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.

Conjugate Heat Transfer Analysis On Microchannel Heat Sinks For High Power LEDs

D. Chakravarthii [1]
[1] Universiti Sains Malaysia, Malaysia

Light emitting Diode (LED) has been proved to be the best resource for commercial as well as industrial lighting applications. However, thermal management in high power LEDs is a major challenge in which the thermal resistance (Rth) and rise in junction temperature (TJ) are notable parameters. Heat dissipation in the LED has been partly achieved with the evolution of efficient heat sinks. This ...

Sound Pressure Amplification Using FP Resonance of Acoustic Metamaterial Cavity

J. Kim [1]
[1] Department of Mechanical Engineering, Hongik University, South Korea

Metamaterials are periodic or quasi-periodic, sub-wavelength metal structures. The material properties are derived from its structure rather than inheriting them directly from its material composition.

Simulation of a Heated Tool System for Jet Electrochemical Machining

M. Hackert[1], G. Meichsner[2], and A. Schubert[1][2]

[1]Chair Micromanufacturing Technology, Faculty of Mechanical Engineering, Chemnitz University of Technology, Chemnitz, Germany
[2]Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany

Jet Electrochemical Machining (Jet-ECM) is an unconventional procedure using localized anodic dissolution for micromachining. An increasing of the electrolyte temperature will lead to an increase of the electrical conductivity of the electrolyte by about 30% and to a reduction of the dynamic viscosity of the electrolyte by about 25 %. Both will improve the process. Therefore a Jet-ECM tool ...

Multi-Scale Modelling of Catalytic Microreactors

B. Hari[1] and C. Theodoropoulos[1]
[1]The University of Manchester, School of Chemical Engineering and Analytical Science, Manchester, UK

Microreactors are important alternative to conventional reactors in chemistry, chemical, pharmaceutical and semiconductor industries due to their operation characteristics such as increased mass and heat transfer, uniform flow, safety, high throughput through array configurations, smaller plant size and lower cost of production. Models for such reactors need to be able to describe both the ...

A Modular Platform for Cell Characterization, Handling, and Sorting by Dielectrophoresis

S. Burgarella[1], B. Dell’Anna[2], V. Perna[1], G. Zarola[2], and S. Merlo[2]

[1]STMicroelectronics, Agrate Brianza, MI, Italy
[2]Dipartimento di Elettronica, Università degli Studi di Pavia, Pavia, Italy

Dielectrophoresis (DEP) is a method for cell manipulation without physical contact in lab-on-chip devices, since it exploits the dielectric properties of cells suspended in a microfluidic sample, under the action of locally generated high-gradient electric fields. The DEP platform that has been developed offers an integrated solution for customizable applications. Several functional units, ...

Simulation of Transport of Lipophilic Compounds in Complex Cell Geometry

Q.A. Chaudhry[1], M. Hanke[1], and R. Morgenstern[2]
[1]School of Computer Science and Communication, Royal Institute of Technology, Stockholm, Sweden
[2]Karolinska Institutet, Stockholm, Sweden

The mathematical modeling of the diffusion and reaction of toxic compounds in mammalian cells is tough task due to their very complex geometry. The heterogeneity of the cell, particularly the cytoplasm, and the variation of the cellular architecture, greatly affects the behavior of these toxic compounds. Homogenization techniques have been implemented for the numerical treatment of the model. ...

Passive and Active Deformation Processes of 3D Fibre-Reinforced Caricatures of Cardiovascular Tissues

A. Di Carlo[1], P. Nardinocchi[2], T. Svaton[3], and L. Teresi[1]

[1]Modelling and Simulation Lab, Università Roma Tre, Roma, Italy
[2]Dept. of Structural & Geotechnical Engineering, Università di Roma La Sapienza, Roma, Italy
[3]Dept. of Mathematics, University of West Bohemia, Pilsen, Czech Republic

In this paper, we present a mathematical model of contractile elastic solids meant to simulate various districts of the cardiovascular system, and based on the concepts of active deformation and embedded muscle fibres. Specifically, here we deal with the modeling of the gross mechanics of the Left Ventricle (LV) which is strictly related to its pump function. As is well known, the effectiveness ...

Stress Field Simulation for Quantitative Ultrasound Elasticity Imaging

L. Yuan[1] and P.C. Pedersen[1]
[1]Department of Electrical and Computer Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts, USA

Finite element models using COMSOL Multiphysics and MATLAB were developed to solve the problem of stress distribution interior homogeneous, isotropic, incompressible elastic solid material under known vertical external compression with a rectangular contact surface. Moreover, comparison between these results and analytical solutions was used to further validate that stress drops off with ...

Finite-Element Evaluation of Thermal Response Tests Performed on U-Tube Borehole Heat Exchangers

E. Zanchini, and T. Terlizzese
[1]Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale, Università di Bologna, Bologna, Italy

The results of two thermal response tests recently performed on two vertical borehole heat exchangers (BHEs) are presented. The BHEs have the same cross section and a depth of 100 m and 120 m respectively. The evaluation of the thermal properties of the ground and grout are performed by a finite-element simulation method, developed through the software package COMSOL Multiphysics 3.4.

Electric Field Distributions and Energy Transfer in Waveguide-Based Axial-Type Microwave Plasma Source

H. Nowakowska[1], M. Jasínski[1], and J. Mizeraczyk[1,2]
[1]The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Gdansk, Poland
[2]Dept. of Marine Electronics, Gdynia Maritime University, Gdynia, Poland

In this paper, we examine changes of the electric field distributions in waveguide-based axial-type microwave plasma source (MPS) during tuning procedure. The distributions strongly depend on position of the movable short, so does the wave reflection coefficient of the incident wave. A method of determining tuning characteristics of the MPS consisting in treating the MPS as a two-port network, ...

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