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.

Flow of Dry Foam in a Pipe

M. Divakaran[1], S. K. Gupta[1]
[1]Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka, India

Due to the coupling of foam flow with foam generation step, the earlier studies on foam flow have not led to consistent results. An increase in flow rate to obtain ?P vs. Q data changes the foam under investigation itself. The controlled experiments carried out earlier in our group show that ?P increases with flow rate as Q^2/3, a weaker dependence than that known for laminar flow or plug flow ...

Modelling the Response of Microdialysis Probes in Glucose Concentration Measurement

J.M. Gozálvez-Zafrilla[1], A. Santafé-Moros[1], J.L. Díez-Ruano[2], J. Bondia[2]
[1]Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM) - Universitat Politècnica de Valencia, Valencia, Spain
[2]Instituto Universitario de Automática e Informática Industrial (AI2) - Universitat Politècnica de Valencia, Valencia, Spain

Microdialysis is a technique of continuous glucose monitoring in diabetic patients. In microdialysis, a saline serum is perfused into a microdialysis probe. Glucose pass from the plasmatic fluid through the porous membrane. The glucose concentration in the dialysate obtained is measured by an external analytical device. This preliminary work aimed to obtain a model to relate glucose ...

An Approach to Modeling Vacuum Desorption - new

C. F. Gomez[1], R. Schunk[1], R. F. Coker[1], J. Knox[1]
[1]NASA Marshall Space Flight Center, Huntsville, AL, USA

The objective of this simulation effort is to develop a mathematical model of vacuum desorption on a POC (Proof of Concept) canister loaded with Zeolite 13X/5A . This canister contains a pelletized adsorption bed which is used to adsorb H2O and CO2. Once this bed is fully saturated with an equilibrium loading, desorption is then accomplished by reducing the pressure to near vacuum. This type of ...

Multiscale Simulation of a Photocatalytic Reactor for Water Treatment - new

A. Cockx[1], R. Degrave[1], P. Schmitz[1]
[1]University of Toulouse, Toulouse, France

This study deals with the 3D modeling of a light photocatalytic textile. This process aims to decontaminate industrial effluents such as water with pesticides. The present study describes the implementation of a reactive transport model in a computational fluid dynamics model developed on a Representative Volume Element (RVE) of the textile, i.e. at the microscopic scale. The final ...

Modeling the iodine removal efficiency and temperature behavior for an FADS charcoal filter by FEMLAB

Qin, Z.1, Wren, J.C.1, Moore, C.J.2
1 Department of Chemistry, The University of Western Ontario, London, Ontario, Canada
2 Chalk River Laboratories, Atomic Energy of Canada Limited Chalk River, Ontario, Canada

A key component of the Filtered Air Discharge System in nuclear power reactors is a charcoal filter, intended to remove gaseous fission products, mainly radioiodine, in the unlikely event of an accident. Models for removal of CH3I and temperature behaviour of a charcoal filter have been described. The CH3I removal model is based on a mass balance equation consisting of CH3I transport due to ...

COMSOL Modelling of the Gas Mixing Process in a Ripple Reducer for NPL’s Time Division Dilution System

J. Wang, B.A. Goody, and M.J.T. Milton
National Physical Laboratory, Teddington, Middlesex, UK

The mixing process of a ripple reducer designed for a time division dilution system (TDD) that dynamically generates calibration gas mixtures is modelled in 2D using COMSOL Multiphysics. The model can been used to visualize and optimize the mixing process and extract parameters of interest at chosen times and positions. The simulated time response of an analyte concentration agrees with ...

Simulation of Chromatographic Band Transport

B. Bunner , A. Kromidas , M. Kele , and U. Neue
Waters Corp, Milford, MA, USA

High-Performance Liquid Chromatography (HPLC) is a standard method in the pharmaceutical industry for the separation and identification of chemical compounds. Modeling of band transport, or band broadening phenomena, can provide tremendous insight into problems of chromatography that are difficult or impossible to measure experimentally. We used COMSOL to analyze two classes of problems in HPLC: ...

Modeling Of A Strongly Coupled Thermal, Hydraulic And Chemical Problem: Drying And Low-Temperature Pyrolysis Of Chromated Copper Arsenate (CCA)-Wood Waste Particles In A Moving Bed Reactor

J. Govaerts[1], and L. Helsen[2]
[1]SCK-CEN, Belgian Nuclear Research Centre, Performance Assessment Unit, Mol, Belgium
[2]Department of Mechanical Engineering, Division of Applied Mechanics and Energy Conversion, Katholieke Universiteit Leuven, Heverlee, Belgium

Low temperature thermal carbonisation might be the ultimate solution to the growing disposal problem of CopperChromeArsenic-treated waste wood. This energy and material recuperating technology is currently in the process of upscaling to an industrial level. In the present study, a numerical model is developed in COMSOL Multiphysics that allows to investigate the temperature profiles, gas ...

Numerical Simulations of Radionuclide Transport through Clay and Confining Units in a Geological Repository using COMSOL

J. Hansmann[1], M. L. Sentis[1], B. J. Graupner[1], A.-K. Leuz[1], C. Belardinelli[2]
[1]Swiss Federal Nuclear Safety Inspectorate (ENSI), Brugg, Switzerland
[2]Kantonsschule Solothurn, Solothurn, Switzerland

Introduction: The sectoral plan that defines the procedure and criteria of site selection for deep geological repositories for all categories of waste (high-level and low- and intermediate-level waste) in Switzerland started in 2008 and will last for about ten years. ENSI (Swiss Nuclear Safety Inspectorate) is in charge of reviewing the proposals and safety assessments for geological repositories ...

Experimental Validation of Model of Electro-Chemical-Mechanical Planarization (ECMP) of Copper

J. Ebert[1], S. Ghosal[1], A. Emami-Naeini[1]
[1]SC Solutions, Sunnyvale, CA, USA

This paper describes the development of a COMSOL model of Electro-Chemical-Mechanical Planarization (ECMP) that was validated with experimental data. ECMP is used for processing of semiconductor wafers. We developed a 2D model of flow of phosphoric acid solution (the electrolyte) between two parallel plates that focuses on the physics and electrochemistry in ECMP. The model includes steady-state ...

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