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.

State of Charge (SOC) Governed Fast Charging Method for Lithium Based Batteries

F. Naznin[1]
[1]TVS Motor Company Ltd., Hosur, Tamil Nadu, India

The proposed State of Charge (SOC) governed fast charging method for secondary lithium based batteries charges a battery many times faster than the normal Constant Current-Constant Voltage (CC-CV) charging and reduces the side-effects generally accompanied by various fast charging methods. The proposed charging algorithm takes into account the varying internal impedance of the battery at ...

Comparison of Darcy's Law, the Brinkman Equation, the Modified Navier-Stokes Equation and the Pure Diffusion Equation in PEM Fuel Cell Modeling

Z. Shi and X. Wang
Oakland University, Rochester, MI, USA

A two dimensional isothermal single phase PEM fuel cell model is developed and implemented in COMSOL Multiphysics, where Darcy's law, the Brinkman equation, the modified Navier-Stokes equation, and the pure diffusion equation are applied separately in porous electrodes. Three values of GDL permeability are investigated. Additionally, the order of the magnitude of each term in the modified N-S ...

Optical and Electrical Modeling of Three Dimensional Dye Sensitized Solar Cells

P. Guo[1]
[1]Northwestern University, Evanston, IL, USA

Dye sensitized solar cells (DSSCs) have received tremendous attention as alternative photon harvesting devices. While the sintered TiO2 nanoparticle network attached with dye molecules achieves efficient photon absorption, the electrons have to diffuse through the long TiO2 network to reach the contact, resulting in a high electron density and thus increased recombination. Extensive research ...

CVD Graphene Growth Mechanism on Nickel Thin Films

K. Al-Shurman[1], H. Naseem[2]
[1]The Institute for Nanoscience & Engineering, University of Arkansas, Fayetteville, AR, USA
[2]Department of Electrical Engineering, University of Arkansas, Fayetteville, AR, USA

Chemical vapor deposition is considered a promising method for synthesis of graphene films on different types of substrate utilizing transition metals such as Ni. However, synthesizing a single-layer graphene and controlling the quality of the graphene CVD film on Ni are very challenging due to the multiplicity of the CVD growth conditions. COMSOL Multiphysics® software is used to investigate ...

Design of a MEMS Capacitive Comb-drive Accelerometer

T. Kaya[1], B. Shiari[2], K. Petsch[1], and D. Yates[2]
[1]Central Michigan University, School of Engineering and Technology, Mount Pleasant, MI
[2]University of Michigan, Dept. of Electrical Engineering and Computer Science, Ann Arbor, MI

In this work, a MEMS low-g accelerometer with three sensitive directions is designed for health monitoring applications. The accelerometer may have different sensitivity in different axes. The proof-mass of the device is suspended by four serpentine springs, and the comb drive structure is used to form the differential capacitor to measure the displacement of the proof-mass. The structure has an ...

Dynamics of Rotors on Hydrodynamic Bearings

R. Eling[1]
[1]Mitsubishi Turbocharger & Engine Europe, Almere, The Netherlands

This study presents a rotordynamic analysis of a rotor on hydrodynamic bearings using COMSOL Multiphysics®. In this paper, the complexity of the model is gradually increased. Starting point of the analysis is the modal analysis of the rotor in free-free conditions. A Reynolds model is set up to predict the film pressure distribution under shaft loading. Due to the cross coupling terms of the ...

Simulation of Cyclic Voltammetry of Ferrocyanide/Ferricyanide Redox Reaction in the EQCM Sensor

H. Kwon, and E. Akyiano
Dept. of Engineering and Computer Science
Andrews University
Berrien Springs, MI

In this paper, the cyclic voltammetry behavior of Ferrocyanide/Ferricyanide, which is commonly used for electrochemical DNA detection experiment, was studied in the commercial EQCM-D setup (Q-sense) using the COMSOL Multiphysics. The model was established in a 3D geometry of QCM liquid cell. The simulation shows depletion of concentration of ferrocyanice following applied electrode potential. ...

Tunable MEMS Capacitor for RF Applications

H. S. Shriram[1], T. Nimje[1], D. Vakharia[1]
[1]BITS Pilani, Rajasthan, India

Radio Frequency MEMS devices have emerged to overcome the problem of high losses associated with semiconductors at high frequencies. A tunable MEMS capacitor is a micrometre-scale electronic device whose capacitance is controlled through different actuation mechanisms which govern the moving parts. It can have electrostatic or electrothermal actuators depending on the functional complexity and ...

Surface Plasmon Resonance

J. Crompton[1], S. Yushanov[1], L.T. Gritter[1], K.C. Koppenhoefer[1]
[1]AltaSim Technologies, Columbus, OH, USA

The resonance conditions for surface plasmons are influenced by the type and amount of material on a surface. Full insight into surface plasmon resonance requires quantum mechanics considerations. However, it can be also described in terms of classical electromagnetic theory by considering electromagnetic wave reflection, transmission, and absorption for the multi-layer medium. The two commonly ...

Design & Development of Helmholtz Coil for Hyperpolarized MRI

V. Bhatt, R.S Rautela, P. Sharma, D.C. Tiwari, and S. Khushu
Institute of Nuclear Medicine & Allied Sciences (DRDO), Delhi, India

The Helmholtz Coil generates a uniform magnetic field. The commercially available large-size Helmholtz coils prove to be very expensive. This paper describes the economical method of designing and construction of a Helmholtz coil. COMSOL Multiphysics AC/DC Module simulated results and actual results were compared in this study. The coil serves as a component in the system for Hyperpolarisation of ...

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