Jiang Xinghua, Rotily Lucas, Villermaux Emmanuel, Wang Xiaofei
Department of Environmental Science and Engineering, Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, <a href="https://ror.org/013q1eq08">Fudan University</a>, Shanghai 200433, China.
Aix Marseille Université, CNRS, Centrale Marseille, <a href="https://ror.org/03zq0xc17">IRPHE</a> UMR 7342, 13384 Marseille, France.
Phys Rev Lett. 2024 Jul 12;133(2):024001. doi: 10.1103/PhysRevLett.133.024001.
Over the past century, drops production mechanisms from bubble bursting have been extensively studied. They include the centrifugal fragmentation of liquid ligaments from the bubble cap during film rupture, the flapping of the cap film, and the disintegration of Worthington jets after cavity collapse. We show here that a dominant fraction of previously identified as "surface bubble bursting" submicron drops are, in fact, generated underwater, in the abyss, inside the bubbles themselves before they have reached the surface. Several experimental evidences demonstrate that these drops originate from the flapping instability of the film squeezed between underwater colliding bubbles. This finding, emphasizing the eminent role of bubble-bubble collisions, alters fundamentally our understanding of fine aerosol production and opens a novel perspective for transfers across water-air interfaces.
在过去的一个世纪里，对气泡破裂产生液滴的机制进行了广泛研究。这些机制包括薄膜破裂时气泡帽处液体韧带的离心破碎、帽膜的拍打以及腔室坍塌后沃辛顿射流的解体。我们在此表明，先前被认定为“表面气泡破裂”的亚微米级液滴，实际上有很大一部分是在水下、深渊中、气泡到达水面之前在其内部产生的。多项实验证据表明，这些液滴源自水下碰撞气泡之间挤压的薄膜的拍打不稳定性。这一发现强调了气泡 - 气泡碰撞的突出作用，从根本上改变了我们对细颗粒气溶胶产生的理解，并为跨水 - 气界面的传输开辟了新的视角。
