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Experimental and Numerical Visualization of Droplet-Induced Crown Splashing Dynamics

机译：液滴诱导冠飞溅动力学的实验和数值可视化

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摘要

The objective of this study was to visualize the droplet-induced crown splashing dynamics at high spatial and temporal resolutions. In this work, the effects of droplet train impingement on crown splashing dynamics were investigated experimentally and numerically. Experimentally, a HFE-7100 droplet train was produced using a piezo-electric droplet generator at a frequency (f) of 7500 Hz resulting in a droplet Weber number (We) of 489. Droplet-induced crown splashing dynamics was captured using a high-speed imaging system. It was observed that the free rim of the droplet-induced crown was smooth and axisymmetric during the early crown propagation phases (t~*< 5, where t~* = 2πft). However, development of cusps was observed on the free rim during the intermediate phases (5< t~* <8.5). It was found that the sites of the spikes distributed almost uniformly along the periphery of the free rim. At late phases (t~* > 8.5), fingering, detachment and secondary droplets (i.e. splashing) were observed on the free rim. Results show that the number of cusps (finally becoming fingers and spikes) based on experiments (n_(cups,exp)) agrees well with the prediction (n_(cups,th)) given by the Plateau-Rayleigh instability theory. Numerical simulations were carried out using a 3D transient coupled level set-volume of fluid (CLSVOF) solver with Courant number less than 1. A grid independence study was performed to ensure the results were independent of grid size. Reasonable agreement was reached between the numerical and experimental data in terms of crown morphology at different phases. This study should lead to a better understanding of the evolution of droplet-induced crown morphology at splashing conditions.
机译：这项研究的目的是在高空间和时间分辨率下可视化液滴诱导的冠飞溅动力学。在这项工作中，通过实验和数值研究了液滴列撞击对冠飞溅动力学的影响。实验上，使用压电液滴发生器以7500 Hz的频率（f）产生了HFE-7100液滴流，产生的液滴Weber数（We）为489。速度成像系统。观察到，在早期冠传播阶段（t〜* <5，其中t〜* =2πft），液滴诱导的冠的自由边缘是光滑且轴对称的。但是，在中间阶段（5

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  • 来源
    《Journal of Heat Transfer》 |2017年第2期|020909.1-020909.1|共1页
  • 作者

    Taolue Zhang; J. P. Muthusamy; Jorge Alvarado; Anoop Kanjirakat; Reza Sadr;

  • 作者单位

    Texas A&M University, College Station, Texas, USA;

    Texas A&M University, College Station, Texas, USA;

    Texas A&M University, College Station, Texas, USA;

    Texas A&M University at Qatar, Education City, Doha, Qatar;

    Texas A&M University at Qatar, Education City, Doha, Qatar;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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