Publish in OALib Journal
APC: Only $99
Electrokinetic microfluidics is one of the main subcategories for sample transport in Micro-Total- Analysis-System. Numerical simulation is an efficient method for calculating and analyzing trans- port properties of samples in electrokinetic microfluidics. However, since the strong discontinuity exists at the interface of sample zone, the numerical dissipation near the interface becomes a key problem that can seriously influence the computational accuracy. In this paper, the reasons of numerical dissipation are theoretically analyzed and the techniques based on free interface reconstruction are provided to weaken the numerical dissipation. Firstly, the electric field and the flow field are solved by using the finite volume method. Then, in order to constraint the numerical dissipation, several techniques based on the volume of fluid (VOF) are utilized to reconstruct the flow vectors and solve the sample transport. Lastly, with the developed algorithm, capillary electrophoresis and electrokinetically driven enhanced mixing in microchannels are simulated. The results show that both FCT-VOF and TVD-VOF can significantly constraint the numerical dissipation while keeping the interface smoothing and are suitable for the simulation of electrokinetic microfluidics and other applications.