论文标题
通过表面冷却使超疏水性飞溅
Making superhydrophobic splashes by surface cooling
论文作者
论文摘要
我们通过实验研究由于凝固而增强了飞溅的增强。研究水滴对干燥光滑表面的影响，我们表明，通过冷却液体熔化温度以下的表面可以大大降低飞溅的过渡速度。我们发现，在非常低的温度（低于$ -60 ^\ circ \ rm c $）下，溅起的行为与表面底层底层无关，并且具有与环境温度超疏水表面相同的特征。这种相似之处是由薄片的动态前进的接触角的增加而引起的，表面底层底漆，从等温亲水到超疏水行为。我们建议晶体形成会影响薄片的动态接触角，这将解释这种令人惊讶的过渡。最后，我们表明，从亲水性到超氧化恐惧症行为的过渡也可以在射流的动力学上进行定量表征。
We study experimentally the enhancement of splashing due to solidification. Investigating the impact of water drops on dry smooth surfaces, we show that the transition velocity to splash can be drastically reduced by cooling the surface below the liquid melting temperature. We find that at very low temperatures (below $-60 ^\circ \rm C$), the splashing behaviour becomes independent of surface undercooling and presents the same characteristics as on ambient temperature superhydrophobic surfaces. This resemblance arises from an increase of the dynamic advancing contact angle of the lamella with surface undercooling, going from the isothermal hydrophilic to the superhydrophobic behaviour. We propose that crystal formation can affect the dynamic contact angle of the lamella, which would explain this surprising transition. Finally, we show that the transition from hydrophilic to superydrophobic behaviour can also be characterized quantitatively on the dynamics of the ejecta.
