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Vorticity effects in drop impact

Vorticity effects in drop impact

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第九届全国流体力学学术会议

作者： Marie-Jean tHORAVAL sigurdur t.thoroddsen International Center for Applied Mechanics State Key Laboratory for Strength and Vibration of Mechanical StructuresXi'an Jiaotong University Division of Physical Sciences and Engineering & Clean Combustion Research Center King Abdullah University of Science and Technology(KAUST)

the impact of drop on a liquid pool can entrap bubbles and splash smaller *** bubbles can dissolve and transfer gas into the pool,while the droplets can generate *** studies on drop impacts have neglected the effect of vorticity on the *** were able to reproduce the large scale dynamics of the drop entering the ***,recent results have demonstrated that the vorticity produced at the air-liquid interface plays a critical role in explaining the complex dynamics of splashing and air *** focus here on the dynamics of the air bubble entrapped just after contact between the drop and the *** show the role of vorticity in producing a large range of different bubble shape,including toroidal bubbles,and bubbles containing a liquid droplet

关键词： Drop impact Air Entrapment Splashing Vorticity Vortex Ring

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液滴撞击液池所致被捕获空气盘的动力学研究

液滴撞击液池所致被捕获空气盘的动力学研究

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第十一届全国流体力学学术会议

作者：菅振 Murad Ali Channa Abderrahmane Kherbeche Hossain Chizari sigurdur t.thoroddsen Marie-Jean thoraval 西安交通大学航天航空学院机械结构强度与振动国家重点实验室国际应用力学中心 Division of Physical Sciences and Engineering King Abdullah University of Science and Technology(KAUST)

液滴撞击液池过程中,一定量空气在液滴与液池间被捕获并形成空气圆盘,最终收缩为中心气泡。本文采用高速摄像实验技术和高精度数值模拟研究不同物性和撞击条件下,被捕获空气圆盘的收缩过程。揭示了被捕获空气圆盘收缩为中心气泡的动力... 详细信息

液滴撞击液池过程中,一定量空气在液滴与液池间被捕获并形成空气圆盘,最终收缩为中心气泡。本文采用高速摄像实验技术和高精度数值模拟研究不同物性和撞击条件下,被捕获空气圆盘的收缩过程。揭示了被捕获空气圆盘收缩为中心气泡的动力学过程,发现了生成单一气泡、生成环状气泡、垂直分裂为两个子气泡等空气盘收缩的不同模态;定义了基于被捕获空气层平均厚度的局部Ohnesorge数Ohe,构建了基于Re数和We数的模态演化参数空间,建立了基于Ohe数的被捕获空气圆盘不同收缩模态间相互转化的无量纲标度率;提出了气泡垂直分裂的机理解释,发现对于低Ohe数的情况,被捕获空气层收缩过程中产生的涡脱落现象能阻止气泡的垂直分裂,并使气泡沿液滴撞击反方向上升或对抗浮力下降。

关键词：液滴撞击气泡气体捕获空气盘涡脱落

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Large Bubble Entrainment in Drop Impact on a Pool

Large Bubble Entrainment in Drop Impact on a Pool

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第十四届全国物理力学学术会议

作者： tHORAVAL Marie-Jean LI Yang-Fan thoroddsen sigurdur t International Center for Applied Mechanics State Key Laboratory for Strength and Vibration of Mechanical StructuresXi'an Jiaotong University Mechanical Engineering National University of Singapore Division of Physical Sciences and Engineering & Clean Combustion Research Center King Abdullah University of Science and Technology(KAUST)

A drop impacting onto a pool of the same liquid can entrap air bubbles in many different ways.A peculiar entrapment was observed by Pumphrey and Elmore and remained unexplained until *** a small range of *** cavity produced by the impacting drop spreads radially in a dish-shape and then closes to entrap a bubble larger than the *** demonstrate that this large bubble entrapment is caused by a vortex ring produced at the highly curved air-liquid interface during the impact of the *** combine experiments and numerical simulations to show that the vortex ring pulls on the interface on the side of the cavity to stretch it radially,explaining the shape of the *** show that this type of bubble entrapment is only observed for prolate drops,*** elongated.A strong vortex ring is necessary to produce the large bubble entrapment,as a stronger vortex ring will lead to a stronger pulling on the ***,the strength of the vortex ring is not enough to explain the large bubble ***,flatter drops produce a stronger vortex ring,but do not entrap a large *** that case,the stronger vortex ring interacts strongly with the pool surface and self-destruct earlier,before being able to deform the cavity below the pool *** the strength of the vortex ring,its dynamics also plays a critical role in the large bubble *** dynamics of the vortex ring and its distance to the interface are strongly affected by the shape of the drop,explaining why the large bubble entrapment can be observed only for prolate *** observations also explain why the strongest and most penetrating vortex rings emerging from drop impacts are not produced by oblate drops but by more prolate drop shapes,as had been observed in previous *** regular bubble entrapment is caused by the hydrostatic pressure due to *** can be verified easily by removing gravity in the numerical *** is not the case for

关键词： insulating engineering ceramics electrical discharge machining temperature gradient thermal stress numerical simulation

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