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.

Numerical Simulation of Crystallinity Distribution Developed In the Extrusion of Thick Walled Polypropylene Pipe

R. D. Wilcox1, and J. Collier2
1Chemistry Department, Lincoln Memorial University, Harrogate, TN, USA
2Chemical Engineering Department, Florida State University, Tallahassee, FL, USA

In a numerical simulation for crystallinity distribution, a 36 cm diameter polypropylene pipe with 3.7 cm wall thickness consisting of 3 subdomains that include a die, cooling box, and take-off section was modeled in a 2D axisymmetric geometry using COMSOL Multiphysics.The generalized heat transfer module was used to solve for the temperature distribution in the flowing melt using conductive and ...

Kinetics of the Carbothermal Reduction of Ilmenite: Grain Pellet Model

S. Savithri[1], and M. S. Manju[1]
[1] National Institute for Interdisciplinary Science and Technology Trivandrum, India.

  A novel mechanism for the carbothermal reduction of Ilmenite is proposed and validated with the help of a comprehensive mathematical model. A time-dependent isothermal pellet-grain model is used to simulate the kinetic behaviour of a spherical pellet of ilmenite (FeTiO   3) in CO/CO2 atmosphere. The proposed mechanism involves diffusion of CO gas through the  ores of the ...

Numerical Simulation of Pulsed TIG Welding Partial and Full Penetration

A. Traidia[1][2], F. Roger[1], and E. Guyot[2]

[1]Ecole Nationale Supérieure de Techniques Avancées, Palaiseau, France
[2]AREVA NP, Centre Technique Soudage, France

In this poster, a numerical model of spot pulsed current TIG welding for partially and fully penetrated weld pools is presented. Heat transfer and fluid flow in the weld pool driven by the combination of electromagnetic force, buoyancy force, surface tension gradient and latent heat are included in our model. A new formulation of the electromagnetic problem is introduced to take into account eddy ...

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 ...

Electrostatic Screening Effects between Vertically Aligned Carbon Nanotubes and Fast Transient Joule Heating during Field Emission

M. Dionne, J.-L. Meunier, and S. Coulombe
Department of Chemical Engineering, McGill University, Montreal, QC, Canada.

To minimize the erosion of arc electrodes, surface melting must be avoided by optimizing field emission. This can be achieved through the use of sharp structures in the design of the surface topography.Carbon nanotubes standing vertically on metal substrates are good candidates for the creation of new electrodes fulfilling these requirements but their dimensions and density on the substrate must ...

Modeling of Different Shaped Micro-Cantilevers Used as Chemical Sensors

G. Louarn, M. Collet, and S. Cuenot
Institut des Matériaux Jean Rouxel, Nantes

In this work, we present the modeling of V-shaped silicon micro-cantilevers. The sensitivity of different V-shaped silicon cantilevers is estimated, as a function of the geometrical dimensions of the cantilever.

Benchmarking COMSOL - Part 2: CFD Problems

Darrell Pepper
Professor of Mechanical Engineering,
University of Nevada - Las Vegas

Using COMSOL 3.5a, a set of benchmark problems requiring the use of the COMSOL Computational Fluid Dynamics (CFD) module has been simulated. Several of the problems include fluid-heat transfer interactions (Computational Heat Transfer - CHT). The four problems are: flow over a 2-D circular cylinder compressible flow in a shock tube incompressible heated flow over a 2-D backward facing step ...

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, ...

Simulation Of Heat Generation From Vibration In COMSOL Multiphysics

G. Raghuraman, and M. Arunachalam
HCL Technologies Ltd, Chennai, Tamil Nadu, India

Vibrations are an essential part of our day to day engineering environment, which happen in automobiles, avionics, machines, electric motors, structures, electronic equipments, etc. When a system is vibrating under higher frequencies leads to higher displacement, noise and heat generation. Thus it is essential to study these effects of vibrations to improve the stability of parts in machines. In ...

Hydro-Mechanical Modelling of a Shaft Seal in a Deep Geological Repository

D. Priyanto
Atomic Energy of Canada Limited, Pinawa, MB, Canada

The hydro-mechanical (HM) numerical simulation of a shaft seal installed at a fracture zone in a hypothetical host rock using COMSOL is presented. Two different stages are considered in the numerical modelling. Stage 1 simulates the groundwater flow into an open shaft. Stage 2 simulates the groundwater flow after installation of shaft sealing-components. The shaft sealing components include: ...

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