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Research Papers: Flows in Complex Systems

An Enhanced One-Layer Passive Microfluidic Mixer With an Optimized Lateral Structure With the Dean Effect

[+] Author and Article Information
Teng Zhou

School of Mechanical Engineering,
Yeungnam University,
Gyeongsan 712-749, South Korea

Yifan Xu, Zhenyu Liu

Changchun Institute of Optics
Fine Mechanics and Physics (CIOMP),
Chinese Academy of Science,
Changchun, Jilin 130033, China

Sang Woo Joo

School of Mechanical Engineering,
Yeungnam University,
Gyeongsan 712-749, South Korea
e-mail: swjoo@yu.ac.kr

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 14, 2015; final manuscript received March 29, 2015; published online May 19, 2015. Assoc. Editor: Shizhi Qian.

J. Fluids Eng 137(9), 091102 (May 19, 2015) (7 pages) Paper No: FE-15-1026; doi: 10.1115/1.4030288 History: Received January 14, 2015

Topology optimization method is applied to a contraction–expansion structure, based on which a simplified lateral flow structure is generated using the Boolean operation. A new one-layer mixer is then designed by sequentially connecting this lateral structure and bent channels. The mixing efficiency is further optimized via iterations on key geometric parameters associated with the one-layer mixer designed. Numerical results indicate that the optimized mixer has better mixing efficiency than the conventional contraction–expansion mixer for a wide range of the Reynolds number.

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Figures

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Fig. 1

Schematic of CAE in (a) front view and (b) Isometric drawing. Blue shade shows the optimization domain. Ha: width of expansion domain; La: length of expansion domain; Lp: distance between the periods of the mixer; Hb: width of contraction domain; and D: channel depth.

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Fig. 2

The structure of the design domain for the simulation (a) before and (b) after optimization. Initially rigid domain, shown in solid black, is partially converted to fluid channel, shown in white, through optimization process.

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Fig. 3

Lateral structure. R and r are the radii of the semicircles centered at O1 and O2, respectively. Lo1 is the position of center of semicircles in x direction, and Lo1 = R = 1/2 La. Lb and Lc are widths of two rectangles, and Lb + Lc = 2R. Ho1 depicts the position of O2 and the height of the small rectangle. Hb is the width for the contraction channel.

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Fig. 4

(a) The streamline. The color denotes the velocity. The cross plane A-A is 20 μm from the inlet to lateral structure, B-B cross plane is about 20 μm to the outlet of lateral structure. The velocity field and the (v, w) arrow plot of the cross planes (b) A-A and (c) B-B.

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Fig. 5

Streamlines in (a) y direction with distance from the wall of 10 μm, 1/5 of channel width (b) z direction with distance from the bottom of 50 μm, 4/5 of channel depth, the color denotes the distance from the wall in z direction above

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Fig. 6

Arrangement of lateral structures (a) in two sides, G denotes the distance between the periodic structures. (b) The serpentine structures, Hb, denote the width of the turning, same as the width of main channel. Here, Ga = Gb, Ga + Gb + Hb = G.

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Fig. 7

(a) The streamlines in the turning. The cross planes A-A and B-B to the turning is about 20 μm. The velocity field and (v, w) arrow plot for the cross planes A-A and B-B with (b) Re = 5 and (c) 150.

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Fig. 8

(a) The arrangement of the lateral structure for the mixer. The benchmark is the original contraction–expansion mixer. T12-1 and T12-2 denote the chips with structures arranged in two sides for the period with one and two lateral structures. One side corresponds to the chip with all the lateral structures in the same side. S12-1 and S12-2 denote serpentine structure with a period of one and two lateral structures. (b) Mixing efficiency of chips with different arrangements versus Reynolds number, Re, compared against the contraction–expansion chip before optimization. (c) Mixing efficiency of chips with different depth versus Reynolds number, Re.

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Fig. 9

Mixing efficiency for different number of periods for S12-1 mixer. (a), (b), (c), and (d) represent the cross sections of the first, second, third, and fourth contraction regions after the lateral structure, respectively, for Re = 25.

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Fig. 10

Mixing efficiency for different number of periods for the original contraction–expansion mixer. (a)–(d) represent the cross sections of the first, second, third, and fourth contraction regions after the expansion structure, respectively, for Re = 25.

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