Microfluidic mixing enhancement using electrokinetic instability under electric field perturbations in a double T-shaped microchannel

NCUTIR > College of Engineering > Department of Refrigeration & Air Conditioning > 【冷凍空調與能源系】期刊論文 > Item 987654321/6409

Please use this identifier to cite or link to this item: http://ir.lib.ncut.edu.tw/handle/987654321/6409

Title:	Microfluidic mixing enhancement using electrokinetic instability under electric field perturbations in a double T-shaped microchannel
Authors:	駱文傑
Contributors:	冷凍空調與能源系
Date:	2009-04
Issue Date:	2017-10-12 13:34:01 (UTC+8)
Abstract:	The electrokinetic instability (EKI) phenomenon occurs when microfluidic flows with an electrical conductivity gradient are driven by a high-intensity external electrical field. Although EKI limits the robust performance of complex electrokinetic bioanalytical systems, it can be actively exploited to achieve the rapid mixing of micro- and nanoliter volume solutions in microscale devices. This paper investigates the EKI phenomenon in a double T-shaped microchannel, in which two aqueous electrolyte solutions with a 3.5:1 conductivity ratio are driven electrokinetically into the mixing channel via the application of a DC electrical field. A stratified flow condition is formed when the intensity of the applied DC electrical field is below a certain threshold value. However, as the intensity is increased, a series of flow circulations forms at the interfaces of neighboring solutions flows, and then propagates in the downstream direction when the intensity of the electrical field is increased beyond a certain critical threshold value. Electrical field intensity perturbations aligned in the direction of the conductivity gradient are then added to the DC electrical field at the upper inlet of the double T-shaped microchannel near the main mixing channel. It is found that these perturbations can stir the microfluidic instability and the induced flow instability conditions can enhance the mixing efficiency.
Relation:	Science in China series G: Physics Mechanics & Astronomy
Appears in Collections:	[Department of Refrigeration & Air Conditioning] 【冷凍空調與能源系】期刊論文

Files in This Item:

There are no files associated with this item.

View Licence

Loading...