Design of fluid segments in microreactors: Influences of design factors on mixing by diffusion and product compositions

Nobuaki Aoki, Shinji Hasebe, Kazuhiro Mae

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The mixing operation that reactant fluids are split into many fluid segments to shorten diffusion length and thus mixing time is often used in microreactors. In this paper, we introduce two dimensionless numbers that represent effects of geometric design factors for the fluid segments, that is, arrangements and shapes of the fluid segment cross section at the reactor inlet, on the product yield for the reactors using this mixing operation. We also devise methods to determine the parameters. The dimensionless numbers are the ratio of reaction rate to diffusion rate φ and the aspect ratio of the mean diffusion length to the two-dimensional directions in the fluid segment w. To examine the validity of these parameters, we compare the yield of the desired product for a reactor having an arrangement and a shape of fluid segment cross sections at the reactor inlet with that for the reactor having rectangular cross section arranged in two-dimensional directions of the same dimensionless numbers using CFD (Computational Fluid Dynamics) simulations. The results show that the effect of arrangements for square cross section can be expressed by w, and that the order of φ allows us to determine whether a reactor is operated under the reaction-controlled condition even when the cross-sectional shapes are changed. Moreover, the effect of w on the product yield for cross-sectional shapes applied in this study, namely rectangle and right-angled triangle, is different when φ is fixed.

    Original languageEnglish
    Title of host publication8th Topical Conference on Microreaction Technology 2005, Held at the 2005 AIChE Spring National Meeting
    PublisherAmerican Institute of Chemical Engineers
    Pages113-123
    Number of pages11
    ISBN (Print)9781604234688
    Publication statusPublished - 2005 Jan 1
    Event8th Topical Conference on Microreaction Technology 2005, Held at the 2005 AIChE Spring National Meeting - Atlanta, GA, United States
    Duration: 2005 Apr 102005 Apr 14

    Other

    Other8th Topical Conference on Microreaction Technology 2005, Held at the 2005 AIChE Spring National Meeting
    CountryUnited States
    CityAtlanta, GA
    Period05/4/1005/4/14

    Keywords

    • Arrangements and shapes of fluid segments
    • Microreactor
    • Mixing by molecular diffusion
    • Yield and selectivity of multiple reactions

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)

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