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.

Simulation of the Capacitive Double Layer at the Interface between Microelectrodes and Cortical Tissue Using Comsol Multiphysics and SPICE Modeling

R.M. Field, and M. Ghovanloo
NC-Bionics Laboratory, North Carolina State University

The interface between microelectrodes and biological tissue is of great interest to researchers working on extracellular stimulation. In this paper, we outline a method used to model the complex double layer capacitance at the interface between the electrodes and the cortex. This model relies on the combined power of SPICE, MATLAB, and COMSOL Multiphysics. The goal of this model is to ...

Solidification of a Liquid Metal Droplet Impinging on a Cold Surface

Tanai L. Marin,
Faculty of Physics and Mathematics Sciences,
Department of Mining Engineering,
University of Chile,
Santiago, Chile

A method for the solidification of a free surface liquid phase is presented and solved with COMSOL Multiphysiscs using a fixed grid. In this case, the Level set method with phase re-injection for mass conservation is used to prescribe the movement of the free surface of the liquid droplet, whereas a modified version of the method presented by Voller and Prakash is used to account for the ...

Simulation of DNA Hybridization Kinetics in Open Electrokinetic Microchannels

J.R. Pascault, and H.S. Zhou
Worcester Polytechnic Institute, Department of Chemical Engineering, Microfluidics and Biosensors Laboratory

In this study, we show that the specific DNA hybridization is diffusion limited; whereas the non-specific hybridization is reaction limited. By means of an electrical field, DNA is put in motion. It results in an overallenhancement of the kinetics and a better ratio of specific hybrids over total hybrids.

Simulation of an Electrical Impedance Based Microfluidic Biosensor for Detection of E.coli Cells

B. Srinivasan[1], S. Tung[1], Y. Li[2], and M. Varshney[2]
[1] Department of Mechanical Engineering, University of Arkansas
[2] Department of Biological and Agricultural Engineering, University of Arkansas

The impedance based biosensor utilizes the electrical impedance measurements between interdigitated electrodes integrated into a microchannel containing the target cells in a suspension medium. The detection is based on measuring the change in impedance caused by the presence of bacteria. In this paper we describe the simulation of impedance measurements using the electromagnetics module of ...

FEM Simulation of a Micro-Cantilever Optical-MEMS Sensor

V. Mathur, J. Li, and W.D. Goodhue
Photonics Center, Department of Physics and Applied Physics, University of Massachusetts, Lowell

In this work a micro-cantilever optical-MEMS sensor based on the AlGaAs system is designed and modeled. The device consists of two micro-cantilever beams perfectly aligned with the free ends separated by approximately 200 nm up to 2000 nm. The finite element method (FEM) (COMSOL Multiphysics) has been employed here to model the structural deformation and light propagation through the device. ...

Quasi-static Analysis of Shielded Microstrip Lines

S.M. Musa, and M.N.O. Sadiku
Prairie View A&M University, Texas

Microstrip lines are the most commonly used transmission lines at high frequencies. In this paper, we will illustrate how to model the capacitance of microstrip lines using COMSOL Multiphysics. The goal is to determine the capacitance per unit length of shielded microstrip lines.

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 ...

Mathematical Frame-work for the Productivity Index of Wells with Fast Forchheimer (non-Darcy) Flow in Porous Media

E. Aulisa [1], A. Ibragimov[1], P. Valko [2], and J. Walton[3]
[1] Texas Tech University, Department of Mathematics and Statistics
[2] Texas A & M University, Department of Petroleum Engineering
[3] Texas A & M University, Department of Mathematics

In the current paper, similar features for fast or turbulent, non-linear flows subjected to Forchheimer equations are analyzed. Under some hydrodynamic and thermodynamic constrains, it has been shown that there exists the so called pseudo-steady state regime for Forchheimer flows in reservoir media. This invariant is called diffusive capacitance, which is the mathematical model for the well ...

Transport Phenomena in Nafion®-Polypropylene Composite Membranes

V.V. Narvekar, Q. Fan, and S. Warner
Dept. of Materials and Textiles, University of Massachusetts, Dartmouth

A computational model is used to describe the current density distribution and the water management in the Nafion® 117 and Nafion®1115/PP composite membranes. The effects of the change in the membrane water content and the back-diffused water on distribution of proton concentration is discussed.

Comparison of Two-Dimensional PEM Fuel Cell Modeling using COMSOL Multiphysics

Z. Shi, X. Wang, and Z. Zhang
Oakland University, Rochester, MI

Two different two-dimensional mathematical models of the one PEM fuel cell are modeled using COMSOL Multiphysics, each considering a different cross-section. The first Models considers the influence of fluid behavior in the channel, while the second considers the interdigitated flow pattern. Results, including the mass concentration, the polarization curve, potential distribution and velocity ...

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