The effects that need to be taken into account are heat transfer, transport of water vapor, and fluid flow. Comsol is the developer of comsol multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems. Introduction to comsol multiphysics 19982012 comsol protected by u. Under input section on the left hand side, you can view and change any parameter values. Andrew demello department of biomedical engineering. Comsol environment facilitates further analysis by making whatif cases easy to. Setting the fixed constraint at the four edges of the diaphragm. Intro to modeling heat transfer with comsol multiphysics. Computational fluid dynamics modeling of twodimensional and threedimensional segmented flow in microfluidic chips by katrina j. We discuss methods that involve simple approximations, highfidelity nonisothermal flow coupling, modeling heat transfer at fluidsolid interfaces, boundary approximations using heat transfer coefficients, techniques to fully resolve the flow and temperature fields, and more.
Because electroosmotic velocities are independent of conduit size, as long as the. World leader in multiphysics simulations hq in stockholm. In addition, we discuss topics such as how to treat the electrical double layer and turning a model into a userfriendly simulation app. Singlephase flow creeping flowstokes flow laminar flow newtonian and nonnewtonian flow turbulent flow algebraic yplus model lvel model k. After you are done, click on compute button present above the input. Electroosmosis, comsol multiphysics, electrokinetic flow, ionic fluid, comsol. The equations that comsol solves are displayed in the equation section of the settings window.
Semiconductor module updates for users of the semiconductor module, comsol multiphysics version 5. Use of comsol simulation for undergraduate fluid dynamics course dr. Pdf study the electroosmosis flow in microchannel with. Use of comsol simulation for undergraduate fluid dynamics. As alternative we can use the already constructed geometry by applying the steps from part b.
Dynamic electroosmotic flows of powerlaw fluids in. 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. The best source for comsol is absolutely its documentations and the comsol website. This example describes an array of heating tubes submerged in a vessel with fluid flow entering at the bottom. The microfluidics module provides a specialized electroosmotic velocity boundary condition as one of several fluid wall boundary conditions. The application gallery features comsol multiphysics.
Comsol quasistatic electromagnetic acdc module domain and mesh generation. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Donovan approved for the department of chemistry san jose state university may 2014 dr. Introduction 5 introduction the acdc module is used by engineers and scientists to understand, predict, and design electric and magnetic fields in statics and lowfrequency applications. Warning your internet explorer is in compatibility mode and may not be displaying the website correctly. The chemical engineers practical guide to fluid mechanics. 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. Broers building 21 j j thomson avenue cambridge cb3 0fa. Capacitive sensor design using comsol provides the user with a wide variety of tools. Microfluidics software for simulating microfluidics devices. To compute how much heat energy has been transferred from radiator. Electrostatic potential between cylinders 55 3 in the list of application modes, open the comsol multiphysics folder and then the electromagnetics folder.
Pdf the growing interest of researchers in the phenomenon of electrokinetic can be. How to model structural mechanics in comsol multiphysics. Dynamic characteristics of electroosmosis of a typical nonnewtonian liquid in a rectangular microchannel are investigated by using numerical simulations. 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. It also provides a quick introduction to creating applications using the application builder. Andrew demello department of biomedical engineering, eth, zurich, switzerland. Computational fluid dynamics modeling of twodimensional. Modeling electroosmotic flow and the electrical double layer. If this length is much smaller than your geometrical length scale, use the electroosmotic velocity boundary condition. Numerical modeling and analysis of electro osmotic. If you do not yet have a comsol access account, please create one now. The wet surface feature is used to implement the source term for the water vapor and to. Oct 28, 20 comsol includes an electroosmotic velocity boundary condition that ignores the flow field between the wall and the slipping plane, and analytically computes the velocity at the wall based on the zeta potential using the helmholtzsmoluchowski relation.
Comsol multiphysics has wide range of functionalities. The system consists of a compartment of sintered porous material and two electrodes. Femlab heat transfer tutorial rev rowan university. The model uses the predefined electroosmotic flow multiphysics coupling. Effects of electroosmotic flow on ionic current rectification in conical nanopores article in the journal of physical chemistry c 1149. This stepbystep instructional video will guide you through the modeling workflow, with an emphasis on structural mechanics modeling. Uh innovation centre college lane hatfield hertfordshire al10. Comsol tutorial heat conduction in a simple heat sink aluminium cooling a high voltage copper cable. 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 numerical simulation of electroosmotic flow with. The system consists of a compartment of sintered porous material and two electrodes that generate an electric field.
This model example illustrates applications of this type that would nominally be built using the. It also describes application modes available in the core femlab package and much more. In his keynote talk at the comsol conference 2018 lausanne, andri bezzola of. Pdf lowvoltage electroosmotic micropump solved with. 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. Modeling electroosmotic flow and the electrical double. 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. This manual demonstrates the basics of how to create a model, how to use the graphical user interface and how to specify a geometry. Electrophoretic and dielectrophoretic forces on charged or polarized particles in the fluid can be used to induce particle motion, as can diamagnetic forces in the case of magnetophoresis. This example treats the modeling of electroosmotic flow in porous media.
Electroosmotic flows in microchannels with finite inertial. Right click on the solid mechanics node and select fixed constraint. To simulate the heat transfer processes between room and a radiator by using comsol multiphysics software. Particular functionality may be common to several products. The model consists of laplace and poissonboltzmann equations dictating external electric potential, and total electric potential, respectively. The cell combines pressure and electroosmotic driven flow.
The nonnewtonian behavior of liquids is assumed to obey the famous powerlaw model and then the mathematical model is solved numerically by using the finite element method. Introduction to comsol multiphysics 19982012 comsol. Trial licenses are automatically associated with your account. Motion of uncharged particles in electroosmotic flow. Comsol lep tutorial for tank flow system two cstr in series. 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. Click on tank volume tab to view the volume of each tank with time step 7. You will need an onsubscription comsol license attached to your comsol access account or a software trial provided by your sales representative.
Electroosmotic flow of powerlaw fluids in a slit channel1d is analyzed. Introduction 7 the transmission and reflection of the device is obtained in the form of sparameters, as in figure 2. 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. Comsol, comsol multiphysics, comsol reac tion engineering lab, and. Tutorial for running comsol files from comsol website. To access any comsol files, you need to have a comsol account which can be created for free. Therefore, we recommend that you first calculate the debye length, i. Model single and twophase creeping flow, electrophoretic, electrokinetic. It provides an overview of the comsol environment with examples that show you how to use the comsol desktop user interface and the model builder.
Laplacepoissonboltzmann navierstokes has been developed. Submit a plot similar to figure 52 in the documentation. Effects of electroosmotic flow on ionic current rectification. You dont need any previous knowledge about this program and will get to know the basics in order to perform your own simple simulation and analyse the obtained data. Simulating electroosmotic flow with the microfluidics module. For example for the velocity field u i am not sure what to enter. Watch this archived webinar to learn how to simulate heat transfer in fluids using the comsol multiphysics software. Electroosmotic flows in microchannels with finite inertial and pressure forces j. To help the learning process, there is a streamlined. Electroosmotic flow in porous media comsol multiphysics. Comsol, commercially available multiphysics software, with its specific mems and. To solve three heat transfer problems with theoretical method and comsol model method 4.
We discuss methods that involve simple approximations, highfidelity nonisothermal flow coupling, modeling heat transfer at fluidsolid interfaces, boundary approximations using heat transfer coefficients, techniques to fully resolve the flow and. Uber comsol multiphysics modellierungsbeispiele zum. More in depth and advanced topics included with this tutorial are used to show you. In the present paper, an electroosmotic flow model is described. Direct solver conjugate gradient solver cgs gmres solver fgmres solver bicgstab geometric multigrid gmg an example of gmg solver. Comsol includes an electroosmotic velocity boundary condition that ignores the flow field between the wall and the slipping plane, and analytically computes the velocity at the wall based on the zeta potential using the helmholtzsmoluchowski relation. Click on comsol access present at the bottom of the page. Now includes comsol multiphysics 5 since most chemical processing applications are conducted either partially or totally in the fluid phase, chemical engineers selection from fluid mechanics for chemical engineers. Energy inputs and outputs are also easier to control for example, heat generated.
Learn how to use comsol multiphysics simulation software at a guided training course or webinar. The governing equations are the poissonboltzmann equation, the cauchy momentum equation, generalized smoluchowski equation and the continuity equation are used to get shear stress, dynamic viscosity, and velocity distribution. Change the inlet concentration in tank 1 from molm3 to 1500 molm3. The equations change based on the equation form selected. The pressure and the velocity field are the solution of the navierstokes equations. Computational fluid dynamics modeling of twodimensional and.
Uh innovation centre college lane hatfield hertfordshire al10 9ab. We calculate the heat conduction in a simple heat sink aluminium cooling a high voltage copper cable. If not, use the traditional noslip velocity wall boundary condition and. Select electrostatics from the list of electromagnetics application modes.
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. In this tutorial, we will solve one physical problem using a numerical toolbox called comsol multiphysics femlab. Jan 14, 2015 the best source for comsol is absolutely its documentations and the comsol website. Analysis of electroosmotic flow of powerlaw fluids in a.
This will open up comsol library where you see many comsol files to solve chemical reaction engineering problems. Electroosmotic flow or electro osmotic flow, often abbreviated eof. This tutorial shows how to couple three physics interfaces to model evaporative cooling. With comsol, it is also possible to observe the effects of temperature on the capacitance value. The equations that are solved are the continuity equations for flow velocity and current density.
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. The ideal schottky, thermionic emission, and continuous quasifermi level boundary conditions have been enhanced to improve the accuracy of your. What are good sources of tutorials to learn comsol. More in depth and advanced topics included with this tutorial are used to show you some of the many options available in comsol. Pdf numerical simulation of electroosmotic flow with step. You dont need any previous knowledge about this program and will get to know the basics in order to perform your own. Because electroosmotic velocities are independent of conduit size, as long. This model takes advantage of electroosmosis to mix fluids. In part a of the tutorial we construct the geometry of the problem to be solved. Following the steps given in the documentation of the comsol heat conduction in a slab tutorial see next page.
Learn how to use comsol multiphysics and the structural mechanics module by conducting a static analysis of a mechanical structure. And do not forget about right click, you could do every modeling and simulation just with right click. Does any body knows how to simulate electrical double layer edl. Lets change a parameter and see the effect on the profile. The sparameters, on a db scale, as a function of the frequency. They are followed by a description of our original comsol model designed to simulate a small puck magnet falling through a long copper tube. Simulation of highly nonlinear electrokinetics using a.
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