The microfluidic flows and mixing studies are becoming vital in the present era of 
miniaturization. The microfluidics-based biochips, also known as Lab-on-a-chip or bio-MEMS, are becoming increasingly popular for DNA analysis, clinical diagnotics and in the detection / manipulation of bio-molecules. Finding most suitable designs for these bio-MEMS is challenging and needs extensive research. At our laboratory, we study flow and mixing in the micro-devices by solving Navier-stokes equations using CFD Tools and computer codes. 
The flow and mixing in the microscale is quite different from macroscale. Firstly the fluid flow

in the microscale is affected by various other forces such as surface tension, electric forces (ex.: electroosmotic force) magnetic force etc. Secondly, due to the absence of convection currents and turbulent zones in the laminar micro flows, mixing is extremely slow as it depends on diffusion effect only.
 This laboratory aims at
1. Analyzing the influence of various forces, one by one on the fluid flow in micro devices using numerical simulation, so that the designer can predict the performance of the device prior to its fabrication.
2. Enhancing mixing by introducing chaos and quantification of mixing quality(mixing index, Lyapunov exponent etc.).













On the fundamental requirement of fluid flow to attain a chaotic mixing in micro-scale flows

Chaotic micro-mixing given by an electro-kinetic instability

Electro-osmotic flow under the action of a non-uniform zeta potential

Chaotic micro-mixing due to a control of magnetic effects

Analysis of fluid flow in micro-fluidic devices with complex geometry by using immersed-boundary methods

Numerical analysis for the interior and exterior flows of micro bubles with robust boundary conditions





Dept. of Mechanical Engrg. Dong-A University, 840, Hadandong, Saha-goo, Busan, 604-714, Korea.
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