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Temporal and spatial evolution of the thin film near triple line during droplet evaporation

机译：液滴蒸发过程中三线附近薄膜的时空演化

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摘要

The evaporation process of the thin film region near the triple line for a liquid suspended with nanopar-ticles involves important interfacial phenomena such as contact line movement, deposition, and evaporation. In this paper, droplets that are seeded with fluorescent nanoparticles of different diameters and of the same particle numbers were investigated for their evaporation rates, deposition patterns, and in-plane average velocities within the field-of-view. The results present different modes of deposition patterns for the fluorescent nanoparticles, and stronger evaporation can be obtained using nanoparticles of small diameter. The temporal and spatial evolution of velocities and thicknesses in the thin films near the triple lines during the droplet evaporation were obtained by using a proposed sub-region method, which is developed from an evanescent wave based nanoparticle image velocimetry technique. It shows that, depending on the nanoparticle size, the spatial variation of the local thin film thickness can be linear or nonlinear. The fluorescent nanoparticles can affect the evaporation modes, the internal flow, and the temporal and spatial evolution of the thin film during the droplet evaporation through the interaction between the particles and the interface near the contact line and their influence on the change of the microscopic contact angle during the pinning process of the contact line. This work can help capture insights on how nanosized particles affect the droplet evaporation near the triple line.
机译：悬浮在纳米颗粒中的液体在三线附近的薄膜区域的蒸发过程涉及重要的界面现象，例如接触线移动，沉积和蒸发。在本文中，研究了用不同直径和相同粒子数量的荧光纳米粒子播种的液滴的蒸发速率，沉积模式和在视场内的平面内平均速度。结果显示了荧光纳米颗粒的沉积模式的不同模式，使用小直径的纳米颗粒可以获得更强的蒸发。通过使用基于sub逝波的纳米粒子图像测速技术开发的拟议子区域方法，获得了液滴蒸发过程中三线附近薄膜中速度和厚度的时空变化。结果表明，取决于纳米颗粒的尺寸，局部薄膜厚度的空间变化可以是线性的或非线性的。荧光纳米粒子可通过粒子与接触线附近界面之间的相互作用及其对微观接触变化的影响，影响液滴蒸发过程中薄膜的蒸发模式，内部流动以及薄膜的时空演化。接触线固定过程中的角度。这项工作可以帮助您了解纳米颗粒如何影响三线附近的液滴蒸发。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第2期|1147-1157|共11页
  • 作者

    Leping Zhou; Yang Yang; Shengsheng Yin; Xiaoze Du; Yongping Yang;

  • 作者单位

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;

    Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;

  • 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

    Droplet; Evaporation; Thin film; Thickness; Triple line;

    机译：水滴;蒸发;薄膜;厚度;三重线;

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