Experimental study on flow fields and bubble entrainments by the water droplet impact using 3D PIV tests

IF 1.7 3区工程技术 Q3 ENGINEERING, CIVIL

Journal of Hydraulic Research Pub Date : 2023-05-04 DOI:10.1080/00221686.2023.2201357

Xun Han, Wang-ru Wei, P. Lin, Jun Deng, Wei-lin Xu

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Abstract

The phenomenon of a water droplet impact on a free surface is studied to understand the physics of free surface bubble entrainment. Particle image velocimetry (PIV) and high-speed image system are used to analyse the flow structure evolutions in the droplet impact cavity period and bubble entrainment cavity period, respectively. The photographic results show that the entrapped surface of the impact cavity remains intact and continuous, and individual bubble entrainment occurs during the secondary entrainment cavity evolution. The instantaneous distributions of velocity fields in the longitudinal and lateral directions are uniform and independent of the approaching impact velocity. For the entrainment cavity evolution, the transverse diffusion intensity is higher than that for the impact cavity period. An individual bubble forms during the transverse velocity penetration across the droplet impact area. Consequently, for the droplet impact on a water surface, the present study implies the presence of a mechanism by which the interior flow field plays a key role in the bubble entrainment.

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基于三维PIV试验的水滴冲击流场及气泡夹带实验研究

研究了水滴撞击自由表面的现象，以了解自由表面气泡夹带的物理性质。利用粒子图像测速仪（PIV）和高速成像系统分别分析了液滴撞击空腔和气泡夹带空腔两个阶段的流动结构演变。摄影结果表明，撞击腔的截留表面保持完整和连续，在二次夹带腔演化过程中发生了单个气泡夹带。速度场在纵向和横向上的瞬时分布是均匀的，并且与接近的冲击速度无关。对于夹带空腔的演变，横向扩散强度高于冲击空腔时期的横向扩散强度。单个气泡在液滴撞击区域的横向速度穿透过程中形成。因此，对于液滴在水面上的冲击，本研究暗示了内部流场在气泡夹带中起关键作用的机制的存在。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydraulic Research 工程技术-工程：土木

CiteScore

4.90

自引率

4.30%

发文量

审稿时长

6.6 months

期刊介绍： The Journal of Hydraulic Research (JHR) is the flagship journal of the International Association for Hydro-Environment Engineering and Research (IAHR). It publishes research papers in theoretical, experimental and computational hydraulics and fluid mechanics, particularly relating to rivers, lakes, estuaries, coasts, constructed waterways, and some internal flows such as pipe flows. To reflect current tendencies in water research, outcomes of interdisciplinary hydro-environment studies with a strong fluid mechanical component are especially invited. Although the preference is given to the fundamental issues, the papers focusing on important unconventional or emerging applications of broad interest are also welcome.