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The Model Gallery features COMSOL Multiphysics model files from a wide variety of application areas including the electrical, mechanical, fluid, and chemical disciplines. You can download ready-to-use models and step-by-step instructions for building the model, and use these as a starting point for your own modeling work. Use the Quick Search to find models relevant to your area of expertise, and login or create a COMSOL Access account that is associated with a valid COMSOL license to download the model files.

Droplet Breakup in a T-junction

Emulsions consist of small liquid droplets immersed in an immiscible liquid and widely occur in the production of food, cosmetics, fine chemicals, and pharmaceutical products. The quality of the product is typically dependent on the size of the droplets. Simulating these processes can help in optimizing these droplets as well as other process variables. This model studies the volume mass ...

Inkjet Nozzle: Level Set

Inkjet printers are attractive tools for printing text and images because they combine low cost and high resolution with acceptable speed. Designers can vary several parameters to modify a printer’s performance. Simulations can be useful to improve the understanding of the fluid flow and to predict the optimal design of an inkjet for a specific application. Although initially invented to ...

Filling of a Capillary Channel: Level Set and Phase Field Models

This example studies a narrow vertical cylinder placed on top of a reservoir filled with water. Because of wall adhesion and surface tension at the air/water interface, water rises through the channel. Surface tension and wall adhesive forces are often used to transport fluid through microchannels in MEMS devices or to measure, transport and position small amounts of fluid using micropipettes. ...

Red Blood Cell Separation using Magnetophoresis

Particle Tracing is used in conjunction with magnetic fields and pressure-driven microfluidic flow to calculate the separation of red blood cells from blood plasma using magnetophoresis. An array of soft iron rectangles on either side of a microfluidics channel modifies the magnetic field induced by a pair of neodymium permanent magnets. The resulting strong gradients in the magnetic field ...

Solute Band Dispersion in Curved Microchannel

This model studies the dispersion of neutral species band through curved microchannel in an Electroosmotic flow (EOF) . Using Optimization module, geometric optimization is carried out to minimize the curve-induced dispersion.The central idea is to parametrically represent the geometry by Bézier curves and these geometric parameters are further treated as optimization parameters in the ...

Jet Instability - Moving Mesh and Level Set Models

The Marangoni effect results in a slip velocity in the tangential direction on a fluid/fluid interface due to gradients in the surface tension coefficient. When the surface tension coefficient is constant, a two-fluid system may exist in static equilibrium. This is because the surface tension force may be exactly balanced by a jump in the pressure across the interface. The pressure is ...

Controlled Diffusion Micromixer

This model simulates an H-shaped micro-cell designed for controlled diffusive mixing. The cell puts two different laminar streams in contact for a controlled period of time. The contact surface is well-defined and, by controlling the flow rate, it is possible to control the amount of species that are transported from one stream to the other through diffusion. This example was originally ...

Electroosmotic Micromixer

Microlaboratories for biochemical applications often require rapid mixing of different fluid streams. At the microscale, flow is usually highly ordered laminar flow, and the lack of turbulence makes diffusion the primary mechanism for mixing. While diffusional mixing of small molecules (and therefore of rapidly diffusing species) can occur in a matter of seconds over distances of tens of ...

Electroosmotic Micropump

Micropumps, especially those based on electroosmotic flow (EOF), are essential components in microfluidic lab-on-a-chip devices, as they contain no moving parts and are relatively easy to integrate in microfluidic circuits during fabrication. One major drawback in the conventional design of electroosmotic micropumps is the use of a high driving voltage. Therefore, the development of a ...

A Drug Delivery System

This example describes the operation of a drug delivery system that supplies a variable concentration of a water soluble drug. A droplet with a fixed volume of water travels down a capillary tube at a constant velocity. Part of the capillary wall consists of a permeable membrane separating the interior of the capillary from a concentrated solution of the drug. As the drop passes by the membrane, ...

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