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Open AccessArticle

Effects of Channel Wall Twisting on the Mixing in a T-Shaped Micro-Channel

School of Mechanical Engineering, Yeungnam University, Daehak-ro 280, Gyungsan 712-749, Korea
Micromachines 2020, 11(1), 26; https://doi.org/10.3390/mi11010026
Received: 15 November 2019 / Revised: 18 December 2019 / Accepted: 23 December 2019 / Published: 24 December 2019
(This article belongs to the Special Issue Optimization of Microfluidic Devices)
A new design scheme is proposed for twisting the walls of a microchannel, and its performance is demonstrated numerically. The numerical study was carried out for a T-shaped microchannel with twist angles in the range of 0 to 34π. The Reynolds number range was 0.15 to 6. The T-shaped microchannel consists of two inlet branches and an outlet branch. The mixing performance was analyzed in terms of the degree of mixing and relative mixing cost. All numerical results show that the twisting scheme is an effective way to enhance the mixing in a T-shaped microchannel. The mixing enhancement is realized by the swirling of two fluids in the cross section and is more prominent as the Reynolds number decreases. The twist angle was optimized to maximize the degree of mixing (DOM), which increases with the length of the outlet branch. The twist angle was also optimized in terms of the relative mixing cost (MC). The two optimum twisting angles are generally not coincident. The optimum twist angle shows a dependence on the length of the outlet branch but it is not affected much by the Reynolds number. View Full-Text
Keywords: T-shaped microchannel; degree of mixing; twisting angle T-shaped microchannel; degree of mixing; twisting angle
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Kang, D.J. Effects of Channel Wall Twisting on the Mixing in a T-Shaped Micro-Channel. Micromachines 2020, 11, 26.

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