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.

Empirical Model Dedicated to the Sensitivity Study of Acoustic Hydrogen Gas Sensors Using COMSOL Multiphysics®

A. Ndieguene[1], I. Kerroum[1], F. Domingue[1], A. Reinhardt[2]
[1]Laboratoire des Microsystèmes et de Télécommunications/Université du Québec à Trois-Rivières, Trois-Rivières, QC, Canada
[2]Laboratoire d’Électronique et des Technologies de l’Information, CEA, LETI Grenoble, France

Due to the increasing demand for hydrogen gas sensors for applications such as automation, transportation, or environmental monitoring, the need for sensitive and reliable sensors with a short response time is increasing. This paper presents an empirical model that studies the sensitivity of acoustic hydrogen gas sensors. A parametric study based on the variation of physical properties of ...

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 ...

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.

Dynamic Observation of Magnetic Particles in Continuous Flow Devices by Tunneling Magnetoresistance Sensors

A. Weddemann[1], A. Auge[1], F. Wittbracht[1], C. Albon[1], and A. Hütten[1]

[1]Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany

Dynamic measurement of magnetic particles in continuous flow devices is made very difficult by the limitations imposed by the sensors themselves. Thus, certain sensor layouts are restricted to either number sensitive or spatial resolutive measurements of magnetic particles. We investigate different new strategies to increase the detection threshold and introduce designs accomplishing both: ...

Evaluation of Tensile Modulus of Carbon Nanotube Bundle Based Composite with Interface Using Finite Element Method

M. S. Islam, F. O. Riktan, S. C. Chowdhury, M. M. R. Chowdhury, and S. Ahmed
Bangladesh University of Engineering & Technology (BUET)
Dhaka, Bangladesh

Carbon Nanotubes (CNTs) have remarkable mechanical, thermal and electrical properties. The properties of CNTs depend on atomic arrangement (how the sheets of graphite are rolled), the diameter and length of the tubes and morphology of nanostructure. In this paper effective elastic properties of CNT based polymer composites are evaluated using a square Representative Volume Element (RVE) in ...

Design and Implementation of MEMS based Blood Viscometer for INR Measurement

J. G. Immanuel[1], K. Poojitha[1], B. Viknesshwar[1], A. Gupta[1]
[1]PSG College of Technology, Peelamedu, Coimbatore, Tamil Nadu, India

The paper brings out the designing and implementation of blood viscosity monitoring device that gives us the INR to measure the effectiveness of anti coagulant medications .When a blood vessel is damaged, clotting cascade begins that results in blood clot. This process is affected by several medical conditions where it becomes mandatory for a patient to intake anti-coagulants. Thus to monitor ...

Optimization of Microstructures Used in CMOS-MEMS Devices Based on a Topological Design Process

J. Mares-Carreño [1], G. S. Abarca-Jiménez [2], M. A. Reyes-Barranca [2],
[1] Escuela Superior de Ingeniería Mecánica y Eléctrica, Instituto Politécnico Nacional, Ciudad de Mexico, D.F., Mexico
[2] Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, D.F., Mexico

The paper exhibits the process followed to obtain the geometry of a support for a MEMS inertial sensor by means of a topology optimization process. The SIMP method is used for the optimization process in which the objective is to obtain a support structure with a minimum rigidity expressed by a maximum allowed displacement in a stablished work direction. In the application of the SIMP method a ...

Design and Analysis of Stacked Micromirrors

S. Park, S. Chung, and J. Yeow

University of Waterloo, Systems Design Engineering, Waterloo, Ontario, Canada

A micromirror or a torsional actuator in general has been proven to be one of the most popular actuators fabricated by Micro-Electro-Mechanical System (MEMS) technology in many industrial and biomedical applications such as RF switches, a laser scanning display, an optical switch matrix, and biomedical image systems. In this paper, two stacked micromirrors are presented and analyzed to show ...

Design of an Electrodynamically Actuated Microvalve Using COMSOL Multiphysics® and MATLAB®

M. Williams, J. Zito, J. Agashe, A. Sopeju, and D. Arnold
University of Florida, Gainesville, USA

This paper describes the design of a normally closed, electrodynamic microvalve.  Magnetic forces between a permanent magnet in the valve cover and a soft magnet in the valve seat hold the valve closed.  The combination of electrodynamic actuation and a mechanical restoring spring are used to open the valve.  A device model and a design optimization strategy using COMSOL ...

The 3D Mixed-Dimensional Quench Model of a High Aspect Ratio High Temperature Superconducting Coated Conductor Tape

W.K. Chan[1,2], J. Schwartz[2], P. Masson[3], and C. Luongo[4]
[1]FAMU-FSU College of Engineering, Tallahassee, FL, USA
[2]North Carolina State University, Raleigh, NC, USA
[3]Advanced Magnet Lab, Palm Bay, FL, USA
[4]ITER Organization/Magnet Division, Saint Paul-lez-Durance, France

A successful development of an effective quench detection and protection method for a high temperature superconducting (HTS) coil based on a HTS coated conductor tape lays on a thorough understanding of its slowly propagating, three-dimension (3D) quench behavior. Toward this goal, a 3D micrometer scale finite element (FE) thermo-magnetostatic HTS tape model is developed and implemented in ...