单液滴撞击超疏水冷表面的反弹及破碎行为

发布时间：2018-04-01 04:28

  本文选题：超疏水　切入点：冷表面　出处：《化工学报》2017年06期

【摘要】：对直径2.8 mm的液滴撞击冷表面的动态行为进行快速可视化观测,对比研究单液滴撞击普通冷表面以及超疏水冷表面的动力学特性,同时对初始撞击速度以及冷表面温度对液滴动态演化行为的影响进行了对比分析。实验结果表明:与液滴撞击普通冷表面(温度-25~-5℃)发生瞬时冻结沉积相比,液滴撞击超疏水冷表面时均未发生冻结,而且伴随铺展、回缩、反弹以及破碎行为;撞击速度越大,普通冷表面上液滴铺展因子越大,而且液滴越易冻结。液滴低速(We≤76)撞击超疏水冷表面会发生反弹现象,但速度对液滴最大铺展时间无影响;液滴高速(We≥115)撞击超疏水冷表面后会产生明显液指,而且破碎为多组卫星液滴。此外,冷表面温度仅影响液滴反弹高度,对液滴最大铺展因子以及液滴铺展时间影响较小。结果表明超疏水表面可显著抑制液滴撞击冷表面的瞬时冻结沉积。
[Abstract]:The dynamic behavior of droplet impinging on cold surface with diameter of 2.8 mm was observed rapidly and visualized, and the dynamic characteristics of single droplet impact on common cold surface and superhydrophobic surface were compared and studied.The effects of the initial impact velocity and the cold surface temperature on the dynamic evolution behavior of the droplet were compared and analyzed.The experimental results show that, compared with the transient freezing deposition of droplets on common cold surfaces (temperature -25 ~ 5 鈩，

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