Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films.
Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films.
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DOI：
10.3791/57865
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发表时间：
2018-08-18
期刊：
影响因子：
--
通讯作者：
Matar OK
中科院分区：
文献类型：
--
作者：
Adebayo IT;Matar OK
液滴撞击是自然界中一种非常普遍的现象，由于其美学魅力和广泛的应用而引起人们的关注。以往关于流动液膜的研究忽略了波的空间结构对碰撞结果的贡献，而最近的研究表明这对液滴碰撞动力学有重要的影响。在这份报告中，我们概述了一个循序渐进的过程来研究流动液膜的周期性入口强迫导致时空规则波结构的产生对液滴碰撞动力学的影响。与电磁阀连接的函数发生器被用来激励薄膜表面上的这些时空规则的波结构，而均匀尺寸的液滴的冲击动力学则被高速摄像机捕捉到。然后研究了三个不同的区域：即。大波峰之前的毛细波区、平膜区和波峰区。文中还考察了气膜流量、液滴速度和液滴尺寸等重要的无量纲量对气膜雷诺数、液滴韦伯数和奥尼索尔数的影响。我们的结果显示了有趣的、迄今未被发现的动力学，它是在低惯量和大惯量的情况下，对流动的油膜施加油膜入口力。
Droplet impact is a very common phenomenon in nature and attracts attention due to its aesthetic fascination and wide-ranging applications. Previous studies on flowing liquid films have neglected the contributions of spatial structures of waves to the impact outcome, while this has recently been shown to have a significant influence on the drop impact dynamics. In this report, we outline a step-by-step procedure to investigate the effect of periodic inlet forcing of a flowing liquid film leading to the production of spatiotemporally regular wave structures on drop impact dynamics. A function generator in connection with a solenoid valve is used to excite these spatiotemporally regular wave structures on the film surface while the impact dynamics of uniform-sized droplets are captured using a high-speed camera. Three distinct regions are then studied; viz. the capillary wave region preceding the large wave peak, the flat film region, and the wave hump region. The effects of important dimensionless quantities such as film Reynolds, drop Weber and Ohnesorge numbers parameterized by the film flow rate, drop speed, and drop size are also examined. Our results show interesting, hitherto undiscovered dynamics brought about by this application of film inlet forcing of the flowing film for both low and high inertia drops.
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影响因子：
3.7
作者：
BENJAMIN, TB
通讯作者：
BENJAMIN, TB
影响因子：
56.9
作者：
HOBBS, PV;OSHEROFF, T
通讯作者：
OSHEROFF, T
影响因子：
2.4
作者：
Royer, John R.;Corwin, Eric I.;Jaeger, Heinrich M.
通讯作者：
Jaeger, Heinrich M.
影响因子：
4.6
作者：
Wang, AB;Chen, CC
通讯作者：
Chen, CC
DOI：
10.1073/pnas.1111060109
发表时间：
2012-03-20
影响因子：
11.1
作者：
Miskin, Marc Z.;Jaeger, Heinrich M.
通讯作者：
Jaeger, Heinrich M.