The Evaporation and Rehydration Process of Aqueous Two Phase System (ATPS)
Evaporation of liquids on substrates is an important effect in many microscale applications, such as lab-on-a chip systems.  When the liquids are in droplets, the large surface area to volume ratio makes the evaporation dominate the interface migration.  In this project, we derive the theory and perform a numerical method to simulate the evaporation and rehydration process of an aqueous polymer two phase system (ATPS).  ATPS is a common liquid separation process which is composed by two different polymer solutions, such as polyethylene glycol (PEG) and Dextran (DEX).  Here, we first simulated the evaporation process of DEX solutions into the vapor environment.  After that, we simulated the rehydration process by dropping PEG solutions onto the dried DEX surface.  From our numerical model, we had successfully modeled the surface profile change and discussed how the substrate property and the humanity of environment would affect the final result.      
DEX droplet under evaporation.
The addition of PEG initiates the rehydration of DEX droplet.
ME 574 Course Project - Winter 2010
Nien-Tsu Huang, Win Khwa, Sukhoon Pyo, Junghwan Seo
(See full report here)
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