Design and Optimal Parameter Combination of a Novel Double-Layered Passive Micromixer
Date Issued
2015
Date
2015
Author(s)
Liu, Pao-Wen
Abstract
Unlike macroscope, fluid flows in lamination under microscope due to extremely low Reynolds number, which causes mixing so inefficient since the absence of turbulence and fluids mix mainly relying on diffusion. In order to improve the efficiency of the process, abundant of refined design on micromixers were proposed. This research presents a novel double-layered passive micromixer. Fluid is driven to go through sequential split-and-recombine (SAR) process by the combination of two simple structures: side channel and lateral slant channel. The angle of the slant channel, the width of the side channel, and the arrangement of the side channel are chosen as three design variables. By the aid of numerical simulation, the effect on flow field and the optimized combination of variables are analyzed. The result of simulation shows it only takes 497 μm along flow direction as mixing index (MI) hits 0.9 when the angle of the slant channel is 60 degree, and the side channel with width 20 μm arranging in the forward-form. The method of Polydimethylsiloxane (PDMS) re-casting is used in the manufacturing process, including laying the single layer of SU-8 negative photoresist structures on the 4” silicon wafer by carrying out photolithography and casting of the PDMS. The proper double-layered microchannel on the chip can then be achieved by bonding two single-layered structure chips together. Deionized water (D.I. water) with blue dye and yellow dye is used as operating fluid, and the optical microscope assembled with a CCD is used for observation.
Subjects
Micromixer
Passive
Double-layered structure
Numerical simulation
Type
thesis