Insight into the micro scale dynamics of a micro fluidic wetting-based conveying system by particle based simulation |
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Authors: | Jan?Lienemann Email author" target="_blank">Dennis?Wei?Email author Andreas?Greiner David?Kauzlaric Oliver?Grünert Jan?G?Korvink |
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Affiliation: | 1.Department of Microsystems Engineering (IMTEK),University of Freiburg,Freiburg,Germany;2.Freiburg Institute for Advanced Studies (FRIAS),University of Freiburg,Freiburg,Germany;3.Schmidt and Partner Engineering AG (SPEAG),Zürich,Switzerland |
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Abstract: | We simulate a microfluidic conveying system using the many-body dissipative particle dynamics method (MDPD). The conveying
system can transport micro parts to a specified spot on a surface by letting them float inside or on top of a droplet, which
is pumped by changing the wetting behaviour of the substrate, e.g., with electrowetting on dielectrics. Subsequent evaporation
removes the fluid; the micro part remains on its final position, where a second substrate can pick it up. In this way, the
wetting control can be separate from the final device substrate. The MDPD method represents a fluid by particles, which are
interpreted as a coarse graining of the fluid’s molecules. The choice of interaction forces allows for free surfaces. To introduce
a contact angle model, non-moving particles beyond the substrate interact with the fluid particles by MDPD forces such that
the required contact angle emerges. The micro part is simulated by particles with spring-type interaction forces. |
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