Numerical Analysis of Turbulence Structures Induced in a Dispersed Three-Phase Flow.
Numerical Analysis of Turbulence Structures Induced in a Dispersed Three-Phase Flow.
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分散三相流中引起的湍流结构的数值分析。
DOI：
10.1299/kikaib.66.323
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
F. Yamamoto
中科院分区：
文献类型：
--
作者：
A. Kitagawa;Y. Murai;J. Ohta;F. Yamamoto
本文讨论了一种数值方法及其在含气泡和颗粒的三相流中诱导的湍流结构预测中的应用。在前人的研究中，泡状两相流的欧拉-拉格朗日模型在数学上得到了验证，并建立了泡状两相流的欧拉-拉格朗日模型。进行了二维和三维预测，并提供了详细的现象学信息的三相相互作用过程。当气泡和颗粒体积分数小于5%时，由于体积力谱的减小，三相流中的动能产生比两相流中的动能产生减少得更多。特别是对于长波长的湍流，由于气泡和颗粒的局部弥散作用抵消了中尺度体积力，使得长波长的湍流发展不明显。在高波数区，能谱的合成斜率比泡状两相流情况下的类似现象要平静得多。
This paper is concerned with a numerical method and its application to the prediction for turbulence structure which is induced in three-phase flows containing bubbles and particles. The Eulerian-Lagrangian model for three-phase flows has been constructed since the mathematical validity of the model was confirmed for bubbly two-phase flow in previous papers. Two-and three -dimensional predictions were carried out and provided detailed phenomenological information on three-phase interaction processes. When the bubble and the particle volume fractions were less than 5%, generation of kinetic energy was reduced more in three-phase flow than in two-phase flow , because of decrease in body force spectrum. Especially, the turbulence with long wave length was not strongly grown because of cancelation of meso-scale body force due to local dispersion of the bubbles and the particles. Resultant slope of energy spectrum in high wavenumber region became much calmer than the similar phenomena in bubbly two-phase flow cases.