Effects of channel geometry on mixing performance of micromixers using collision of fluid segments

Nobuaki Aoki, Kazuhiro Mae

    Research output: Contribution to journalArticlepeer-review

    64 Citations (Scopus)


    This paper shows effects of design factors for micromixers using the collision of fluid segments on mixing performance. Design factors are collision zone diameter, outlet channel diameter, collision angle of reactant fluids, and number of fluid segments for collision. We evaluate mixing performances of T- and Y-shape micromixers and the K-M mixer using the Villermaux/Dushman reaction. When the Reynolds number in the outlet channel, Re, is less than 200, the fluid segment size determined by only channel geometries, Wc, and Re are significant on mixing performance. From the results in this Re range, we correlate the by-product UV absorbance with the effective fluid segment size after collision, We = Wc/Ren. The absorbance is linearly fitted with We. Thus, We expresses effects of total flow rate, outlet channel diameter, and number of fluid segments for collision on mixing performance. We can improve mixing performance by increasing flow rates as well as reducing channel sizes, leading to avoid extremely small channels to improve mixing performance and a high pressure drop in mixer channels. When Re > 200, high share rates applied to fluid segments also enhance the mixing performance. This indicates that high mixing performance and high throughput can be achieved simultaneously.

    Original languageEnglish
    Pages (from-to)189-197
    Number of pages9
    JournalChemical Engineering Journal
    Issue number3
    Publication statusPublished - 2006 May 15


    • Channel geometry
    • Collision of fluid segments
    • Micromixer
    • Reynolds number
    • Share rate

    ASJC Scopus subject areas

    • Chemistry(all)
    • Environmental Chemistry
    • Chemical Engineering(all)
    • Industrial and Manufacturing Engineering


    Dive into the research topics of 'Effects of channel geometry on mixing performance of micromixers using collision of fluid segments'. Together they form a unique fingerprint.

    Cite this