静止液滴中气泡破裂的喷射体积与液滴统计
The ejected volume and drop statistics by bubble bursting in a sessile drop
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中文总结 AI 辅助
本研究通过数值模拟揭示了静止液滴中气泡破裂的喷射体积与液滴尺寸分布规律，发现邦德数影响喷射量，重力决定携带量，且模拟结果与实验在速度上高度吻合。
中文摘要 AI 辅助
在基底上静止液滴内部的气泡破裂可以喷射出射流液滴，而在液体池中的气泡则不会。我们计算了其喷射的液体量以及喷射液滴的尺寸分布。随着邦德数从0.5减小到0.1，射流喷射的体积增加了一个数量级以上，然后趋于饱和；邦德数越大，抑制喷射所需的粘度越小。在零邦德数下，基底单独将喷射边界扩展到更大的奥内佐格数，这与预期相反，但在相同距离处却减少了喷射体积。重力决定了射流携带的液体量，而不是射流如何破碎：以其平均值缩放后，液滴尺寸分布与邦德数无关，并具有指数尾部，与自由空心液滴的情况相同。基于封闭的静止平衡族构建的模拟，在7%的误差范围内重现了第一个液滴的测量速度，而实验中发射的体积是相同几何形状下计算值的八到十倍。
英文摘要
A bubble bursting inside a drop resting on a substrate can eject jet droplets where a bubble at a bath would not. We compute how much liquid it ejects and how the ejected droplets are distributed in size. The volume ejected by the jet grows by more than an order of magnitude as the Bond number decreases from $0.5$ to $0.1$ and then saturates, and the larger the Bond number, the smaller the viscosity that suppresses ejection. At zero Bond number the substrate alone extends the ejection boundary to larger Ohnesorge numbers, contrary to expectation, and yet reduces the volume ejected at the same distance from it. Gravity sets how much liquid the jet carries, not how the jet fragments: scaled with its mean, the droplet-size distribution is independent of the Bond number and has an exponential tail, as for free hollow droplets. The simulations, built on a closed family of sessile equilibria, reproduce the measured velocity of the first droplet within 7\,\%, while the volumes emitted in experiments are eight to ten times those computed for the same geometry.
发表机构
- Universidad de Sevilla（塞维利亚大学）
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