The Effect of Particle Size on Acceleration Measurements in a Turbulent Flow

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We measure the accelerations of large neutrally buoyant particles (0.4 < d/c > 15) at Reynolds numbers of Rf = 400, 720. We present acceleration variance data which decreases with particle size, in very good agreement with the d-2/3 prediction obtained from a model which terminates the energy cascade at the size of the particles. In addition, we report that PDFs derived from this data display no significant particle size dependence. We also present a new method for determining particle size during data analysis, and suggest a possible derivation of the functional form for the transition from small to large particle behavior in neutrally buoyant particles from the pressure structure function.

    Item Description
    Name(s)
    Thesis advisor: Voth, Greg A.
    Date
    May 01, 2008
    Extent
    30 pages
    Language
    eng
    Genre
    Physical Form
    electronic
    Discipline
    Rights and Use
    In Copyright – Non-Commercial Use Permitted
    Digital Collection
    PID
    ir:1843