Experimental optimization of a passive planar rhombic micromixer with obstacles for effective mixing in a short channel length
Bernacka-Wojcik, Iwona and Ribeiro, Susana and Wojcik, Pawel Jerzy and Alves, Pedro Urbano and Busani, Tito and Fortunato, Elvira and Baptista, Pedro Viana and Covas, José António and Águas, Hugo and Hilliou, Loic and Martins, Rodrigo (2014) Experimental optimization of a passive planar rhombic micromixer with obstacles for effective mixing in a short channel length. RSC Advances, 4 (99). pp. 56013-56025. ISSN 2046-2069 (https://doi.org/10.1039/C4RA10160J)
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Abstract
This paper presents the performance of a passive planar rhombic micromixer with diamond-shaped obstacles and a rectangular contraction between the rhombi. The device was experimentally optimized using water for high mixing efficiency and a low pressure drop over a wide range of Reynolds numbers (Re = 0.1–117.6) by varying geometrical parameters such as the number of rhombi, the distance between obstacles and the contraction width. Due to the large amount of data generated, statistical methods were used to facilitate and improve the results of the analysis. The results revealed a rank of factors influencing mixing efficiency: Reynolds number > number of rhombi > contraction width > inter-obstacles distance. The pressure drop measured after three rhombi depends mainly on Re and inter-obstacle distance. The resulting optimum geometry for the low Re regime has a contraction width of 101 μm and inter-obstacles distance of 93 μm, while for the high Re regime a contraction width of 400 μm and inter-obstacle distance of 121 μm are more appropriate. These mixers enabled 80% mixing efficiency creating a pressure drop of 6.0 Pa at Re = 0.1 and 5.1 × 104 Pa at Re = 117.6, with a mixer length of 2.5 mm. To the authors' knowledge, the developed mixer is one of the shortest planar passive micromixers reported to date.
ORCID iDs
Bernacka-Wojcik, Iwona, Ribeiro, Susana, Wojcik, Pawel Jerzy, Alves, Pedro Urbano ORCID: https://orcid.org/0000-0003-3447-6878, Busani, Tito, Fortunato, Elvira, Baptista, Pedro Viana, Covas, José António, Águas, Hugo, Hilliou, Loic and Martins, Rodrigo;-
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Item type: Article ID code: 67634 Dates: DateEvent14 October 2014Published14 October 2014AcceptedSubjects: Technology > Chemical engineering
Science > PhysicsDepartment: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 29 Apr 2019 09:04 Last modified: 13 Oct 2024 00:37 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/67634