| 초록 |
The electrokinetic flow of an electrolyte solution through a rectangular microchannel is studied. The flow characteristics in microchannels are important for the development of MEMS and microfluidic devices. Recent improvement in material sciences and manufacturing enables the application of micro flow more versatile as mirochannel heat sinks for cooling microdevices, micro reactors, flow through synthetic membranes with capillary pores and micro pumps. The presence of the electrical double layer near a solid-liquid interface gives the electroviscous effect on pressure-driven liquid flow through microchannels. The equation of motion of the system, which has a form of second order elliptic partial differential equation, is numerically solved by means of a finite difference method. An external body force originated from the electrostatic interaction between Poisson-Boltzmann field and the flow-induced electrical field is applied to solve the equation. With given physicochemical parameters, velocity profiles as well as electrostatic potential profiles of the electrolyte solution are obtained. The effects of the ionic concentration of the fluid, electric field, and the width of microchannels are analyzed. |
