Effect of rotation on the electrohydrodynamic instability of a thin fluid layer with conductivity gradient.
|Keywords:||電流體力學;等電位聚焦電泳;蛋白質分離;electrohydrodynamic;instability;isoelectric focusing||Issue Date:||2008||Abstract:||
Interest in electrohydrodynamic instability of a solution with an electric conductivity stems from the so-called isoelectric focusing (IEF) technique, which is a separation process used to isolate and purify biological materials such as protein. Under imposing an appropriate electric field, materials of different composition will gather at places of different pH values and eventually the materials can be separated successfully. In general, a higher electric field makes a more efficient separation. However, once the applied electric field exceeds a critical value, the fluid will acquire sufficient energy to overcome the viscous force and becomes unstable, that is the most undesired situation. Recently, many researchers are devoted to explore the destabilizing mechanism by the hydrodynamic instability analysis. They either depicted parametric maps for optimizing design or imposed additional mechanisms on the system for the improvement of performance. Many good ideas have been proposed and a number of related achievements have also been reported. This study aims to investigate the dependence of the rotational effect on the stability of conducting fluids. The result shows that an imposition of a constant angular velocity can suppress the growth of disturbances and stabilize the flow. This concludes that the rotation effect can indeed improve the efficiency of IEF process.
|Appears in Collections:||應用力學研究所|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.