Numerical Studies of Disperse Three-Phase Fluid Flows
Numerical Studies of Disperse Three-Phase Fluid Flows
复制标题
DOI：
10.3390/fluids6090317
复制
发表时间：
2021-09
期刊：
影响因子：
1.9
通讯作者：
L. Zeng;D. Velez;Jiacai Lu;G. Tryggvason
中科院分区：
文献类型：
--
作者：
L. Zeng;D. Velez;Jiacai Lu;G. Tryggvason
采用直接数值模拟的方法研究了气液液三相多相系统的动力学。该系统由连续的液态、浮力气泡和相对于连续液体下落的较小的重液滴组成。计算域是完全周期性的，并添加一个等于混合物重量的力来保持它在适当的位置。控制参数的选择使气泡和液滴的终端雷诺数适中；同时通过改变气泡的表面张力来考察气泡变形性的影响，液滴的表面张力足够高，因此它们不会变形。研究了“单胞”中的一个气泡和八个自由相互作用的气泡。考察了滑移速度、速度波动和分散相分布与各相体积分数的关系。研究发现，虽然在“单胞”中单个气泡周围的液滴分布是不均匀的，并且取决于其变形能力，但对于本研究所考察的参数，液滴在自由相互作用气泡周围的分布是相对均匀的。
The dynamics of a three-phase gas–liquid–liquid multiphase system is examined by direct numerical simulations. The system consists of a continuous liquid phase, buoyant gas bubbles, and smaller heavy drops that fall relative to the continuous liquid. The computational domain is fully periodic, and a force equal to the weight of the mixture is added to keep it in place. The governing parameters are selected so that the terminal Reynolds numbers of the bubbles and the drops are moderate; while the effect of bubble deformability is examined by changing its surface tension, the surface tension for the drops is sufficiently high so they do not deform. One bubble in a “unit cell” and eight freely interacting bubbles are examined. The dependency of the slip velocities, the velocity fluctuations, and the distribution of the dispersed phases on the volume fraction of each phase are examined. It is found that while the distribution of drops around a single bubble in a “unit cell” is uneven and depends on its deformability, the distribution of drops around freely interacting bubbles is relatively uniform for the parameters examined in this study.