Electroosmotic flow mixing in zigzag microchannels. Simulation of electro osmotic micro mixer in microelectro. The wet surface feature is used to implement the source term for the water vapor and to. This stepbystep instructional video will guide you through the modeling workflow, with an emphasis on structural mechanics modeling. Watch this 18minute archived webinar for an introduction to modeling fatigue with the comsol multiphysics software. Numerical study on low reynolds mixing of tshaped micro mixers. Numerical simulation of electrochemical processes using comsol multiphysics description sensors and biosensors, batteries and fuel cells, and electrochromic displays are examples of electrochemical devices that improve our lives almost every day. This model studies the dispersion of neutral species band through curved microchannel in an electroosmotic flow eof. With comsol, it is also possible to observe the effects of temperature on the capacitance value. We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services.
Passive micromixer can slightly improve the mixing, but the outcome is. Click below to register for this event we recommend that you bring your own laptop for this event and receive a free comsol trial license. Investigation of mixing and simulation of an electroosmotic micromixer. Slice plots of the velocity magnitude field inside the mixer. Modeling electroosmotic flow and the electrical double. This example describes an array of heating tubes submerged in a vessel with fluid flow entering at the bottom.
Learn how to use the microfluidics module to simulate microfluidic devices, including electrokinetic and electroosmotic flow. Comsol lep tutorial for tank flow system two cstr in series. Simulating electroosmotic flow with the microfluidics module. This paper sets to demonstrate a modeling of electrokinetic mixing employing electroosmotic stationary and timedependent microchannel using alternate zeta patches on the lower surface of the micromixer in a lab on chip microfluidic device. This chapter introduces you to the capabilities of the acdc module including an introduction to the modeling stages and some realistic and illustrative models. This example treats the modeling of electroosmotic flow in porous media. Femlab heat transfer tutorial rev rowan university. Pdf microfluidic mixing using periodically induced. The pressure and the velocity field are the solution of the navierstokes equations. The streamlines clearly reveal the twisting motion in the fluid that is induced by the mixer blades.
Secondly, when i am drawing a channel, how do i indicate the wall material to ensure the correct chemistry for generating the chargeselectric double layer for electroosmosis. Applied mathematical modelling xxx 2015 xxxxxx please cite this article in press as. More in depth and advanced topics included with this tutorial are used to show you. The purpose of this study is presenting an active micromixer, which is based on ac electroosmotic flow driven on 3d micro wires.
Capacitive sensor design using comsol provides the user with a wide variety of tools. This dissertation summarize a modeling of electrokinetic mixing employing electroosmotic stationary and timedependent micropumps via alternate zeta potential patches on the lower surface of the mixing chamber in lab on chip microfluidic device. The equations change based on the equation form selected. Improve microfluidic mixing no mixing electroosmotic mixing v 0 sinwt v 0 sinwt v 0 sinwt v 0 sinwt vel u 0 c 1. The combination of comsol products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. In electroosmosis the uncompensated ions in the charged. Activate your devices bluetooth function and set your device to search for bluetooth devices within range. Select comsol bt01r from the list of devices shown. At the microscale an active mixer using moving parts is very fragile. To access any comsol files, you need to have a comsol account which can be created for free. We also recommend you visit this page to find out about schedule changes and the latest information about the tutorial. This paper explores the performance of a microfluidic mixer that uses a sinusoidal electric field to accelerate the diffusion process between two newtonian liquid species in an electrolytic solution.
You can even use these entries as a starting point for your own models that are similar in nature. Here, i will describe the concept of electroosmosis and the electrical double layer edl, and how to model these in comsol. Build the presented model yourself by visiting our model gallery. Due to the application of electric field the mixing. The nnin at the university of michigan will be hosting a free workshop entitled comsol handson workshop on microfluidic devices. Open chapter and click on comsol tab present in the bottom of the page step 2. Submit a plot similar to figure 52 in the documentation. Agitation cfd simulation comsol multiphysics youtube. Combined electroosmosispressure driven flow and mixing in. This model demonstrates the mixing of fluids using laminarlayered flow in a mems mixer.
What is the best way to start with comsol multiphysics. This application presents an example of pressure driven flow and electrophoresis in a 3d micro channel system. The application gallery features comsol multiphysics. Introduction to comsol multiphysics 19982012 comsol. Watch this archived webinar to learn how to model electroosmotic flow, a useful skill for optimizing devices like micropumps and micromixers, with the comsol multiphysics software and addon microfluidics module.
An enhanced electroosmotic micromixer with an efficient. The purpose of the mixer application is to provide a userfriendly interface where scientists, process designers, and process engineers can investigate the influence that vessels, impellers, baffles, and operating conditions have on the mixing efficiency and the power that is required to drive the impellers. How to model structural mechanics in comsol multiphysics. Numerical simulation of electrochemical processes using. Theoretical investigation of electroosmotic flows and chaotic. Electroosmotic flow in porous media comsol multiphysics. Comsol isnt the best to deal with the turbulent phenomena required for mixing. Generator 2d simulation comsol multiphysics youtube. Modeling turbulent flow in a mixing tank introduction the purpose of this tutorial is to illustrate the setup and solution of a 3d turbulent. Bera, combined electroosmosispressure driven flow and mixing in a microchannel with. In this effort, a 2d model was developed using the comsol microfluidics module and involved both stationary and timedependent study steps. In order to solve governing equations of ac electroosmosis, a commercial software comsol multiphysics is implemented. The effect of microchannel width on mixing efficiency of microfluidic electroosmotic mixer conference paper pdf available october 2015 with 211 reads how we measure reads.
The effects that need to be taken into account are heat transfer, transport of water vapor, and fluid flow. Modeling of an acelectroosmosis based microfluidic mixer. Especially, the concentration of the dissolved substances in the uid was considered according to volt. In addition, we discuss topics such as how to treat the electrical double layer and turning a model into a userfriendly simulation app. The governing equations are numerically solved using the finite elementbased comsol multiphysics version 5. Energy harvester introduction screencast energy harvester comsol modeling. Microfluidic mixing using periodically induced secondary potential in electroosmotic flow article pdf available in journal of electrostatics 695.
Microfluidics module application gallery examples comsol. The central idea is to parametrically represent the geometry by bezier curves and these geometric parameters are further treated as optimization parameters in the. Here, i will describe the concept of electroosmosis and the electrical double layer edl, and how to model these in comsol, walking you through two example models. Design of an electroosmotic microfluidic mixer comsol. Comsol tutorial for es 176es 276 mems 11042015, 11. Microfluidic devices require pumps and mixers without moving parts. Important applications include simulations of labonachip devices, digital microfluidics, electrokinetic and magnetokinetic devices, and inkjets. Generator 2d simulation comsol multiphysics esteban mauricio padilla orjuela. Electroosmotic flows in microchannels with finite inertial and pressure forces j. This tutorial shows how to couple three physics interfaces to model evaporative cooling. Pdf numerical study of electroosmotic mixing and transport of non. Microlaboratories for biochemical applications often require rapid mixing of different fluid streams.
Comsol multiphysics simulations of microfluidic systems for biomedical applications maria dimaki, jacob moresco lange, patricia vazquez, pranjul shah, fridolin okkels and winnie edith svendsen dtu nanotech department of micro and nanotechnology, technical university of denmark, dk2800, kgs. You will learn about the basic theory of fatigue analysis as well as the various fatigue studies possible using comsol multiphysics. Simulation of highly nonlinear electrokinetics using a weak formulation gaurav soni, todd m. In this work, we proposed a novel design of a microfluidic mixer utilizing the amplified marangoni chaotic advection induced by alternating current ac continuous electrowetting of a metal droplet situated in electrolyte solution, due to the linear and quadratic voltagedependence of flow velocity at small or large voltages, respectively. The simulation images on this page are available for editors and journalists to use in appropriate articles. Numerical study on the mixing performance of a ringtype electroosmotic micromixer with different obstacle configurations article in journal of nanoscience and nanotechnology 126. Numerical study on the mixing performance of a ringtype. Model library guide the following table summarizes key information about the entries in this model. Right click on the solid mechanics node and select fixed constraint. This paper explores the performance of a microfluidic mixer that uses a sinusoidal. The 2d model was developed using the microfluidics module in the comsol multiphysics software and involved both stationary and time dependent. The second example, a micromixer, uses the electroosmotic velocity boundary.
Comsol simulation of an electroosmotic microfluidic mixer. Comsol is the developer of comsol multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems. Geometry 1 import 1 1 in the model builder window, rightclick model 1geometry 1 and choose import. Using optimization module, geometric optimization is carried out to minimize the curveinduced dispersion. Meinhart department of mechanical engineering university of california santa barbara, ca 93106, usa department of chemical engineering university of california santa barbara, ca 93106, usa. The 2d model was developed using the microfluidics module in the comsol multiphysics. The phrase image made using comsol multiphysics software and provided courtesy of comsol. The microfluidics module provides a specialized electroosmotic velocity. Electro osmotic micro mixer is a device used to mix different configuration of fluid streams. In this stepbystep instructional video, you will learn how to model rf and microwave heating in a waveguide bend containing a dielectric block with comsol multiphysics simulation software. Rather, than reading books on comsol, i suggest please start using comsol because when you will start, you will find many errors, may be physics. Pdf modeling of electrokinetic mixing in lab on chip. Particular functionality may be common to several products.
The equations that comsol solves are displayed in the equation section of the settings window. How to simulate particle tracing in a laminar static mixer duration. Modeling electroosmotic flow and the electrical double layer. The goal of this device is to show effective mixing scheme. Comsol multiphysics has wide range of functionalities. Microfluidic flows in biomems biomicroelectromechanical systems devices are typically laminar flows, hence their mixing is very difficult. The above system is solved numerically using the commercial. An investigation of mixing in a micromixer structure with a novel. Pdf numerical study on the mixing quality of an electroosmotic. Electroosmotic flows in microchannels with finite inertial. Comsol multiphysics simulations of microfluidic systems for. Comsol simulation of an electroosmotic microfluidic mixer shengming hui1, xingguo xiong 2, junling hu 3, prabir patra4 abstract. Investigation of mixing and simulation of an electroosmotic micromixer article in journal of mechanical science and technology 288. Oct 28, 20 microfluidic devices are so small that the micropumps and micromixers that control and mix the fluid inside the device cannot involve any moving components.
The microfluidics module brings you easilyoperated tools for studying microfluidic devices. Tutorial for running comsol files from comsol website step 1. Instead, they must take advantage of electroosmotic flow. Tutorial for running comsol files from comsol website. The distance travelled by the fluids depends upon the parameters of the molecules. Simulation of flow inside tube with solving heat transfer comsol simulation conduction in cylindrical wall convection in flowing flow solidfluid interaction temperature and velocity distribution.
The equations of motion are averaged over volumes which are small compared to the computational domain but large compared to the size of the dispersed particlesbubblesdroplets. This model analyzes the steadystate condition of the fluid flow as well as the convection and diffusion of a dissolved substance in a lamella mixer. The equations that are solved are the continuity equations for flow velocity and current density. One alternative is therefore to use electroosmotic effects to achieve a mixing effect that is perpendicular to the main direction of the flow. This is a multiphysics model because it involves fluid dynamics coupled with heat transfer. Numerical study on the mixing quality of an electroosmotic. Jul 24, 2018 i am working with comsol since last five years.
Following the steps given in the documentation of the comsol heat conduction in a slab tutorial see next page. Simulation of highly nonlinear electrokinetics using a weak. The effect of different charge patterns, zeta potential and external electric field is studied numerically using comsol multiphysics. Fem modeling for piezoelectric pzt5a energy harvester l10. Comsol multiphysics and its gui but would like to learn more about how to set up a certain model. Also, the mixing performance of the mixer with different obstacle con gurations in the mixing chamber was examined by numerical analysis using the commercial code, comsol.
Setting the fixed constraint at the four edges of the diaphragm. The cell combines pressure and electroosmotic driven flow. Learn how to model microfluidic devices in comsol, such as. The user can simulate a design, test for the capacitance and observe the effects on capacitance by changing parameters such as dielectric permittivity of materials. The electroosmotic actuated active micromixer was numerically studied. Uber comsol multiphysics modellierungsbeispiele zum. Semiconductor module updates for users of the semiconductor module, comsol multiphysics version 5. His research interests include integrated circuit design for ultrasound 3d imaging and therapeutic cmut arrays, design of analog, digital and mixedsignal integrated. Another way of improving mixing efficiency is to use active mixers with moving parts that actively stir the fluids. Comsol lep tutorial for tank flow system two cstr in series step 1. Mixing is a very crucial unit operation in process industry.
In this paper, we have design an electro osmotic micro mixer in micro scale using comsol multiphysics. Learn how to use comsol multiphysics and the structural mechanics module by conducting a static analysis of a mechanical structure. The ideal schottky, thermionic emission, and continuous quasifermi level boundary conditions have been enhanced to improve the. Aug 21, 2017 i was wondering how would one go about incorporating an electric field and the requisite chemistry to carry out an electroosmotic simulation in ansys aim or the workbench.
Theoretical investigation of electroosmotic flows and chaotic stirring in rectangular cavities. Electroosmotic flow is augmented using different model designs with alternate zeta potential values such as 25mv, 50mv and 100mv respectively to. The electroosmotic actuated active micromixer was numerically studied for various values of inlet velocity, phase lag, frequency, and voltage amplitude. The system consists of a compartment of sintered porous material and two electrodes that generate an electric field. In this study we performed numerical and experimental investigations into the mixing of eofs in zigzag microchannels with two different corner geometries, namely sharp corners and flat corners.
On the comsol youtube channel, you will learn something new in a variety of helpful and entertaining videos. At the microscale level, however, neither of these approaches is practical or even possible. This model example illustrates applications of this type that would nominally be built using the. No part of this manual may be photocopied or reproduced in any form without prior written consent from comsol ab.
Santiago department of mechanical engineering, stanford university, stanford, california 94305 emerging microfluidic systems have spurred an interest in the study of electrokinetic flow phenomena in complex geometries and a variety of flow conditions. This program models a basic secm configuration, using an ultramicroelectrode ume tip and a substrate with butlervolmer conditions for the electrochemistry of two redox pairs o1r1 at the tip and. Comsol simulation of the direct piezoelectric effect. This video demonstration describes a conventional workflow which can be used to solve a multiphase mixing problem on a mixing tank with two impellers. You can even use these entries as a starting point for your own. Optimizing band dispersion in an electroosmotic flow through.
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