Reynolds Number Dependences of Velocity Field and Fluid Mixing in Partitioned-Pipe Mixer(Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics and Fluid Mechanics)
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概要
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The dependence of the chaotic mixing of fluids on the Reynolds number Re in a partitioned-pipe mixer (PPM), composed of alternately placed horizontal and vertical plates in a rotating cylinder, is studied. By numerically calculating the steady velocity field due to this rotation and an axial pressure gradient, we find that the three-dimensionality of the velocity field becomes weaker with increasing Re from zero. From the computation of trajectories of fluid particles in this velocity field, we also find that tubular transport barriers extending straight in the axial direction initially expand as Re is increased. Although these barriers usually disappear with the further increase in Re, some of them survive even up to a relatively large Re when the ratio of the lengths of neighboring plates is markedly different from unity. Moreover, high-shear regions are observed away from the rigid walls for a sufficiently large Re. Therefore, we conclude that the size of the transport barriers does not simply depend on Re, and that the mixing efficiency outside these barriers is expected to be enhanced by the appearance of high-shear regions with increasing Re.
- 社団法人日本物理学会の論文
- 2005-05-15
著者
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Funakoshi Mitsuaki
Kyoto Univ. Kyoto
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Funakoshi Mitsuaki
Department Of Applied Analysis And Complex Dynamical Systems Graduate School Of Informatics Kyoto Un
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MIZUNO Yoshinori
Department of Applied Analysis and Complex Dynamical Systems, Graduate School of Informatics, Kyoto
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Mizuno Yoshinori
Department Of Applied Analysis And Complex Dynamical Systems Graduate School Of Informatics Kyoto Un
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MIZUNO Yoshinori
Department of Applied Analysis and Complex Dynamical Systems, Graduate School of Informatics, Kyoto University:(Present address)Dept. of Computational Science and Engineering, Nagoya University
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