Thermal atomization on superhydrophobic surfaces of varying temperature jump length
Thermal atomization on superhydrophobic surfaces of varying temperature jump length
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DOI：
10.1016/j.ijheatmasstransfer.2023.124587
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发表时间：
2023
影响因子：
5.2
通讯作者：
Eric D. Lee;Daniel Maynes;J. Crockett;Brian D. Iverson
中科院分区：
文献类型：
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作者：
Eric D. Lee;Daniel Maynes;J. Crockett;Brian D. Iverson
本文对液滴在疏水和超疏水表面的撞击和热雾化进行了实验研究。被认为是具有微米级和纳米级几何形状的超疏水表面。微尺度SH表面涂覆有疏水性涂层，并表现出微柱和空腔，其使用表面固体分数和中心到中心的间距进行分类。本研究中探索的固相分数和沥青值分别为0.05-1.0和8-60 μm。纳米级纹理表面是通过应用碳纳米管的覆盖层来创建的。这两种类型的表面通过温度跳跃长度（λ T）进一步分类。所有实验均在We= 85下进行。作为时间的函数的冲击事件的雾化结果提供了不同的表面几何形状，表面温度和温度跳跃长度的几个表面。纳米级SH表面显示出在所有探索条件下完全抑制雾化。在给定表面上发生的最大雾化的结果也显示为表面温度的函数。最大雾化发生时的表面温度随表面几何形状而变化。此外，当发生最大雾化时，撞击后的时间也是SH表面参数的函数。一般情况下，最大原子化幅度和最大原子化发生时的表面温度均随λ T的增大而减小。此外，最大雾化发生的时间随着λ T的增加而增加。
This paper presents an experimental study of drop impingement and thermal atomization on hydrophobic and superhydrophobic (SH) surfaces. Superhydrophobic surfaces having both microscale and nanoscale geometry are considered. Microscale SH surfaces are coated with a hydrophobic coating and exhibit micropillars and cavities which are classified using the surface solid fraction and center to center pitch. The solid fraction and pitch values explored in this study range from 0.05-1.0 and 8-60 μm respectively. Nanoscale textured surfaces are created by applying a blanket layer of carbon nanotubes. Both types of surfaces are further classified by a temperature jump length (λ T). All experiments were conducted at We= 85. Results of atomization as a function of time for the impingement event are provided for several surfaces of varying surface geometry, surface temperature, and temperature jump length. Nanoscale SH surfaces are shown to completely suppress atomization at all conditions explored. Results of the maximum atomization that occurred on a given surface are also shown as a function of the surface temperature. The surface temperature at which the maximum atomization occurs varies with surface geometry. Further, the time after impact when the maximum atomization occurs is also a function of the SH surface parameters. In general, the maximum atomization magnitude and the surface temperature at which maximum atomization occurs each decrease with increasing λ T. Further, the time when maximum atomization occurs increases with increasing λ T.