Artigos Técnicos e Apresentações

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.

Thermal Model of a Radiosonde System

E. Javier[1], J. Alberto Bava[1], and G. Rodriguez[2]
[1]Facultad de Ingenieria Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina.
[2]Facultad de Astronomia y Ciencias Geofisicas Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina.

This paper describes the development of a thermal model applied to a radiosonde system that calculates the average temperature on the printed circuit board PCB of the system. Using the thermal physics module called \"Conjugated Heat Transfer” of the COMSOL utility, simulations are performed which allow modeling the atmospheric conditions of the environment that the radiosonde will be ...

Gating of Gigantic Ionic Current through Single-Walled Carbon Nanotubes

P. Krstic, and J. Park
Oak Ridge National Laboratory
Oak Ridge, TN

The gigantic magnitude features of the ionic current of electrolyte through carbon nanotubes (CNT) are explained by the dramatic increase of electroosmotic current induced by the strong slip at the CNT surface and the considerable excess volume charge inside the tube. In this study, we investigate the fundamental details of gating phenomena of such gigantic ionic current through CNT by using ...

Structural and Geomechanics Modeling of a Railroad Bridge

H. Diaz-Alvarez, R. Costley, D. Whitlow, M. McKenna, C. Williamson, and O. Taylor
US Army Engineer & Development Center
Vicksburg, MS

Previous studies have determined that bridges radiate acoustic energy in the infrasonic frequency range. Initial interest in this topic was the result of trying to identify sources of infrasound recorded at stations deployed near bridges. A Finite Element model has been developed for a Pratt truss railroad bridge located at Ft. Leonard Wood, MO. The model consists of 3-D Euler beam elements ...

Deriving Correction Factors for a Primary Standard for Radiation Dosimetry

R. Tosh, and H. Chen-Mayer
NIST
Gaithersburg, MD

Accurate metrology of radiotherapeutic absorbed dose to water requires assessing the radiation induced temperature change. The most direct method for doing this is water calorimetry, for which the established technique involves the use of slender thermistor probes that are sealed within a glass vessel containing high-purity water. The probes and vessel perturb the radiation field, via ...

Solution of Inverse Thermal Problem for Assessment of Thermal Parameters of Engineered H2 Storage Materials

I. Fedchenia, and B. van Hassel
United Technologies Research Center
East Hartford, CT

Materials based H2 storage systems for light duty vehicles need to meet challenging performance targets that have been developed by the FreedomCAR and Fuel Partnership. On-board reversible metal hydrides are typically integrated with heat transfer surfaces, e.g. in fin and tube heat exchangers, in order to reject the heat of H2 absorption at a high rate which is set by the refueling time ...

Modeling a Cooling Skylight

M. Fält, and R. Zevenhoven
Thermal and Flow Engineering Laboratory, Department of Chemical Engineering
Åbo Akademi University
Turku
Finland

Air-conditioning produced by traditional vapor compression cycle is an energy demanding operation. By using passive cooling methods is it possible to avoid, or at least reduce, the need for vapor compression cooling. A passive radiative cooling method could be a three windowed skylight, filled with a greenhouse gas. Earlier modeling of such a skylight has shown promising results, and work has ...

Electromagnetic and Coupled Field Computations: A Perspective

S. V. Kulkarni
Indian Institute of Technology
Bombay, India

S. V. Kulkarni a Professor in Electrical Engineering Department, Indian Institute of Technology, Bombay, India. Previously, he worked at Crompton Greaves Limited and specialized in the design and development of transformers up to 400 kV class. He has authored book \"Transformer Engineering: Design and Practice\" published by Marcel Dekker, Taylor & Francis Group. The author of more than 120 ...

Electrowetting-On-Dielectric Induced Droplet Actuation in M x N Array of Electrode

S. Sohail[1], D. Das[1], S. Das[2], and K. Biswas[1]
[1]Electrical Engineering Department, IIT Kharagpur
[2]School of Medical Science and Technology, IIT Kharagpur

Digital microfluidic system based on EWOD (electrowetting-on-dielectric) technology can perform different fluidic operations on the same electrode array by simply modifying control software. One of the major challenges in EWOD device is to address each electrode individually in M x N array of electrode using simple fabrication architecture without compromising in system performance. The ...

Optimization of the Design Parameters of a Piezoelectric Actuator

G. Srivastava[1], R. Sharma[1], A. Goswami[2], A. Phani[2], and R. K. Dwivedi[1]
[1]Jaypee Institute of Information Technology, India
[2]Indian Institute of Science, India

In this work a cantilever beam has been chosen as the element of study, consisting of a piezoelectric polymer like PVDF with a thin permalloy layer coating on one side of it. This piezoelectric cantilever is designed using COMSOL software. It is seen that the deflection of the tip of a unimorph cantilever is dependent on its geometric dimension, type of material and the applied field. Hence in ...

Homogenized models of electrically-coupled excitable tissues

P. Goel

IISER
Pune
India

Pranay Goel received his B. Tech. in Engineering Physics from IIT Bombay, and MS and PhD in Physics from the University of Pittsburgh in 2003. He went on to two postodoctoral positions, the first at the Mathematical Biosciences Institute, The Ohio State University, and another at the Laboratory of Biological Modeling, The U.S. National Institutes of Health. He has been with IISER Pune since 2009, ...

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