Numerical Simulations of Stomach-like Micromixer on a Rotating Disk

• Main Authors: Chia-Wei Chang, 張家維
• Other Authors: 陳志敏
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/08078385300603254870

碩士 === 中興大學 === 機械工程學系所 === 95 === This paper presents a numerical study of fluid mixing in a stomach-like micromixer that is undergoing clockwise or counter-clockwise rotation. It is found that the centrifugal force generated during rotation propels the fluids in the radial direction, and the mixing is enhanced mainly due to the vortex formed in the micromixer in couple with the lateral secondary flow induced by the Coriolis force. The mixing efficiency increases with increasing rotational speed. The mixing efficiency can reach as much as 70% at a speed of 720 rpm for the clockwise case while the counter-clockwise rotating mixing can only reach as high as 63%~69% up to a speed of 1500 rpm. It is also found that the mixer with a larger channel depth shows better mixing efficiency. The present numerical simulations are in good agreement with the flow visualization carried out using fluids of ferric chloride and ammonium thiocyanate solutions.