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.

Optimization of the Herringbone Type Micromixer Using Numerical Modelling and Validation by Measurements

E. Tóth[1], K. Iván[1], P. Fürjes[2]
[1]Pázmány Péter Catholic University, Budapest, Hungary
[2]Research Centre for Natural Sciences Institute for Technical Physics and Materials Science Hungarian Academy of Sciences, Budapest, Hungary

COMSOL Multiphysics® software was used in this study to simulate mixing by diffusion and by secondary flow. Particle tracing model was applied to simulate the mixing of cells in the microchannel. Results agreed well with the measurement, an optimal herring-bone structure was proposed for integration into a bioanalytical system.

Effect of Magnetic Field on MR-Fluid in Ball End Magnetorheological Finishing - new

H. Garg[1], V. S. Negi[1], A. S. Kharola[1], R. Sharma[1]
[1]CSIR - Central Scientific Instruments Organization, Chandigarh, India

Magnetorheological Finishing (MRF) is one of the precision finishing processes in which magnetic field is used to drive abrading forces for Finishing 2D and complex 3D surfaces. In this paper, Ball End Magnetorheological Finishing (BEMRF) has been analyzed for fluid behaviors under the influence of strong magnetic field. Polishing action in MR-fluid depends on magnetization, magnetic intensity, ...

Tilted Micro Air Jet for Flow Control

J. Malapert[1], R. Yahiaoui[1], R. Zeggari[1], and J-F. Manceau[1]
[1]Institut Femto-St, Université de Franche-Comté Besançon, France

In this paper, we present an interesting method to microfabricate a tilted micro air jet generator. We used the well-know Deep Reactive Ion Etching (DRIE) technique in order to realize in a silicon substrate a double side etching. For aircraft and cars, micro air jets will take an important place for fluid control. Micro air jets are characterized by their speed, frequency and tilt. Usually, this ...

Modelling and Simulation of Moving Boundaries and Convective Heat Transfer in non-Autogenous Fusion Weld Pools using FEMLAB 3.1

Edstorp, M., Eriksson, K.
University of Trollhättan/Uddevalla, Dep. of Technology, Mathematics & Computer Science, Trollhättan

This article is concerned with the mathematical modelling and simulation of the thermo and fluid dynamics of the molten pool created during an arc fusion welding process with consumable electrodes. Weld pool simulation is a true multiphysics problem in that a model for a typical process such as GMAWis required to incorporate the effects on the transfer of heat and mass that are induced by ...

Helium Two-Phase Flow in a Thermosiphon Open Loop

B. Baudouy[1] and F. Visentin[1]
[1]CEA, Irfu, SACM, Gif-sur-Yvette, France

The construction of high magnetic field superconducting coils requires the use of low temperature superconductors that must be cooled down to liquid helium temperature (4.2 K). Natural two-phase convection loops, i.e. thermosiphon loop, are used as cooling system for large superconducting magnets mainly because of its passive nature. The study present a thermohydraulics model realized with COMSOL ...

Stability Analysis of a Boiling Loop in Space

W. R. Schlichting1, R. T. Lahey Jr.1, M. Z. Podowski1, and T. A. Ortega G?mez2
1Center for Mutliphase Research, Rensselaer Polytechnic Institute, Troy, NY, USA
2Institute for Nuclear & Energy Technologies, Karlsruhe Institute of Technology, Karlsruhe, Germany

Boiling systems must be analyzed to determine their stability characteristics. Multiphase system instabilities can be predicted by the use of a one-dimensional drift-flux model. Using this model, an analysis has been performed with the COMSOL code to investigate both linear and nonlinear instability phenomena. In particular, density-wave oscillations in boiling channels were investigated, and, ...

High Vacuum Gas Pumping and Boundary Coupling

M. Cavenago
INFN/LNL, Laboratori Nazionali di Legnaro, Legnaro, Italy

Many scientific instruments are based on high vacuum equipment with a gas pressure maintained in the order of 1 Pa or below. The gas flow in the low pressure limit, called the molecular flow regime, is a case of transport with zero viscosity. The ability to solve an integral equation on the boundary with finite elements methods allows us to find the gas densities and flows in the ...

Design Of A Flat Membrane Module For Fouling And Permselectivity Studies

J.M. Gozalvez-Zafrilla, and A. Santafe-Moros
Universidad Politécnica de Valencia, Valencia, Spain

Flat membrane modules are widely used to study the membrane performance at the laboratory which is influenced by pressure and velocity. Most modules designed for laboratory studies have high pressure drop and abrupt changes of flow direction what yield to lack of uniform flow and pressure uncertainty over the membrane surface. With the aim to minimize these drawbacks, we developed a new module ...

Numerical Investigation of Non-Newtonian Laminar Flow in a Curved Tube with Insert

A. Kadyyrov[1]
[1]Research Center for Power Engineering Problems, KSC, RAS, Russia

Non-Newtonian laminar flows in curved circular tubes with inserts are investigated by computer simulations. 0.65% solution of NaCMC is considered. Three-dimensional incompressible Navier-Stokes equations are solved using COMSOL Multiphysics. Placements of inserts inside the curved tubes and their effects on the hydrodynamics of the flow are studied. Computations are carried out with various ...

Numerical Modeling and Performance Optimization Study of a Diaphragm Pump for Medical Application

I. Lupelli[1], P. Gaudio[1], A. Malizia[1], R. Quaranta[1]
[1]Department of Industrial Engineering, University of Rome “Tor Vergata”, Roma, Italy

In this contribution we present the results of the numerical modeling and performance optimization study of a diaphragm pump for drug infusion. The main objective is to develop a numerical model that replicates the pumping cycle (400ms) and also provides indications about the variation of pumping performance as consequence of the variation of the chamber-diaphragm system geometry, diaphragm ...

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