Curvature suppresses the Rayleigh-Taylor instability
Curvature suppresses the Rayleigh-Taylor instability
复制标题
曲率抑制瑞利-泰勒不稳定性
DOI：
10.1063/1.4876476
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发表时间：
2014
影响因子：
4.6
通讯作者：
H. Stone
中科院分区：
文献类型：
--
作者：
Philippe H. Trinh;Hyoungsoo Kim;N. Hammoud;P. Howell;S. Chapman;H. Stone
研究了弯曲圆柱形衬底上液体薄膜的动力学特性。研究了液层随膜厚和基底曲率半径变化的演化过程。确定了一个包含几何参数、重力和表面张力的无量纲参数（修改的键数），并允许根据三种不同的流动状态对观察结果进行分类：稳定膜、扰动瞬态增长随后衰减的膜和不稳定膜。实验和线性稳定性理论证实，在键数的临界值以下，基底的曲率抑制瑞利-泰勒不稳定性。
The dynamics of a thin liquid film on the underside of a curved cylindrical substrate is studied. The evolution of the liquid layer is investigated as the film thickness and the radius of curvature of the substrate are varied. A dimensionless parameter (a modified Bond number) that incorporates both geometric parameters, gravity, and surface tension is identified, and allows the observations to be classified according to three different flow regimes: stable films, films with transient growth of perturbations followed by decay, and unstable films. Experiments and linear stability theory confirm that below a critical value of the Bond number curvature of the substrate suppresses the Rayleigh-Taylor instability.