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首页> 外文期刊>Journal of Fluids Engineering: Transactions of the ASME >Experimental and Model Studies of Various Size Water Droplet Impacting on a Hydrophobic Surface
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Experimental and Model Studies of Various Size Water Droplet Impacting on a Hydrophobic Surface

机译：各种尺寸水滴冲击疏水表面的实验和模型研究

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摘要

Impacting droplet on a hydrophobic surface is investigated and droplet size effect on impacting properties is examined. Liquid pressure variation inside droplet is numerically simulated in the impacting and rebounding periods. Droplet motion on impacted hydrophobic surface is monitored using a high-speed recording system. We showed that predictions and high-speed data for droplet shape and geometric features appear to be almost identical in the spreading and retraction of the droplet on sample surface. Increased volume of droplet gives rise to the peak pressure enhancement in droplet liquid during impact. The maximum droplet height remains larger for large volume droplets in both spreading and retraction cycles. Increasing size of droplet enlarges the wetting diameter on the impacted surface during droplet deformation on sample surfaces. The rate of peak velocity of the spreading surface of the droplet is faster for larger droplets as compared to that corresponding to small droplets. The ratio of spreading period over the retraction period of the droplet becomes small for droplets with small size.
机译：研究了液滴在疏水表面上的碰撞，并考察了液滴尺寸对碰撞性能的影响。数值模拟了液滴在撞击和反弹过程中液滴内部的压力变化。液滴在受撞击的疏水表面上的运动通过高速记录系统进行监测。我们发现，关于液滴形状和几何特征的预测和高速数据在样品表面上的液滴扩展和收缩方面似乎几乎相同。在撞击过程中，液滴体积的增加会导致液滴中的峰值压力增加。在扩散和收缩循环中，大体积液滴的最大液滴高度保持较大。在试样表面的液滴变形过程中，液滴尺寸的增大增大了受冲击表面上的润湿直径。与对应于小液滴的速度相比，较大液滴的液滴扩展表面的峰值速度更快。对于小尺寸的液滴，液滴的扩散期与收缩期之比变小。

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