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Abstract
Laminar fluid flow and advection-dominant transport produce ineffective mixing conditions in micromixers. In these systems, a desirable fluid mixing over a short distance may be achieved using special geometries in which complex flow paths are generated. In this paper, a novel design, utilizing semi-circular ridges, is proposed to improve mixing in micro channels. Fluid flow and scalar transport are investigated employing Computational Fluid Dynamics (CFD) tool. Mixing dynamics are investigated in detail for alternative designs, injection, and diffusivity conditions. Results indicate that the convex alignment of semi-circular elements yields a specific, helicoidal-shaped fluid flow along the mixing channel which in turn enhances fluid mixing. In all cases examined, homogenous concentration distributions with mixing index values over 80% are obtained. When it is compared to the classical T-shaped micromixer, the novel design increases mixing index and mixing performance values by the factors of 8.7 and 3.3, respectively. It is also shown that different orientations of ridges adversely affect the mixing efficiency by disturbing the formation of helicoidal-shaped flow profile.
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Afzal A, Kim KY. Multi-Objective Optimization of a Passive Micromixer Based on Periodic Variation of Velocity Profile. CHEM ENG COMMUN 2014. [DOI: 10.1080/00986445.2013.841150] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Alam A, Afzal A, Kim KY. Mixing performance of a planar micromixer with circular obstructions in a curved microchannel. Chem Eng Res Des 2014. [DOI: 10.1016/j.cherd.2013.09.008] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Afzal A, Kim KY. Mixing Performance of Passive Micromixer with Sinusoidal Channel Walls. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2013. [DOI: 10.1252/jcej.12we144] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Arshad Afzal
- Department of Mechanical Engineering, Inha University
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