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.

Providing an Entry Length in Heterogeneous Catalytic Reactors with Fast Diffusion

D. Dalle Nogare[1] and P. Canu[1]

[1]Department of Chemical Engineering Principles and Practice, University of Padova, Padova, Italy

This work investigates the effects of boundary conditions on the species profiles in heterogeneous catalysis, with low Péclet systems. Hydrogen combustion in Helium was chosen because of the high diffusivities. Furthermore, already at T=300°C over a Pt catalyst, kinetics is very fast and the composition gradients at the inlet extremely steep. The issue is analyzed with 1D models, ...

A Finite Element Analysis on the Modeling of Heat Release Rate, as Assessed by a Cone Calorimeter, of Char Forming Polycarbonate

D. Statler[1], and R. Gupta[2]
[1]Mid-Atlantic Technology, Research and Innovation Center, South Charleston, WV, USA
[2]Department of Chemical Engineering, West Virginia University, Morgantown, WV, USA

During the pyrolysis and combustion of polymers, heat is released and is typically measured with a cone calorimeter to better assess the polymer’s flammability. Modeling heat release rate, as assessed by cone calorimetry, has not been extensively studied for char-forming polymers, such as, polycarbonate. Here we determine the heat release rate with the help of a one-dimensional transient finite ...

Analyte Capture from Liquid Samples: Size Matters

M. Weber[1], M. Reed[1]
[1]Yale University, New Haven, CT, USA

Arrays of vertical pillars, Micro Purification Chips, have been widely used for analyte capture from liquid samples [Henderson et. al, 2006], [Toner et. al, 2007], [Stern et. al, 2010]. However exact understanding of the capture efficiency mechanisms has not been previously explained. Here we present a model in COMSOL Multiphysics® which calculates analyte capture efficiency based on initial ...

Optimization of Around-The-End Hydraulic Mixer Using COMSOL Multiphysics®

S. Mohammadighavam[1], B. Kløve[1]
[1]University of Oulu, Department of Process and Environmental Engineering ,Oulu, Finland

After rapid mixing of waste water and coagulant, an effective slow mixing during a reasonable retention time will cause to grow the size of flocs up which will settle out easily. Around-the-end hydraulic mixer with barriers is one of the efficient facilities that have been used in water treatment plants for this purpose. A uniform velocity gradient (G) is needed to achieve efficient mixing and ...

Dynamic adsorption with FEMLAB, modeling breakthrough curves of gaseous pollutants through activated carbon beds

Joly, A.1, Volpert, V.1, Perrard, A.2
1 Institut Camille Jordan (ICJ), CNRS UMR 5208, Mathématiques, Université Claude Bernard Lyon, Villeurbanne Cedex, France
2 Institut de Recherches sur la Catalyse, CNRS UPR 5401, Villeurbanne Cedex, France.

The purpose of this presentation is to expose how to apply FEMLAB to model the dynamic adsorption through adsorbent columns and to use the results of the numerical simulations to interpret the experiments. The mathematical formulation of the phenomena leads to a system of two partial differential equations (mass balance and adsorption rate), which can be solved in most cases only after ...

Reaction and Thermal Modeling of a Packed Bed Reactor for Hydrogen Storage

T. Williams1, K. Gazda1, A. Kindler2, Y. Huang2, D. Karner3, J. Read4
1GreenMountain Engineering, San Fransisco, CA, USA
2Jet Propulsion Laboratory, California Institute of Technology, CA, USA
3ETEC, Phoenix, AZ, USA
4ECOtality, Scottsdale, AZ, USA

Energy storage is an increasingly important area of research both for use in alternative transportation and to enable the widespread use of intermittent energy sources such as wind and solar energy. This paper presents a multiphysics model of a novel technology for hydrogen storage, in which hydrogen is stored in a packed bed of metal hydride and released by application of steam through a number ...

Modelling of Reactive Non-Isothermal Mixture Flow and its Simulation in COMSOL Multiphysics® Software - new

V. Orava[1,2], O. Soucek[1], P. Cedula[2]
[1]Charles University in Prague, Prague, Czech Republic
[2]Zurich University of Applied Sciences, Winterthur, Switzerland

I introduce a model of fluidized reactor which, in presence of heterogeneous platinum-based catalyst, decomposes liquid formic acid producing gaseous mixture of carbon dioxide and hydrogen as the product. I treat the physical system as a (Class II) mixture of four constituents - namely formic acid (FA), Platinum micro-pellets (Pt), carbon dioxide (CO_2) and hydrogen (H_2) - which can be, without ...

Network-of-Zones Model for Stirred Tank with Fractal Impeller - new

G.M. Mule[1], A.A. Kulkarni[1]
[1]CSIR - National Chemical Laboratory, Pune, Maharashtra, India

Stirred tanks are widely used in the pharmaceuticals, chemical and paint industries for variety of operations. The fractal impeller is an impeller having a novel design, developed by CSIR-National Chemical Laboratory, Pune, India. The power number of fractal impeller is relatively lower than the conventional impellers. The mixing performance is also relatively better than the conventional ...

Analysis of Heat, Mass Transport, and Momentum Transport Effects in Complex Catalyst Shapes for Gas-Phase Heterogeneous Reactions Using COMSOL Multiphysics

A. Nagaraj[1], and P. Mills[2]

[1]Department of Electrical Engineering and Computer Science, Texas A&M University, Kingsville, TX, USA
[2]Department of Chemical and Natural Gas Engineering, Texas A&M University, Kingsville, TX, USA

The global demand for sulfuric acid has been forecast to grow at an average of 2.6% per year from 2005 – 2010. The primary objective of this work is to analyze the performance of various heterogeneous catalyst shapes that have been proposed for the oxidation of SO2 to SO3 used in the manufacture of sulfuric acid. COMSOL Multiphysics provides a powerful numerical platform for simulation of ...

Modeling of an Oxygenation-Aided 3D Culture for Functional Beta-Cell Expansion

S. Jin[1], J. McReynolds[1], X. Li[2], J. Guan[2]
[1]Department of Biomedical Engineering, College of Engineering, University of Arkansas, Fayetteville, AR, USA
[2]Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA

Currently, researchers are looking for ways to mass-produce biologically functional pancreatic beta cells in vitro because of the shortage of donor tissue needed for diabetes cell therapy. The beta cells will become hypoxic if their high oxygen demands are not met. We hypothesized that the biological function of beta cells can be improved if they are cultured in a 3D collagen scaffold, which ...

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