Modeling and Optimization of Y-Type Micromixers

Micromachines

Valery Rudyak¹  Andrey Minakov² 

[1] Department of Theoretical Mechanics, Novosibirsk State University of Civil Engineering, Leningradskaya 113, 630008 Novosibirsk, Russia;Department of Thermophysics, Siberian Federal University, Kirensky 26, 660074 Krasnoyarsk, Russia; E-Mail:

关键词: micromixers;    microflow;    mixing;    CFD;    micro-particle image velocimetry (micro-PIV);    droplets;    volume of fluid (VOF);   

DOI  :  10.3390/mi5040886

来源: mdpi

【 摘 要 】

A trend in the global technological progress in the last few decades is the development of microsystem technology, microelectromechanical systems and corresponding technologies. Fluid mixing is an extremely important process widely used in various microfluidic devices (chemical microreactors, chemical and biological analyzers, drug delivery systems, etc.). To increase the mixing rate, it is necessary to use special devices: micromixers. This paper presents the results of a hydrodynamic simulation of Y-shaped micromixers. Flows are analyzed for both low and moderate Reynolds numbers. The passive and active mixers are considered. The dependence of the mixing efficiency on the Reynolds and Péclet numbers, as well as the possibility of using the hydrophobic and ultra-hydrophobic coatings is analyzed. Five different flow regimes were identified: (1) stationary vortex-free flow (Re < 5); (2) stationary symmetric vortex flow with two horseshoe vortices (5 < Re < 150); (3) stationary asymmetric vortex flow (150 < Re < 240); (4) non-stationary periodic flow (240 < Re < 400); and (5) stochastic flow (Re > 400). The maximum mixing efficiency was obtained for stationary asymmetric vortex flow.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.