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MEMS Module
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Fluid-Structure Interaction
This is a model exemplifying how fluid-structure interactions can be modeled using COMSOL Multiphysics. Viscous forces and the system’s pressure impose forces to the surface of a structure. The deformation in the soft structure is not small and the fluid regime will therefore dynamically change. T...
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Fluid-Structure Interaction with Two Fluid Phases
The following example demonstrates techniques for modeling a fluid-structure interaction containing two fluid phases in COMSOL Multiphysics. It illustrates how a heavier fluid can induce movement in an obstacle using the arbitrary Lagrangian-Eulerian (ALE) technique along with the Two-Phase Flow, Ph...
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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 optimi...
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Inkjet
This example demonstrates how to model the fluid flow from an inkjet, for instance, within an inkjet printer. An ink droplet is ejected through a nozzle and travels through air until it hits the target.
A conservative level set method is used to track the interface between air and ink. The fluid...
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Hydrocarbon Dehalogenation in a Tortuous Microreactor
Removing halogen groups from hydrocarbons is an important reaction step in several chemical processes. One application is water purification. Other examples involve organic synthesis, where the removal of halogen groups serves as a starting point for carbon-carbon coupling reactions. Typically, the...
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Cantilever Beam
The elastic cantilever beam is one of the elementary structures used in MEMS designs.
This model shows the bending of a cantilever beam under an applied electrostatic load. This is computed from the electric field that is solved in the deforming geometry/mesh domain using the Arbitrary Lagrangian...
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Microresistor Beam
The example illustrates the ability to couple thermal, electrical, and structural analysis in the one model. This particular application displaces part of a beam by passing a current through it; the current generates heat, and the temperature increase leads to displacement through thermal expansion....
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AC Electrokinetically Enhanced Surface Reactions
This model studies the use of AC electrokinetic forces to enhance the rate of transport of electrolytic reactants to a reaction surface on the wall of a microchannel.
If transport was to be governed by flow alone, then the flow velocity perpendicular to the surface would be so small that the ana...
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Electroosmotic Flow in a Biochip
Miniature laboratories are required to efficiently analyze the information in human DNA. Such laboratories could facilitate tailor-made diagnoses and treatment of hereditary diseases for each individual.
One problem that arises in these lab-on-a-chip devices lies in the transport of the liquid s...
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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 ther...
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