The simulation is done with femlabcomsol multiphysics package. Click on run in browser to start the application you will see that following window opens which has input parameters, description, graphical features and a few buttons. For each of these, the capabilities of the microfluidics module include surface tension forces, capillary forces, and marangoni effects. Introduction the ac dc module model library describes the ac dc interfaces and the available features using tutorial and benchmark examples for the different formulations. Smallsignal analysis is also available for other lumped parameters such as capacitance and impedance. Rf coils are important in numerous applications ranging from wireless technology to mri scanning equipment. The equations that comsol solves are displayed in the equation section of the settings window. Under input section on the left hand side, you can view and change any parameter values. Most previous researches on this subject focused on inducedcharge electroosmosis iceo vortex streaming actuated on ideally polarizable surfaces immersed in electrolyte solutions. The basic concept of iceo is to drive fluid flow near metal surfaces using weak ac electric fields. Comsol multiphysics true multiphysics everything can link to everything flexible you can model just about anything. Simulating electroosmotic flow with the microfluidics module. A lot of practical applications have been developed which utilize electroosmotic phenomena for microscale fluid manipulation. Pdf combination of ac electroosmosis and dielectrophoresis.
Modeling of an acelectroosmosis based microfluidic mixer. After you are done, click on compute button present above the input. Singlephase flow creeping flowstokes flow laminar flow newtonian and nonnewtonian flow turbulent flow algebraic yplus model lvel model k. Simulation of highly nonlinear electrokinetics using a. For the bulk surface species, the following equation is solved for the deposition height. Introduction the acdc module model library describes the acdc interfaces and the available features using tutorial and benchmark examples for the different formulations. For example, ac electroosmosis aceo 15 has been used as a method of concentrating dna in a microconcentrator 6, 7. Poisson equation based modeling of dc and ac electroosmosis. Click on tank volume tab to view the volume of each tank with time step 7. Numerical simulation of the electrical double layer based on the.
Numerical simulation of the electrical double layer based on the poissonboltzmann models for ac electroosmosis flows pascale pham 1, matthieu howorth, anne planatchretien and sedat tardu2. The library contains models for industrial equipment and devices, tutorial models, and benchmark models for verification and validation of the acdc interfaces. For example in the coplanar ac electroosmotic micro pumps, the. A third book, the acdc module reference guide, contains reference material about application mode implementations and commandline programming.
In addition, we discuss topics such as how to treat the electrical double layer and turning a model into a userfriendly. Feb, 2016 part 1 of an elementary tutorial for comsol multiphysics ver. Setting the fixed constraint at the four edges of the diaphragm. This introductory tutorial model demonstrates how to find the fundamental resonance frequency of an rf coil as well as how to perform a frequency sweep to extract the coils qfactor. A highthroughput electrokinetic micromixer via ac field. The cell combines pressure and electroosmotic driven flow. Following the steps given in the documentation of the comsol heat conduction in a slab tutorial see next page.
Part 1 of an elementary tutorial for comsol multiphysics ver. Microfluidics software for simulating microfluidics devices. Overview classical electrokinetic phenomena, such as electroosmotic flow and electrophoresis, are linear in the applied voltage and thus cannot produce any net flow under alternating current. Right click on the solid mechanics node and select fixed constraint. Comsol webinar modeling coils and electric devices youtube. Comsol multiphysics has wide range of functionalities. The comsol multiphysics package allows you to model almost all physical processes that are described by partial differential equations. Instead, they must take advantage of electroosmotic flow. Based on comsols automated machinery for linearizing biased components modal analysis or frequency sweeps. Comsol multiphysics and the acoustics module the acoustics module, an addon product to the comsol multiphysics software, is ideally suited for modeling the many.
Learn how to use comsol multiphysics and the structural mechanics module by conducting a static analysis of a mechanical structure. Particle motion manipulated via the combined wave structure and ide array is governed by ac electroosmosis aceo, dielectrophoresis dep or a combination of. An excellent method of moving fluid through these devices is induced charge electroosmosis iceo, whose theory was developed by bazant and squires and experimentally realized in the thorsen group. View screenshot workflow for modeling microfluidic devices. In part a of the tutorial we construct the geometry of the problem to be solved. Comsol multiphysics version 4 brings an unprecedented level of clarity to your simulation work by giving you both an organized model overview and a streamlined modelbuilding process.
A program for finiteelement calculations of complex scientific and technical problems. If you click on no flux 1 you can find the equation that is applied under equation and the boundary on which this equation is applied. Broers building 21 j j thomson avenue cambridge cb3 0fa. The acdc module features smallsignal analysis with automated differential inductance computations. Ac electroosmosis has also been shown as a mechanism for micro pumping by introducing asymmetry in the electrode design 8.
Here, i will describe the concept of electroosmosis and the electrical double layer edl, and how to model these in comsol. Numerical simulation of the electrical double layer based. Parameter sweeps and target functions can be executed right in the user interface. The comsol multiphysics software requires discretization of spatial. As sample volumes decrease, integrated control systems become critical for manipulation of liquid volumes on the pico to nanoliter scale.
Sphere 1 sph1 1 in the model builder, rightclick geometry 1 and choose sphere. Femlab heat transfer tutorial rev rowan university. The system consists of a compartment of sintered porous material and two electrodes that generate an electric field. Gaurav soni, marin sigurdson, and carl meinhart, uc, santa barbara. Modeling electroosmotic flow and the electrical double layer.
What is the best way to start with comsol multiphysics. Lets change a parameter and see the effect on the profile. The module is a powerful tool for detailed analysis of. The ultimate goal of most cvd models is to determine the total growth height and growth rate on the surface of the wafer. Comsol environment facilitates further analysis by making whatif cases easy to set up and run. Ac electroosmosis aceo is a nonlinear electrokinetic phenomenon of inducedcharge electroosmotic flow around electrodes applying an alternating voltage. Uh innovation centre college lane hatfield hertfordshire al10 9ab. Learn how to simulate electroosmotic flow using the microfluidics module, an add on to comsol multiphysics. You can take your simulation to the production level by optimizing any aspect of your model. To view the mass transfer boundary conditions, expand the transport of diluted species and view the various tabs which include boundary conditions and initial values.
Several technologies have been developed for microfluidic metering, mixing, and compartmentalization. The equations change based on the equation form selected. Click on comsol access present at the bottom of the page. This research investigates ac electroosmosis for manipulating. 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. Change the inlet concentration in tank 1 from molm3 to 1500 molm3. In this study, we make use of the ac fieldeffect flow control on inducedcharge electroosmosis iceo, to develop an electrokinetic micromixer with 3d electrode layouts, greatly enhancing the device performance compared to its 2d counterpart of coplanar metal strips.
This tutorial addresses the fluid mechanics problem of determining the entrance length for fully. Microfluidic devices are so small that the micropumps and micromixers that control and mix the fluid inside the device cannot involve any moving components. Mathematical modeling of ac electroosmosis in microfluidic and. Introduction to comsol multiphysics 19982012 comsol protected by u. A biased ac voltage wave applied to the central gate terminal, i. In his keynote talk at the comsol conference 2018 lausanne, andri bezzola of. The library contains models for industrial equipment and devices, tutorial models, and benchmark models for verification and validation of the ac dc interfaces. Multiphysical modeling of dc and ac electroosmosis. 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. Particle motion manipulated via the combined wave structure and ide array is governed by ac electroosmosis aceo, dielectrophoresis dep or a combination of both depending on the applied frequency. Tutorial for running comsol files from comsol website. The model uses the heat transfer in solids interface in combination with the electric currents in layered shells interface and the solid mechanics and membrane interfaces.
How to model structural mechanics in comsol multiphysics. Comsol, comsol desktop, comsol multiphysics, and livelink are registered trademarks or trademarks of comsol ab. It is available in html and pdf format from the comsol help desk. Simulation of highly nonlinear electrokinetics using a weak. The microfluidics module also provides dedicated methods for simulation of twophase flow with the level set, phase field, and moving mesh methods. You can take your simulation to the production level by optimizing. Comsol environment facilitates further analysis by making whatif cases easy to. Inducedcharge electroosmosis has attracted lots of attention from the microfluidic community over the past decade. Acdc module users guide 19982012 comsol protected by u. Submit a plot similar to figure 52 in the documentation. This will open up comsol library where you see many comsol files to solve chemical reaction engineering problems.
Learn how to model microfluidic devices in comsol, such as. Model navigator 1 begin a new comsol multiphysics session by invoking the model navigator. Ac electroosmosis has also been shown as a mechanism for micro pumping by introducing asymmetry in the electrode design 815. Despite the explosive growth of multiscale with comsol multiphysics, in the. The acdc module provides a unique environment for simulation of acdc electromagnetics in 2d and 3d. To help the learning process, there is a streamlined. 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 second example, a micromixer, uses the electroosmotic velocity boundary. Poissonboltzmann models for ac electroosmosis flows. In order to solve governing equations of ac electroosmosis, a commercial software comsol multiphysics is implemented.
Adds a comsolspecific toolbar to the excel ribbon for displaying geometry and mesh as well as running a simulation visualize comsol multiphysics results in excel. Starting from this point, we conduct herein a linear asymptotic analysis on nonlinear. Iiii complex 3d geometry construction using basic mathematics l7 duration. Electroosmotic flow in porous media comsol multiphysics. With comsol, it is also possible to observe the effects of temperature on the capacitance value. In our research group, we usually employ comsol multiphysics. Plot of the total mass lost in the domain blue and the total mass gained due to silicon deposition on the wafer surface green. Particular functionality may be common to several products. Pdf numerical simulation of the electrical double layer based on. How to set up and run a simulation with comsol multiphysics a proper introduction on how to set up and run a model in comsol multiphysics is essential when learning how to use the software.
Coil without skin effect begin this study of induced currents by modeling a currentcarrying coil without skin effect. As alternative we can use the already constructed geometry by applying the steps from part b. More in depth and advanced topics included with this tutorial are used to show you some of the many options available in comsol. For example, micro channel needs high pressure for pressure driven flow to produce. Tutorial model of a heating circuit comsol multiphysics. Comsol lep tutorial for tank flow system two cstr in series. The ac dc module physics interfaces are fully multiphysics enabled, which means you can couple any simulation in this module to an arbitrary simulation defined in any of the comsol multiphysics interfaces. In addition, we discuss topics such as how to treat the electrical double layer and turning a model into a userfriendly simulation app.
This multiphysics example simulates the electrical heat generation, heat transfer, and mechanical stresses and deformations of a heating circuit device. Capacitive sensor design using comsol provides the user with a wide variety of tools. 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. Velocity profile of electroosmotic flow in a sample circular capillary. The comsol user interface reduces clutter and redundant tasks, so your attention can be focused on the substance of your design studies. 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. Simulating a permanent magnet in solidworks with ems by emworks. The ac electroosmosis is mostly based on the coulombic interaction between an. For more information on how to work with the comsol multiphysics. This example treats the modeling of electroosmotic flow in porous media.
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