Design and Performance Analysis for a Passive Micro-fluidic Mixer of PDMS

• Main Author: 賴俞任
• Other Authors: 林振德
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/58507774071925707057

碩士 === 國立交通大學 === 機械工程系所 === 93 === The importance of micromixers for microreaction technology demands some well-founded knowledge on the mixing behavior of these devices, since the flow in a micro-channel is laminar which makes mixing quite a difficult task to complete. In this study, we present a new chaotic mixer. In experiment, MEMS fabricated passive micro-mixers with cross obstacles, X-type grooves, and X-type obstacles by polydimethylsiloxane (PDMS) micro-mixer are considered, which lead to chaotic advection at low Reynolds number and also enhance fluids mixing. The influence of various Reynolds number to the three micromixers on the mixing efficiency is examined. Generally, chaotic advection can be generated by special geometries or induced by an external force. In addition to the experiment, CFD-ACE(U) Modules Software for simulating analysis on the mixing process is also performed and compared to experiment. Experimental results show that cross obstacles micro-mixer has great mixing efficiency and the mixing index will increase 82% when the Reynolds number is about 50.