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The Statistical Analysis of Droplet Train Splashing After Impinging on a Superheated Surface

机译：水滴撞击过热表面后飞溅的统计分析

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摘要

An orderly droplet splashing is established when a water droplet train impinges onto a superheated copper surface. The droplets continuously impinge onto the surface with a rate of 40,000Hz, a diameter of96 μm or 120 μm, and a velocity of 8.4m/s or 14.5m/s. The heat transfers under different wall temperatures are measured, and the corresponding droplet splashing is recorded and analyzed. The effects of wall temperature, droplet Weber number, and surface roughness on the transition of the droplet splashing are investigated. The results suggest that the transferred energy is kept a constant in the transition regime, but a sudden drop of around 25% is observed when it steps into post-transition regime, indicating that the Leidenfrost point is reached. A higher Weber number of droplet train results in a more stable splashing angle and a wider range of splashed droplet diameter. The surface roughness plays no significant role in influencing the splashing angle in the high Weber number case, but the rougher surface elevates the fluctuation of the splashing angle in the low Weber number case. On the rougher surface, the temporary accumulation of the impact droplets is observed, a "huge" secondary droplet can be formed and released. The continuous generation of the huge droplets is observed at a higher wall temperature. Based on the result of droplet tracking of the splashed secondary droplets, the diameter and velocity are correlated.
机译：当水滴列撞击到过热的铜表面上时，将形成有序的水滴飞溅。液滴以40,000Hz的速度，96μm或120μm的直径和8.4m / s或14.5m / s的速度连续撞击表面。测量在不同壁温下的热传递，并记录和分析相应的液滴飞溅。研究了壁温，液滴韦伯数和表面粗糙度对液滴飞溅过渡的影响。结果表明，转移的能量在过渡态中保持恒定，但是当进入过渡后态时，观察到突然下降约25％，表明达到了莱顿弗罗斯特点。较高的液滴序列韦伯数会导致更稳定的飞溅角和更大范围的飞溅液滴直径。在高韦伯数情况下，表面粗糙度对影响飞溅角没有重要作用，但在低韦伯数情况下，表面较粗糙会增加飞溅角的波动。在较粗糙的表面上，观察到冲击液滴的暂时积累，可以形成和释放“巨大的”次级液滴。在较高的壁温下观察到巨大液滴的连续产生。基于飞溅的次级液滴的液滴跟踪结果，可以将直径和速度关联起来。

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  • 来源
    《Journal of Heat Transfer》 |2017年第5期|052201.1-052201.8|共8页
  • 作者

    Fei Duan; Lu Qiu; Swapnil Dubey; Fook Hoong Choo;

  • 作者单位

    School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

    Energy Research Institute @ NTU, Nanyang Technological University, 1 Cleantech Loop, 06-04 Cleantech One, Singapore 637141, Singapore;

    Energy Research Institute @ NTU, Nanyang Technological University, 1 Cleantech Loop, 06-04 Cleantech One, Singapore 637141, Singapore;

    Energy Research Institute @ NTU, Nanyang Technological University, 1 Cleantech Loop, 06-04 Cleantech One, Singapore 637141, Singapore;

  • 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
  • 中图分类
  • 关键词

    bubbles; particles; droplets;

    机译：气泡;颗粒;液滴;

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