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.
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COMSOL News Magazine 2017

Design of a Pressure Sensor to Monitor Teeth Grinding

I.M. Abdel-Motaleb[1], K. Ravanasa[1], K.J. Soderholm[2]
[1]Department of Electrical Engineering, Northern Illinois University, DeKalb, IL, USA
[2]Department of Restorative Dental Sciences, College of Dentistry, University of Florida, Gainesville, FL USA

Studying teeth grinding behavior and other oral conditions requires the ability to accurately measure the pressure on the teeth. Placing a sensor in the mouth requires small size devices with powering and measurement techniques that do not hinder the normal life of the patient. To meet these requirements, we designed, using COMSOL, a small, easy to read MEMS capacitive force sensor, with ...

Modeling Internal Heating of Optoelectronic Devices Using COMSOL

N. Brunner[1][,][2]
[1]Voxtel, Inc, Beaverton, OR, USA
[2]University of Oregon, Eugene, OR, USA

In this paper the heat transfer module in COMSOL is utilized to simulate internal heating of an Avalanche Photodiode due to light-induced current through a resistivity that depends on charge carrier concentrations in the device. Initial tests are done by modeling the heating process on a previously-solved silicon p-n junction as a proof of concept before advancing to a more complicated geometry. ...

Optimization of Artificial Diffusion Stabilization Techniques and Corresponding Mesh Density Distribution in Drift Dominated Transport of Diluted Species

J. Jadidian[1], M. Zahn[1], N. Lavesson[2], O. Widlund[2], K. Borg[2]
[1]Massachusetts Institute of Technology, Cambridge, MA, USA
[2]ABB Corporate Research, Västerås, Sweden

This paper presents an optimized combination of artificial diffusion techniques to stabilize a drift dominated streamer discharge model which includes COMSOL Multiphysics’ Transport of Diluted Species modules for positive ion, negative ion, and electron charge densities, coupled through the Electrostatic module. A Thermal Conduction and Convection module is responsible for the heat transfer in ...

Modeling a Combined Photovoltaic-Thermal Panel

E. Gutierrez-Miravete[1], B. Fontenault[2]
[1]Rensselaer Polytechnic Institute, Hartford, CT, USA
[2]General Dynamics-Electric Boat, Groton, CT, USA

A novel combined photovoltaic-thermal panel can simultaneously increase the conversion efficiency of the PV cell and utilize some of the excess thermal energy created by the conversion process (see Figure 1). The Conjugate Heat Transfer physics in COMSOL was used to create a two-dimensional, steady state model of such a combined photovoltaic cell-thermal panel. Figure 2 shows a magnified view of ...

Orientation of Piezoelectric Crystals and Acoustic Wave Propagation

G. Zhang[1]
[1]Clemson University, Clemson, SC, USA

Surface acoustic wave (SAW) devices are commonly used as wireless filters, resonators, and sensors. The confinement of acoustic energy near the surface of a piezoelectric substrate in a SAW sensor makes it highly sensitive for discerning surface perturbation. As sensors, SAW devices have the potential to provide a high-performance sensing platform with capabilities of remote and high-temperature ...

Modeling of the Reduction Stage during the Continuous Refining of Copper in a Packed Bed Reactor

F. Mansilla[1], L. Voisin [2]
[1]Advanced Mining Technology Center, Chile University, Santiago, Chile
[2]Department of Mining Engineering, Advanced Mining Technology Center, Chile University, Santiago, Chile

Throughout history, the copper pyrometallurgical processes have been carried out mostly in discontinuous or batch systems. In recent decades new continuous technologies have been developed but focused only on Smelting and Converting stages leaving aside the Refining one. In 2002 a novel technology was proposed by the Department of Mining Engineering of Chile University which consists in two ...

Thermo-Fluid Dynamics of Flue Gas in Heat Accumulation Stoves: Study Cases

D. Rossi[1], P. Scotton[1]
[1]University of Padova, Department of Geosciences, Padova, Italy

The research aims to clarify some aspects of the thermo-fluid dynamics of woody biomass flue gas, within the twisted conduit inside the heat accumulation stoves, and exposes also some analysis about the heat transport and heat exchange processes. The high temperature flue gas flows in the conduit, releasing heat to the refractory. The heat stored in the refractory is then released to the ...

Early Stage Melt Ejection in Laser Percussion Drilling

T. Eppes[1]
[1]University of Hartford, Hartford, CT, USA

Laser percussion drilling is widely used in the aerospace industry to produce cooling holes in jet engine components. This process is a thermal, contact-free process which involves firing a sequence of focused optical pulses onto a target material [1-4]. During each optical pulse, the central portion of the target area heats to a liquid then vapor state where the expanding gas produces a recoil ...

Design and Nuclear-Safety Related Simulations of Bare-Pellet Test Irradiations for the Production of Pu-238 in the High Flux Isotope Reactor Using COMSOL

J.D. Freels[1], P.K. Jain[1], R.W. Hobbs[1]
[1]Oak Ridge National Laboratory, Oak Ridge, TN, USA

The Oak Ridge National Laboratory (ORNL) is developing technology to re-establish the capability to produce plutonium-238 for the National Aeronautics and Space Administration (NASA) as a power source material for powering vehicles while in deep-space. The High Flux Isotope Reactor (HFIR) of ORNL has been utilized to perform test irradiations of in-capsulated neptunium oxide (NpO2) and aluminum ...

Computationally Assisted Design and Experimental Validation of a Novel ‘Flow-Focussed’ Microfluidics Chip for Generating Monodisperse Microbubbles

M. Conneely[1], V. Hegde[2], H. Rolfsnes[1], A. Mason[2], D. McLean[1], C. Main[1], F.J.D. Smith[2], W.H.I. McLean[2], P.A. Campbell[1]
[1]Carnegie Physics Laboratory, University of Dundee, Dundee, Scotland, United Kingdom
[2]Division of Molecular Medicine, University of Dundee, Dundee, Scotland, United Kingdom

Whilst initially developed as a diagnostic aid to improve echogenicity in ultrasound imaging, gas-filled lipid microbubbles are now emerging as a next generation \'theranostic\' tool in the medical arena. Here, their therapeutic potential has now been realized through their unique capability to deliver molecular species such as drugs and genes by means of disrupting the cell membrane in response ...