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首页> 外文期刊>Journal of Heat Transfer >Flow Field Inside a Sessile Droplet on a Hydrophobic Surface in Relation to Self Cleaning Applications of Dust Particles
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Flow Field Inside a Sessile Droplet on a Hydrophobic Surface in Relation to Self Cleaning Applications of Dust Particles

机译：疏水性表面上无滴液滴内部的流场与灰尘颗粒的自清洁应用有关

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摘要

Internal fluidity of a sessile droplet on a hydrophobic surface and dynamics of fine size dust particles in the droplet interior are examined for various droplet contact angles. The geometric features of the droplet incorporated in the simulations resemble the actual droplet geometry of the experiments, and simulation conditions are set in line with the experimental conditions. The dust particles are analyzed, and the surface tension of the fluid, which composes of the dust particles and water, is measured and incorporated in the analysis. Particle tracking method is adopted experimentally to validate the numerical predictions of the flow field. It is found that heat transfer from the hydrophobic surface to the droplet gives rise to the formation of two counter rotating cells inside the droplet. The Nusselt and the Bond numbers increase with increasing droplet contact angle. The number of dust particles crossing over the horizontal rake, which corresponds to the top surface of the dust particles settled in the droplet bottom, toward the droplet interior increases as the particle density reduces, which is more pronounced in the early period. Experimental findings of flow velocity well agree with its counterparts obtained from the simulations.
机译：对于各种液滴接触角，检查了无水液滴在疏水性表面上的内部流动性和液滴内部的细小尘粒动力学。包含在模拟中的液滴的几何特征类似于实验的实际液滴几何形状，并且模拟条件是根据实验条件设置的。分析灰尘颗粒，并测量由灰尘颗粒和水组成的流体的表面张力，并将其纳入分析。实验上采用了粒子跟踪方法来验证流场的数值预测。发现从疏水表面到液滴的热传递导致在液滴内部形成两个反向旋转的小室。随着液滴接触角的增加，Nusselt和Bond数增加。随着颗粒密度的减小，越过水平耙的尘埃颗粒的数量越多，该水平耙子对应于沉降在微滴底部的尘埃颗粒的顶表面，朝向尘埃内部增加，这在早期尤为明显。流速的实验结果与从模拟中获得的结果非常吻合。

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  • 来源
    《Journal of Heat Transfer》 |2017年第4期|042003.1-042003.16|共16页
  • 作者

    Abdullah Al-Sharafi; Bekir S. Yilbas; Ahmet Z. Sahin; H. Ali;

  • 作者单位

    Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;

    Department of Mechanical Engineering, Centre of Excellence for Renewable Energy, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;

    Department of Mechanical Engineering, Centre of Excellence for Renewable Energy, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;

    Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;

  • 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; heat transfer; dust particles; Marangoni; buoyancy; Brownian; bond number;

    机译：水滴;传播热量;尘粒;马兰戈尼浮力;布朗债券编号;

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