Abstract
The chemically striped surface contains both hydrophilic and super-hydrophobic stripes. During the droplet spreading on the striped surface, the inconsistent retraction of liquids on hydrophilic stripes and super-hydrophobic stripes causes the droplet to split out satellite droplets. The generation of the satellite droplet can significantly increase the liquid-solid contact area and the length of the three-phase contact line. The increase of the contact line length broadens the range of higher heat flux, and the rise of the contact area enlarges the heat transfer area. Therefore, the chemically striped surface can promote droplet evaporation and increase the heat transfer 41.51 % higher than the hydrophilic surface. Due to different sizes, the satellite droplets enter the CCA evaporation mode earlier than the main droplet. Therefore, the droplet will experience a CCR−CCA mixed mode. During this mode, the contact line length and contact area will decrease rapidly. The satellite droplets on the chemical surface with thinner stripes are smaller than those on the chemical surface with wider stripes, leading the droplet on the former surface to enter the CCR−CCA mixed mode earlier than the droplet on the latter surface. Therefore, the lifetime of droplets on the chemical surface with wider stripes is shorter than that of droplets on the chemical surface with thinner stripes. Besides, the lower impact velocity is not conducive to droplet splitting and, therefore, evaporation.
Published Version
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