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 > interobstacles distance. The pressure drop measured after three rhombi depends mainly on Re and interobstacle distance. The resulting optimum geometry for the low Re regime has a contraction width of 101 mu m and inter-obstacles distance of 93 mu m, while for the high Re regime a contraction width of 400 v and inter-obstacle distance of 121 mu m are more appropriate. These mixers enabled 80% mixing efficiency creating a pressure drop of 6.0 Pa at Re = 0.1 and 5.1 x 10(4) Pa at Re = 117.6, with a mixer length of 2.5 mu m. To the authors' knowledge, the developed mixer is one of the shortest planar passive micromixers reported to date.
Original languageUnknown
Pages (from-to)56013-56025
JournalRSC ADVANCES
Volume4
Issue number99
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

    Cite this

    @article{637a9984d500404ab73fd182f273ecf1,
    title = "Experimental optimization of a passive planar rhombic micromixer with obstacles for effective mixing in a short channel length",
    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 > interobstacles distance. The pressure drop measured after three rhombi depends mainly on Re and interobstacle distance. The resulting optimum geometry for the low Re regime has a contraction width of 101 mu m and inter-obstacles distance of 93 mu m, while for the high Re regime a contraction width of 400 v and inter-obstacle distance of 121 mu m are more appropriate. These mixers enabled 80{\%} mixing efficiency creating a pressure drop of 6.0 Pa at Re = 0.1 and 5.1 x 10(4) Pa at Re = 117.6, with a mixer length of 2.5 mu m. To the authors' knowledge, the developed mixer is one of the shortest planar passive micromixers reported to date.",
    keywords = "EFFICIENCY, PDMS, MICROCHANNELS, GEOMETRIES, REYNOLDS-NUMBER RANGE, FLOW",
    author = "Fortunato, {Elvira Maria Correia} and {\'A}guas, {Hugo Manuel Brito} and Busani, {Tito Livio} and Martins, {Rodrigo Ferr{\~a}o de Paiva} and Baptista, {Pedro Miguel Ribeiro Viana}",
    year = "2014",
    month = "1",
    day = "1",
    doi = "10.1039/c4ra10160j",
    language = "Unknown",
    volume = "4",
    pages = "56013--56025",
    journal = "RSC ADVANCES",
    issn = "2046-2069",
    publisher = "Royal Society of Chemistry",
    number = "99",

    }

    TY - JOUR

    T1 - Experimental optimization of a passive planar rhombic micromixer with obstacles for effective mixing in a short channel length

    AU - Fortunato, Elvira Maria Correia

    AU - Águas, Hugo Manuel Brito

    AU - Busani, Tito Livio

    AU - Martins, Rodrigo Ferrão de Paiva

    AU - Baptista, Pedro Miguel Ribeiro Viana

    PY - 2014/1/1

    Y1 - 2014/1/1

    N2 - 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 > interobstacles distance. The pressure drop measured after three rhombi depends mainly on Re and interobstacle distance. The resulting optimum geometry for the low Re regime has a contraction width of 101 mu m and inter-obstacles distance of 93 mu m, while for the high Re regime a contraction width of 400 v and inter-obstacle distance of 121 mu m are more appropriate. These mixers enabled 80% mixing efficiency creating a pressure drop of 6.0 Pa at Re = 0.1 and 5.1 x 10(4) Pa at Re = 117.6, with a mixer length of 2.5 mu m. To the authors' knowledge, the developed mixer is one of the shortest planar passive micromixers reported to date.

    AB - 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 > interobstacles distance. The pressure drop measured after three rhombi depends mainly on Re and interobstacle distance. The resulting optimum geometry for the low Re regime has a contraction width of 101 mu m and inter-obstacles distance of 93 mu m, while for the high Re regime a contraction width of 400 v and inter-obstacle distance of 121 mu m are more appropriate. These mixers enabled 80% mixing efficiency creating a pressure drop of 6.0 Pa at Re = 0.1 and 5.1 x 10(4) Pa at Re = 117.6, with a mixer length of 2.5 mu m. To the authors' knowledge, the developed mixer is one of the shortest planar passive micromixers reported to date.

    KW - EFFICIENCY

    KW - PDMS

    KW - MICROCHANNELS

    KW - GEOMETRIES

    KW - REYNOLDS-NUMBER RANGE

    KW - FLOW

    U2 - 10.1039/c4ra10160j

    DO - 10.1039/c4ra10160j

    M3 - Article

    VL - 4

    SP - 56013

    EP - 56025

    JO - RSC ADVANCES

    JF - RSC ADVANCES

    SN - 2046-2069

    IS - 99

    ER -