Comsol lep tutorial for tank flow system two cstr in series step 1. On the modeling and simulation of electroosmotic micropump. Finally, dont forget that comsol is a multiphysics software, allowing you to couple the physics seen in this model to other physics. Comsol, the software package includes mems module and. Simulating electroosmotic flow with the microfluidics module. Modeling electroosmotic flow and the electrical double. 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. A 2d model is used for one pumping stage to examine the pumping pressure and flow rate of blood using electroosmotic micropump. 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. 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 will be done using comsol multiphysics software.
Electroosmotic flow how is electroosmotic flow abbreviated. A planar electroosmotic micropump using water as the working fluid. A computational model for simulation of electroosmotic. One application of this is removing liquid flooding water from channels and gas diffusion layers and direct hydration of the proton exchange membrane in the membrane electrode assembly mea of the proton exchange membrane fuel cells. In ce, the capillary columns consist of silica with silanol groups exposed on the inner surface. 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.
Abstract ac electroosmotic micropumps are suggested to be powerful tools for. Comsol, comsol multiphysics, comsol reac tion engineering lab, and. Feb 07, 20 fluid flow generated by a pair of coplanar electrodes energized with ac voltage. Electroosmotic flow through a microtube with sinusoidal. In our research group, we usually employ comsol multiphysics. Optimizing band dispersion in an electroosmotic flow through a curved microchannel. Looking for a video on how to use the comsol multiphysics software.
Comsol, comsol multiphysics, comsol script, comsol reaction engineering lab. This example treats the modeling of electroosmotic flow in porous media. Electroosmotic flow in porous media comsol multiphysics. Then appropriate materials are selected and a suitable microfluidics interface is added. Lowvoltage electroosmotic micropump micropumps, especially those based on. Instead, they must take advantage of electroosmotic flow. When comsol compiles the equations the complex couplings generated by these userdefined expressions are automatically included in the equation system. The equations for conservation of linear and angular momentums and gausss law of charge distribution are solved within the framework of the debyehuckel approximation. 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. The fluidfluid interfaces are tracked using a ternary phase field formulation that accounts for differences. Browse the application gallery and download tutorial models with instructions and view example apps. This model simulates the mechanism of a valveless micropump, that is designed to be effective at low reynolds numbers, overcoming hydrodynamic reversibility. Pdf numerical analysis of non newtonian fluid flow in a low.
Browse hundreds of videos in the comsol video gallery. The application gallery features comsol multiphysics tutorial and demo app files pertinent to the electrical, structural, acoustics, fluid, heat, and chemical disciplines. Inkjet design although initially invented to be used in printers, inkjets have been adopted for other application areas, such as within the life sciences and microelectronics. Electroosmotic micropump is one of the important microfluidic systems which can transport fluids through microchannels without mechanical moving parts. In addition, we discuss topics such as how to treat the electrical double layer and turning a model into a userfriendly simulation app. During the experiments, applying a multistage nanotube electroosmotic micropump with the same pore size at the two stages yielded a superior performance curve compared to that of the singlestage nanotube electroosmotic micropump. The characteristic analysis of electroosmotic micropump with.
Based on the navierstokes equations and the poissonnernstplanck pnp ion transport equations, the finite volume method is adopted to calculate the equations and boundary conditions of the induced charge electroosmotic flow. Comsol lep tutorial for tank flow system two cstr in series. Open chapter and click on comsol tab present in the bottom of the page step 2. The flow volume and pressure difference of the pump increased rapidly with the input voltage. The chapter focuses on pump channel materials, electrodes, and their. Wong, development of a micro pump for microelectronic cooling, int. Mohamed badran electroosmotic micropump for biomedical applications. A computational model for simulation of electroosmotic flow in microsystems g. The principle of electroosmotic flow is as follows. Excerpt from the proceedings of the comsol conference 2008 boston. Distributions of the oxygen flow, the liquid water, and the electric. You can use these examples as a starting point for your own. Electroosmotic flow eof pumps with flow rates on the order of 1 mlmin have been designed and fabricated.
Electroosmotic oscillatory flow of micropolar fluid in. The solid surface becomes charged and counterions coming from the bulk liquid shield this surface charge. Electroosmotic flow is the bulk liquid motion that results when an externally applied electric field interacts with the net surplus of charged ions in the diffuse part of an electrical double layer. Nov 24, 2015 pinned ion exchange resin 45m diameter and polystyrene particle7m. Silicon electroosmotic micropumps for integrated circuit. Simulating microfluidic devices in comsol multiphysics. Electroosmotic pumping is receiving increasing attention in recent years owing to the rapid development in micro total analytical systems. Electroosmotic flow through a microtube with sinusoidal roughness. The exposed silanol groups are ionized above ph 3, therefore creating a negatively charged inner capillary surface.
The first example is of a micropump that is resolved in the whole geometry, including the edl. The pumping chamber is filled with densely packed nonporous silica particles, and the particle bed is held in place using two polymeric porous frits. Numerical analysis shows that the velocity is proportional to the voltage and the joule heat is small and negligible. 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. Mathematical modeling of ac electroosmosis in microfluidic and. A low voltage 3d parallel electroosmotic flow eof pump composed of two electrode layers and a fluid layer is proposed in this work. Latticepoissonboltzmann simulations of electroosmotic flows. Velocity profile of electroosmotic flow in a sample circular capillary. At the microscale, flow is usually highly ordered laminar flow, and the lack of turbulence makes diffusion the primary mechanism for mixing.
Latticepoissonboltzmann simulations of electroosmotic. An electroosmotic pump eop, or eo pump, is used for generating flow or pressure by use of an electric field. Electroosmosis was discovered independently in 1814 by the english chemist robert porrett jr. Microlaboratories for biochemical applications often require rapid mixing of different fluid streams. Electroosmotic and ac electroosmotic pumps at the interface between solid walls and electrolytes, double layers are formed 1 due to differences in electrochemical potentials of both phases. On modeling and simulation of electroosmotic micropump for. In this chapter, we will introduce the research progress on eof pumps in the fields of microfluidic science and technology and briefly present their microfluidic applications in recent years. For example in the coplanar ac electroosmotic micro pumps, the. Get the micropump mechanism tutorial model shown in the demo. Compared with other micropumps, electroosmotic pumps eops offer a number of advantages such as creation of constant pulsefree flows and elimination of moving parts. Modeling electroosmotic flow and the electrical double layer.
Aiming at the coupling problems of electrical field and flow field in porous media microchannels, the mathematical model of electroosmotic eo flow is built. The microfluidic chip, based on polydimethyl siloxane pdms and polyethylenenaphtalate pen, is cost effective, flexible and totally biocompatible. Fluorescent latex particles are used to visualize the flow pattern. Simulation and experimental study of a porous electroosmotic. This model studies the dispersion of neutral species band through curved microchannel in an electroosmotic flow eof. The term electroosmotic flow and electroosmosis are generally used interchangeably in the context of micro and nanofluidics. Electroosmotic flow is caused by the coulomb force induced by an electric field on net mobile electric charge in a solution. Optimizing band dispersion in an electroosmotic flow. J microelectromech syst article pdf available in journal of microelectromechanical systems 116. Modeling using the graphical user interface3d example. Micropumps are key components of microfluidic systems with applications ranging from biological fluid handling to microelectronic cooling. The comsol sales and support teams are available for answering any questions you may have regarding this.
This phenomenon is also known as separated flow with surface tracking. Similar systems incorporating arrays of feedbackcontrolled silicon electroosmotic micropumps could provide ondemand forced convective cooling of spatially and temporallyvarying hot spots. Electroosmotic flows in microchannels with finite inertial and pressure forces j. For a single microchannel, the influence of voltage on velocity and joule heat is analyzed by using coventorware. The electroosmotic flow of a micropolar fluid in a microchannel bounded by two parallel porous plates undergoing periodic vibration is studied. Electroosmosis and thermal effects in magnetohydrodynamic mhd micropumps using 3d mhd equations article pdf available in sensors and actuators b chemical 1221. This paper presents the electroosmotic flow eof in a microtube with slightly corrugated wall. Aiming at the coupling problems of electrical field and flow field in porous media microchannels, the mathematical model of electroosmoticeo flow is built.
Pdf lowvoltage electroosmotic micropump solved with. The new threephase flow, phase field interface can be used to model the flow and interaction of three different, immiscible fluids when you need to study the exact positions of the interfaces separating the fluids. The recorded presentation includes a demonstration that shows you how to set up and model a micropump with fully coupled fluidstructure interaction fsi. A planar electroosmotic micropump microelectromechanical. Electroosmotic flows in microchannels with finite inertial. Electroosmotic flow eof pumping has been widely used to manipulate fluids such as liquid sample reagents in microfluidic systems. Electroosmotic flow velocity measurements in a square. A computational model for simulation of electroosmotic flow. The cell combines pressure and electroosmotic driven flow. Optimizing band dispersion in an electroosmotic flow through. Thermal bilayer valve 3 thermal bilayer valve a common actuation method in mems is to utilize deformations caused by differential thermal expansion in layered materials. These pumps use eof to propel liquid solutions in a compact system with no moving parts.
Pdf the growing interest of researchers in the phenomenon of electrokinetic can be seen as a direct and natural response to the. In the area of electronics cooling, micropumping needs are. Electroosmotic flow pumps with polymer frits sciencedirect. Modeling and simulation of a costeffective microfluidic. The fluid layer contains twenty parallel fluid channels and is set at the middle of the two electrode layers. Comsol multiphysics is employed to investigate serpentine flow channels of a small proton exchange membrane fuel cell with power 0. Lowvoltage electroosmotic micropump solved with comsol multiphysics 3. Oct 28, 20 you can get a general overview of comsols microfluidics modeling capabilities here, or contact us for more indepth information on how you can use comsol multiphysics to model a variety of applications.
Santiago abstract electroosmotic eo micropumps use fieldinduced ion drag to drive liquids and achieve high pressures in a compact design with no moving parts. Electroosmotic pumps and their applications in microfluidic. Design and numerical study of micropump based on induced electroosmotic flow. Pdf study the electroosmosis flow in microchannel with. In this paper, modeling and simulation of electroosmotic micropump using nonnewtonian fluid like blood will be conducted to investigate its performance. The central idea is to parametrically represent the geometry by bezier curves and these geometric parameters are further treated as optimization parameters in the. Fluid flow generated by a pair of coplanar electrodes energized with ac voltage. The characteristic analysis of electroosmotic micropump with multistage nanotubes. You can also open a pdf documentation which details the reactor model and a stepbystepprocedure to create this comsol module from scratch. Simulation of highly nonlinear electrokinetics using a. One was a 40mmlong borosilicate glass channel with a square cross section of height 200. Feb 01, 2009 electroosmotic pumping is receiving increasing attention in recent years owing to the rapid development in micro total analytical systems. Multiphysical modeling of dc and ac electroosmosis. Get the micropump mechanism tutorial model shown in the.
A circular ac electroosmotic micropump for chromatographic applications. Using optimization module, geometric optimization is carried out to minimize the curveinduced dispersion. The characteristic analysis of electroosmotic micropump. The system consists of a compartment of sintered porous material and two electrodes that generate an electric field. Induced charge electroosmotic flow is a new electric driving mode. Latticepoissonboltzmann simulations of electroosmotic flows in charged anisotropic porous media moran wang1,2. In this paper, the formula of the induced zeta potential of the polarized solid surface is.
The distance between fluid and electrode channels was controlled to be under 45. 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. The comsol multiphysics software requires discretization of spatial. Secondly, when i am drawing a channel, how do i indicate the wall. 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.
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