title: Optimal designs of staggered dean vortex micromixers.
abstract: A novel parallel laminar micromixer with a two-dimensional staggered Dean Vortex micromixer is optimized and fabricated in our study. Dean vortices induced by centrifugal forces in curved rectangular channels cause fluids to produce secondary flows. The split-and-recombination (SAR) structures of the flow channels and the impinging effects result in the reduction of the diffusion distance of two fluids. Three different designs of a curved channel micromixer are introduced to evaluate the mixing performance of the designed micromixer. Mixing performances are demonstrated by means of a pH indicator using an optical microscope and fluorescent particles via a confocal microscope at different flow rates corresponding to Reynolds numbers (Re) ranging from 0.5 to 50. The comparison between the experimental data and numerical results shows a very reasonable agreement. At a Re of 50, the mixing length at the sixth segment, corresponding to the downstream distance of 21.0 mm, can be achieved in a distance 4 times shorter than when the Re equals 1. An optimization of this micromixer is performed with two geometric parameters. These are the angle between the lines from the center to two intersections of two consecutive curved channels, θ, and the angle between two lines of the centers of three consecutive curved channels, ϕ. It can be found that the maximal mixing index is related to the maximal value of the sum of θ and ϕ, which is equal to 139.82°.
authors: Department of Biomechatronics Engineering, National Pingtung University of Science and Technology, 1, Shuefu Road, Neipu, Pingtung 91201, Taiwan; E-Mails: chaucer1114@gmail.com (C.H.C.); roni@ms13.url.com.tw (S.R.S.).
authors: Jyh Jian
authors: JJ
authors: Chen
authors: Chun Huei
authors: CH
authors: Chen
authors: Shian Ruei
authors: SR
authors: Shie
mesh_terms: D003198:Computer Simulation; D004058:Diffusion; D004867:Equipment Design; D000431:Ethanol / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents / Q000737:chemistry; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D018613:Microscopy, Confocal; D020113:Phenolphthalein / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry
chemical_list: D005456:Fluorescent Dyes; D007202:Indicators and Reagents; D000431:Ethanol; D012972:Sodium Hydroxide; D020113:Phenolphthalein