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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of insoluble nano-particles on nanofluid droplet evaporation
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Effects of insoluble nano-particles on nanofluid droplet evaporation

机译：不溶性纳米颗粒对纳米流体液滴蒸发的影响

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摘要

A model is presented for predicting the evaporation behavior of liquid droplets containing nano-sized insoluble particles. The model is constructed based on, and supported by, the existing experimental result. Of particular interest are the evolution of droplet size, and evaporation rate constant prior to the shell formation (also called the first drying or evaporation stage), when the particles forms a compact shell at the droplet surface. As the droplet evaporation proceeds, increasingly more particles are "included" on its surface, reducing the effective liquid surface area for evaporation causing deviation from the classical d~2-law for pure fluid droplet evaporation. Peclet number (Pe), a non-dimensional ratio of particle diffusion time to the droplet lifetime, and initial particle concentration (Y_(vo)) are shown to play a role in the evaporation behavior prior to shell formation. The model predicts that: (1) the deviation from the classical d~2-law is increasingly significant with increased Pe and Y_(vo); (2) the time to shell formation decreases, and shell diameter increases, with increased Pe and initial particle concentration (Y_(vo)). As a consequence, Y_(vo) • Pe ＜ 1.8 is necessary for the first stage to exist at all. Within the limiting value, the combination of larger Pe and smaller Y_(vo) produces larger hollow shells with low densities. For Y_(vo) • Pe ＞ 1.8 the shell forms instantly and evaporation occurs after liquid diffuses through, and wet, the shell. The effect of contact angle (θ) on the effective liquid surface area for evaporation is also discussed.
机译：提出了用于预测包含纳米级不溶颗粒的液滴的蒸发行为的模型。该模型基于现有实验结果构建并得到其支持。当颗粒在液滴表面形成致密壳时，特别令人关注的是液滴尺寸的演变以及在壳形成之前的蒸发速率常数（也称为第一干燥或蒸发阶段）。随着液滴蒸发的进行，越来越多的颗粒被“包含”在其表面上，从而减小了有效的蒸发液体表面积，从而导致偏离了经典的纯流体液滴蒸发的d-2律。在壳体形成之前，Peclet数（Pe），粒子扩散时间与液滴寿命的无量纲比以及初始粒子浓度（Y_（vo））在蒸发行为中起着作用。该模型预测：（1）随着Pe和Y_（vo）的增加，与经典d〜2律的偏差越来越大； （2）随着Pe和初始颗粒浓度（Y_（vo））的增加，壳形成的时间减少，壳直径增加。因此，第一阶段必须存在Y_（vo）•Pe ＜1.8。在极限值内，较大的Pe和较小的Y_（vo）的组合将产生较大的低密度空心壳。当Y_（vo）•Pe＞ 1.8时，壳即刻形成，在液体扩散并润湿壳后会发生蒸发。还讨论了接触角（θ）对有效蒸发液体表面积的影响。

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  • 作者

    Yan Wei; Weiwei Deng; Ruey-Hung Chen;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, United States;

    Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 25061, United States;

    Department of Mechanical and Aerospace Engineering, New Mexico State University, Las Cruces, NM 88003, United States;

  • 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

    Evaporation; Nanofluid; Nano-particles; Peclet number; d~2-Law;

    机译：蒸发;纳米流体纳米颗粒;Peclet号;d〜2-法;

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