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Mian Qin COMSOL Inc. April 20th, 2011

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Mian Qin COMSOL Inc. April 20th, 2011

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    2. Micro Electro Mechanical Systems

    3. COMSOL Multiphysics

    4. COMSOL Multiphysics 4.1 Product Suite

    5. World leader in multiphysics simulations

    6. MEMS Application Fields

    7. Microfluidics Behavior, control and manipulation of fluids at the microscale Design of systems in which such small volumes of fluids will be used Some important phenomena to consider in microfluidics systems: Small size Small volume Shorter time scale Low energy input Large surface to volume ratio Laminar flow, high fluidic resistance Electrokinetic phenomena Hydrophobic vs. hydrophilic surface Intrinsic surface roughness Adsorption of species on wall: induced roughness Viscosity change? Is viscosity at the wall different at bulk. Continuum?

    8. General Transport Abilities of COMSOL General Laminar Flows: Stokes flow (inertial irrelevant) Incompressible flow Weakly compressible flow ( adding slight compressibility effect) Porous media flow Electrokinetic flow Electroosmosis Electrophoresis AC Electroosmosis Dielectrophoresis Electrothermal Multiphase Flow Moving mesh Multiphase Navier-Stokes equation Interface tracking: level set/phase field methods Heat Transfer: Convection, conduction and radiation Non-isothermal flow Joule heating Natural/forced convection Species/Mass Transport: Convection, diffusion and migration Reaction Dilute or concentrated solution Multi-species transport Unlimited Multiphysics Flow and Species Transport Flow and Heat Transfer Fluid-structure interaction Fluid with surface reaction And beyond �

    9. Capabilities in Microfluidic Modeling Pressure driven flow (Re #): laminar flow or creeping flow, slip/no slip wall, moving and leaking wall Species transport with reaction (Pe #): dispersion, mixing and separation, filtration, surface reaction, chaotic advection Heat transfer and buoyancy (Gr #, Ra #): gravity, density-driven flow, phase change, evaporation, condensation Interface tension and multiphase flow (Ca #, We #): free surface deformation, jet and droplet, drop dynamics, moving contact

    10. Fluid slip (Ku #): Viscous and thermal creep on walls Electrokinetic effects: electroosmosis, electromigration, electrophoresis, AC electrokinetics, dielectrophoresis, electrothermal effect Fluid structure interaction: fluid driven by deforming structure, structure sensing the fluid motion, fully coupled, ALE deformed mesh Magnetics field/Lorenz force driven flow: magneto-hydrodynamics Rotating or moving objects: rotating mixer, micro-mixer with moving parts Capabilities in Microfluidic Modeling

    11. Inkjet printing Key Feature: Interface tracked exactly; Interface normal, curvature and physical quantites can be computed Good mass conservation with reinitialization Mapped mesh Multiphysics coupling: electrostatics, heat transfer�

    12. Electroosmotic Pump

    13. ?-Mixer: enhance mixing Key features: Import the geometry from industry-standard CAD Moving mesh, rotating frame Concentrated or diluted species convection and diffusion Mixing index calculation Nonlinear effects and more physics can be added: thermal, chemical, electric or magnetic field �

    14. Transport in an Electrokinetic Valve Key Features: Flow field: momentum balance (Stokes or Navier-Stokes) Electric field: current balance Mass transport: diluted species, Nernst-Planck Fully integrated Solved the model in sequence according to the actual device Yon can specify: charge number, mobility, diffusivity (isotropic or anisotropic), nonlinear material properties

    15. Capillary Filling: capillary driven microflow Key Features: Capillary driven two phase flow Surface tension and wall adhesive forces Built-in moving contact: interface moving along the wall, hydrophobic or hydrophilic Specify friction using wall slip length and contact angle wettability gradients: thermal gradient (built-in), electrowetting, optowetting Ready to couple with other physics

    16. Fluid Structure Interaction Key Features: Fully and strongly coupled fluid structure interaction ALE moving mesh Weak constraints: accurate fluid load computation Small and large deformation Quick model building with predefined application mode using groups No manual interfacing between different solvers Segregated solver for stationary and parametric analysis of large 3D models

    17. Electrophoresis example

    18. Microfluidics: Related Areas In addition, COMSOL can and has been used for: Ferrofluidics MagnetoHydroDynamics (MHD) ElectroHydroDynamics (EHD) Dielectrophoresis (DEP) Thermophoresis Piezo+fluid couplings

    19. COMSOL Multiphysics 4.2 Product Suite

    20. Upcoming Microfluidics Module A new dedicated Microfluidics Module is to be released in May 2011 with Version 4.2 Important features: Electrokinetic flow Creeping flow Two-phase flow with level set and phase field Wetted walls Surface tension effects Fluid-Structure Interaction (together with MEMS Module or Structural Mechanics Module) News in Version 4.2: Two-phase flow with the ALE method (moving mesh) including new features for phase change Molecular Flow Mean-free path is long compared to geometry Vacuum systems, rarified gas flow Note: The MEMS Module previously included some Microfluidics capabilities. The new Microfluidics Module offers more dedicated and sophisticated tools for microfluidics simulations.

    21. New in Version 4.2: Two-Phase Flow with Moving Mesh Surface Tracking Laminar Two-Phase Flow with Moving Mesh physics interface Arbitrary Lagrangian-Eulerian method to track the free surface interface More accurate representation of surface tension and curvature effects for important problem types Evaporation or condensation effects on the free surface Mass Transport for one phase only or both phases Mass Transport across free surface

    22. New in Version 4.2: Molecular Flow Molecular Flow physics interface for rarified gas flow where continuum assumption no longer holds: Kn>>1 Needed when the mean free path of the molecules is long relative to geometry size Applications include vacuum systems and micro-scale gas flow

    25. Contact and Web Info www.comsol.com Product Info News User Community Forum Models Support: support@comsol.com Phone: 781-273-3322 (BOSTON, MA)

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