This numerical study investigates the dynamics around a single Taylor bubble rising with small-dispersed bubbles in a vertical pipeline. The Volume-of-fluid (VOF) method in Ansys Fluent 18.1 is used to track the Taylor bubble, and the Discrete Particle Method (DPM) is used to track the small-dispersed bubbles, for the following parameter range; \(812 \leqslant \text{Re} \leqslant 5684\), \({\kern 1pt} Eo = 94\) and \(\log (Mo) = - 10.6\). The coupling strategies for both the continuous gas–liquid phase as well as the discrete bubble phase are all accounted for in the numerical calculations. The dispersed bubbles significantly affect the behaviour of the rising Taylor bubble in numerous ways. The terminal velocity increases with an increase in the number of dispersed bubbles. The rise velocity is, however directly correlated with the deformation of the nose of the bubble. The flow dynamics around the nose of the Taylor bubble are stronger for low velocities due to lower inertia. The computations also demonstrated that there are both acceleration and deceleration effects on the Taylor bubble. Our predictions are in quantitative agreement with published experimental results by Cerqueira and Paladino (Int. J. Multiph. Flow, vol. 133, p. 103,450, Dec. 2020).

这项数值研究调查了单个泰勒气泡在垂直管道中随着小分散气泡上升的动力学。Ansys Fluent 18.1中的Volume-of-fluid (VOF)方法用于跟踪泰勒气泡，离散粒子方法(DPM)用于跟踪分散的小气泡，参数范围如下；\(812 \leqslant \text{Re} \leqslant 5684\) , \({\kern 1pt} Eo = 94\)和\(\log (Mo) = - 10.6\). 连续气液相和离散气泡相的耦合策略都在数值计算中得到考虑。分散的气泡以多种方式显着影响上升的泰勒气泡的行为。终端速度随着分散气泡数量的增加而增加。然而，上升速度与气泡鼻部的变形直接相关。由于惯性较低，泰勒气泡鼻部周围的流动动力学对于低速来说更强。计算还表明，泰勒气泡既有加速作用，也有减速作用。我们的预测与 Cerqueira 和 Paladino 发表的实验结果定量一致（Int. J. Multiph. Flow，第 133 卷，第 103,450 页，2020 年 12 月）。