C-225 空間周期的な 3 次元流における流体の混合過程

概要

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The chaotic mixing of fluids due to a creeping flow in partitioned-pipe mixer (PPM) is studied by using a numerically obtained velocity field. The PPM is composed of alternately placed horizontal and vertical plates in a cylindrical duct rotating with a constant angular velocity. This rotation and an axial pressure gradient generate the flow in the PPM. We examine the dependence of the mixing performance for many axial periods on the parameters of this system. Furthermore, we calculate the maximum cross-sectional stretching rate, λ, of the infinitesimal line segments along each trajectory for specified axial ranges. We then obtain two typical types of the evolution of λ, and find that they are distinguished by the distance between their cross-sectional initial positions and the lines of separation, defined as the set of cross-sectional initial locations of fluid particles which move to one of the leading edges of the plates within a specified periods.
日本流体力学会の論文
2003-07-28