AI 中文总结
本研究通过嵌入边界模拟揭示气泡链诱导液体流动的物理机制，开发降阶模型复现实验观测的均匀向上流，表明流动由气泡轨迹而非仅分散宽度决定。
AI 中文摘要
近期实验观测显示，洁净球形气泡链会产生近乎均匀的向上液体流动，然而该液体流动的物理起源仍不明确。为此，本研究采用高精度嵌入边界模拟，探究对齐排列气泡链中的流体动力学相互作用，该模拟可解析界面边界层并捕捉多个洁净球形气泡间的长程相互作用。模拟用于量化气泡链内流体动力学相互作用的演化，确定气泡诱导液体流动可由孤立气泡远尾流叠加表示的条件。基于上述发现，开发了降阶模型并将其应用于实验测量的气泡轨迹，该模型成功复现了实验中观测到的近乎均匀向上液体流动。为阐明气泡分散的作用，将预测结果与相同总分散宽度的均匀分散气泡排列的预测结果进行对比：均匀分散排列产生中心峰值的速度分布，仅实验观测的气泡轨迹复现了近乎均匀的向上液体流动。这些结果表明，液体流动不仅由分散宽度决定，还由建立远尾流空间分布的气泡轨迹决定。本研究提供了连接气泡间流体动力学相互作用、气泡分散及气泡诱导液体流动的物理框架，同时给出了预测气泡链产生液体流动的降阶模型。
英文摘要
Recent experimental observations revealed that clean spherical bubble chains generate a nearly uniform upward liquid flow. The physical origin of this liquid flow, however, remains unclear. Hydrodynamic interactions in aligned bubble chains were therefore investigated using high-accuracy embedded-boundary simulations that resolve the interfacial boundary layer while capturing long-range interactions among multiple clean spherical bubbles. The simulations were used to quantify the evolution of hydrodynamic interactions within bubble chains and to identify the conditions under which bubble-induced liquid flow can be represented by the superposition of isolated-bubble far wakes. Based on these findings, a reduced-order model was developed and applied to experimentally measured bubble trajectories. The model successfully reproduced the nearly uniform upward liquid flow observed in the experiments. To clarify the role of bubble dispersion, the predictions were compared with those for a uniformly dispersed bubble arrangement having the same overall dispersion width. While the uniformly dispersed arrangement produced a center-peaked velocity distribution, only the experimentally observed bubble trajectories reproduced the nearly uniform upward liquid flow. These results demonstrate that the liquid flow is governed not simply by the dispersion width but by the bubble trajectories that establish the spatial distribution of far wakes. The present study provides a physical framework linking hydrodynamic interactions among bubbles, bubble dispersion, and bubble-induced liquid flow, together with a reduced-order model for predicting the liquid flow generated by bubble chains.
