configurations. The pressure ...

Droplet Generation by Means of a Two-Fluid Probe

B.P. Cahill[1], M. Quade[1], G. Gastrock[1], K. Lemke[1], J. Metze[1], and D. Beckmann[1]

[1]Institut für Bioprozess und Analysenmesstechnik e.V., Rosenhof, Heilbad Heiligenstadt, Germany

This paper presents a simulation of the operation of a new type of droplet generation probe. This probe, consisting of two concentrically-arranged tubings, is immersed in a beaker of cell medium so that oil is pumped through the outer tubing at a pumping speed less than fluid is drawn into the inner tubing. In this way, droplets of cell medium are entrained into the outlet tubing forming a ...

Surface Acoustic Wave Generation in Wurtzite and Zincblende Piezoelectric Materials

D.B. Carstensen, T.A. Christensen, and M. Willatzen
University of Southern Denmark

A surface acoustic wave (SAW) device consists of a piezoelectric material (or film) on which interdigitated transducers (IDT) are placed. Here, they are analyzed based on PZT-5H wurtzite ceramics and InSb zincblende crystals. In PZT-5H, it is possible to generate SAW’s by aligning the interdigitated transducers (IDT) with the crystal axes. In the case with InSb zincblende structures ...

Visions Realized: Using COMSOL Multiphysics to Prepare Students for the Modern World

Bruce A. Finlayson
University of Washington
Washington, USA

This talk demonstrates the success in teaching chemical engineering undergraduates to use COMSOL Multiphysics (FEMLAB) to solve realistic problems in a project format. Undergraduates have been creative and solved problems much more difficult than those in their textbooks, thus gaining a deeper understanding of transport processes. Illustrations are also given how they check to see they’ve ...

Simulation of a Micro-Analytical Device for Adsorbing Substances from a Fluid

R. Winz1, A. de los Rios Gonzalez2, E. von Lieres3, M. Schmittel2, and W. Wiechert1
1Department of Simulation, University of Siegen, Siegen, Germany
2Department of Organic Chemistry, University of Siegen, Siegen, Germany
3Institute of Biotechnology, Research Centre Jülich, Jülich, Germany

T- or Y-shaped microfluidic channels are chemical measurement devices that have become popular in recent years. Using such microdevices gives a better control of the fluid behavior and the chemical reaction kinetics, due to the small quantity of fluid.The concept of the T-Sensor as state-of-the-art is used to determine coupled processes of diffusion and reaction within a small-scaled system on a ...

Investigating the Use of a Piezoelectric Actuator for the Appendages of a Microrobot

J. Clark, and J. Clark
Purdue University, West Lafayette, IN, USA

We investigate the use of a piezoelectric actuator for the appendages of a microrobot. Possible uses may include micro assembly, mobile surveillance, etc. What is different about this microrobot is that it uses 2 degrees of freedom, low powered piezoelectric flexures, while attempting to mimic the maneuverability of an ant-like insect. In the paper, we use COMSOL to characterize this type of ...

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 ...

Simulating Frequency Nonlinearities in Quartz Resonators at High Temperature and Pressure

A. Beerwinkle[1], R. Singh[1], and G. Kirikera[2]
[1]Mechanics of Advanced Materials Laboratory, School of Mechanical and Aerospace Engineering, Oklahoma State University, Tulsa, OK
[2]Geophysical Research Company, LLC, (GRC) Tulsa, OK

A three-dimensional finite element model, based on the linear field equations for superimposed small vibrations onto nonlinear thermoelastic stressed media given by Lee and Yong, was developed. This method involves solving the thermal stress and piezoelectric model with geometric and material nonlinearities. The thickness-shear mode frequency response of the model was benchmarked to ...

Multiphysics Modeling of Implantable Micro-Electrode for Diagnostic and Therapeutic Applications in Neural Disorders

H. W. Ferose, R. G. Prasath, M. Alagappan, and G. Anju .
PSG College of Technology
Tamil Nadu, India

Neural disorders like epilepsy, Parkinson’s disease and Alzheimer’s disease have become a major area of concern because of their complexity and the huge number of occurrences. At present, most of the treatments are based on drugs and external nerve stimulation demanding critical care. This study aims at the design and simulation of an implantable micro-electrode which can lead to better ...

Heterodimensional Charge-Carrier Confinement in Sub-Monolayer InAs in GaAs

S. Harrison[1], M. Young[1], M. Hayne[1], P. D. Hodgson[1], R. J. Young[1], A. Strittmatter[2], A. Lenz[2], U. W. Pohl[2], D. Bimberg[2]
[1]Department of Physics, Lancaster University, Lancaster, UK
[2]Institut für Festkörperphysik, Berlin, Germany

Low-dimensional semiconductor nanostructures, in which charge carriers are confined in a number of spatial dimensions, are the focus of much solid-state physics research, offering superior optical and electronic properties over their bulk counterparts. Both two-dimensional (2D) and zero-dimensional (0D) structures have seen wide-ranging applications in laser diodes, solar cells and LEDs to name ...

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