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Bouncing to Merging Transition in Drop Impact on Liquid Film: Role of Viscosity

机译：在液体膜上施加液滴的转型来蹦蹦跳跳：粘度的作用

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Fuels sprayed inside IC-engines can impact the internal surfaces and thus obviates the purpose of atomization. Furthermore, the subsequent film gasification also constitutes a completely different mode of fuel gasification that could fundamentally affect the fuel/air mixing and combustion processes. The accumulation and growth of the film depends on the outcome of subsequent drop impact on the initially formed film, and as such controlling the outcome of the impact is critical for engine operation. In our recent study (Tang, et al. Soft Matter 2016), we presented a regime diagram based on the Weber number We (ratio of impact inertia and surface tension) and the film thickness, delineating the bouncing and merging operating conditions and providing scaling for the transition boundaries of a single liquid (C14 alkane). Since liquid viscosity is a critical fluid property that fundamentally affects the impact outcome, through its influence on the fluid motion and viscous dissipation of the impact inertia, here we extend the study for liquids from C10 to C17 alkanes, covering a wide range of viscosity, to assess its effect on the regime diagram. Results show that while the regime diagram maintains its general structure, the bouncing regime becomes smaller for less viscous liquids. Consequently viscous effects are modeled and a modified scaling is proposed. This new scaling attempts to unify all liquids and provide a useful tool to manipulate the outcome of drop impact on liquid film.
机译：喷涂内部的燃料可以影响内表面，从而消除雾化的目的。此外，随后的薄膜气化也构成了完全不同的燃料气化模式，其可以从根本上影响燃料/空气混合和燃烧过程。薄膜的积累和生长取决于随后对最初形成的薄膜的造成的结果的结果，并且因此控制影响的结果对于发动机操作至关重要。在我们最近的一项研究中（Tang，等人软件2016），我们基于Weber号码（碰撞惯性和表面张力的比率）和薄膜厚度，绘制了弹跳和合并操作条件并提供缩放的制度图对于单液（C14烷烃）的过渡边界。由于液体粘度是一种临界流体性能，从根本上产生影响结果，通过其对撞击惯量的流体运动和粘性耗散的影响，我们在这里将研究延伸到C10至C17烷烃的液体，覆盖各种粘度，评估其对政纲图的影响。结果表明，虽然政权图保持其一般结构，但粘性的液体变小变小。因此，建模粘性效果，提出了修改的缩放。这种新的缩放尝试统一所有液体，并提供一种有用的工具，以操纵液体膜的液滴的结果。

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