The Saturnian droplet
The Saturnian droplet
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土星水滴
DOI：
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发表时间：
2020
影响因子：
3.7
通讯作者：
A. Marin
中科院分区：
文献类型：
--
作者：
A. Marin
摘要液体界面的电流体动力学不稳定性继续违背我们的直觉，从泰勒的开创性工作（Proc. R。Soc. Lond. A，vol. 280，issue 1382，1964，pp. 383-397）到最近瓦戈纳（Wagoner）等人的数值研究（J.FluidMech.，第904卷，2020，R4）。瓦戈纳等人（2020）研究的问题包括在强电场中浸入导电性更强且介电性更强的液体介质中的液滴。当液滴比外部介质更粘稠时，液滴形成双凹形状，其最终可能演变成圆环形状（或甜甜圈）。相比之下，当液滴粘度较低时，它采用透镜状形状并从其赤道发射薄流体片，该薄流体片继而分解成液滴。这些小滴在原来的小滴周围形成了一个卫星环，这证明了它被称为“土星小滴”。数值模拟揭示了这种复杂现象，并证实了漏电介质框架的鲁棒性（Melcher & Taylor，Annu. Rev. Fluid Mech.，第1卷，1969年，第100页。第111-146段）。
Abstract Electrohydrodynamic instabilities at liquid interfaces continue to defy our intuition, from the pioneering work of Taylor (Proc. R. Soc. Lond. A, vol. 280, issue 1382, 1964, pp. 383–397) on conical tips of electrified droplets to a recent numerical study by Wagoner et al. (J. Fluid Mech., vol. 904, 2020, R4). The problem studied by Wagoner et al. (2020) consists of a droplet immersed in a more conducting and more dielectric liquid medium, in a strong electrical field. When the droplet is more viscous than the outer medium, the droplet develops a biconcave shape which might eventually evolve to a torus shape (or doughnut). In contrast, when the droplet is less viscous, it adopts a lenticular shape and emits a thin fluid sheet from its equator which in turn breaks up into droplets. These droplets form a ring of satellites around the original droplet, which justifies its appellation ‘Saturnian droplet’. The numerical simulations bring light to this complex phenomenon and confirm the robustness of the leaky-dielectric framework (Melcher & Taylor, Annu. Rev. Fluid Mech., vol. 1, 1969, pp. 111–146).