Motion of spherical bubbles in homogeneous shear turbulence
Motion of spherical bubbles in homogeneous shear turbulence
复制标题
球形气泡在均匀剪切湍流中的运动
DOI：
10.1088/1873-7005/ab1572
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发表时间：
2019
影响因子：
1.5
通讯作者：
Mitsuru Tanaka
中科院分区：
文献类型：
--
作者：
Mitsuru Tanaka
对受到水平方向均匀剪切的垂直流的均匀湍流中球形气泡的运动进行了完全解析的模拟，以了解湍流对上升气泡横向迁移的影响。假设气泡被表面活性剂完全污染，可视为轻质固体颗粒。采用浸入边界法来表示球形气泡。我们关注的是基于柯尔莫哥洛夫尺度的斯托克斯数几乎一致的气泡。伽利略数设置在 35-50 范围内，层流剪切流中预计会出现正升力。数值结果表明，在湍流中，平均横向迁移的方向是相反的，就像小干净气泡的情况一样（Tanaka 2013 J. Phys. Soc. Japan 82, 044401）。研究还发现，涡流层旁低速区域积聚的气泡运动主要有助于气泡横向迁移方向的反转。
A fully resolved simulation is performed on the motion of spherical bubbles in homogeneous turbulence subject to a vertical flow that is uniformly sheared in a horizontal direction in order to understand the effect of turbulence on the transverse migration of rising bubbles. It is assumed that bubbles are fully-contaminated by surfactants and can be regarded as light solid particles. An immersed boundary method is adopted to represent a spherical bubble. We focus on the bubbles whose Stokes number based on the Kolmogorov scale is nearly unity. The Galileo number is set in the range of 35–50, for which positive lift is expected in laminar shear flow. Numerical results show that the direction of the mean transverse migration is reversed in turbulence, as in the case of small clean bubbles (Tanaka 2013 J. Phys. Soc. Japan 82, 044401). It is also found that the motion of the bubbles accumulated in the low-speed regions beside vortex layers mainly contributes to the reversal of the direction of the bubble transverse migration.
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影响因子：
4.6
作者：
Xiaolong Yin;D. Koch
通讯作者：
Xiaolong Yin;D. Koch
DOI：
10.1098/rsta.2008.0023
发表时间：
2008-06
期刊：
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
影响因子：
--
作者：
S. Takagi;T. Ogasawara;Y. Matsumoto
通讯作者：
S. Takagi;T. Ogasawara;Y. Matsumoto
影响因子：
4.6
作者：
Aliseda, A.;Lasheras, J. C.
通讯作者：
Lasheras, J. C.
影响因子：
4.7
作者：
T. Hibiki;M. Ishii
通讯作者：
T. Hibiki;M. Ishii
影响因子：
1.7
作者：
Mitsuru Tanaka
通讯作者：
Mitsuru Tanaka