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Transport in an Electrokinetic Valve

Application ID: 603

This application presents an example of pressure driven flow and electrophoresis in a 3D micro channel system. Researchers often use a device similar to the one in this model as an electrokinetic sample injector in biochips to obtain well-defined sample volumes of dissociated acids and salts and to transport these volumes.

Focusing is obtained through pressure driven flow of the sample and buffer solution, which confines the sample in the focusing channel. When steady state has been obtained, the pressure driven flow is turned off and an electric field is applied along the channels.

The electric field drives the dissociated sample ions that are found in the focusing zone at right angles to the focusing channel, through the injection channel. This is solved in the time-domain.

This model requires the Chemical Reaction Engineering Module and either the CFD Module or the Microfluidics Module.

This model is included as an example in the following products:

Chemical Reaction Engineering Module Microfluidics Module

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. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.