International Conference on Nano/Micro Engineered and Molecular Systems (2009)
Jan. 5, 2009 to Jan. 8, 2009
Tsung-Han Tsai , Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
Dar-Sun Liou , Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
Ping-Hei Chen , Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
Chin-Ting Yang , Department of Mechanical and Computer-aided Engineering, St. John's University, Taipei, Taiwan
The purpose of this study is to develop a novel semi-active micro-mixer. The developed mixer has neither obstacles in microchannels or external electrical power sources outside the microchannel. However, an oil-base ferro-nanofluid is employed to segment two aqueous solutions into droplets when two aqueous solutions interact with the oil-based ferro-nanofluid at a dragonfly shape junction. The mixing between two aqueous solutions in the droplet can be significantly enhanced when the ferro-nanofluid carrying the droplets flow through a permanent magnet outside the microchannel. It is due to the reason that boundaries between the droplets and the oil-based ferro-nanofluid are distorted when the carrier ferro-nanofluid moves into and out of the magnetic field exerted by the permanent magnet. Since no external electrical power is required in the developed micromixer for enhancing the mixing between two aqueous solutions. This type of micro-mixer is called a “Semi-Active Micromixer”.
Chin-Ting Yang, Ping-Hei Chen, Tsung-Han Tsai and Dar-Sun Liou, "Enhancement of mixing performance of water solutions in a micro-mixer with immiscible ferrofluid," International Conference on Nano/Micro Engineered and Molecular Systems(NEMS), Shenzhen, China, 2009, pp. 69-74.