NDLI: Experimental optimization of a passive planar rhombic micromixer with obstacles for effective mixing in a short channel length

Content Provider	Royal Society of Chemistry (RSC)
Author	Ribeiro, Susana Covas, José António Alves, Pedro Urbano Martins, Rodrigo Baptista, Pedro Viana Hilliou, Loic Busani, Tito Águas, Hugo Bernacka-Wojcik, Iwona Fortunato, Elvira Wojcik, Pawel Jerzy
Copyright Year	2014
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.
Starting Page	56013
Ending Page	56025
Page Count	13
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	4
Issue Number	99
Journal	RSC Advances
DOI	10.1039/c4ra10160j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Geometry Reynolds number Micrometre Rhombus Micromixer
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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