Effect of micro-nano structure on anti-frost and defrost performance of the superhydrophobic fin surfaces
Effect of micro-nano structure on anti-frost and defrost performance of the superhydrophobic fin surfaces
复制标题
微纳结构对超疏水翅片表面防霜和防粘性能的影响
DOI：
10.1016/j.expthermflusci.2023.110878
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发表时间：
2023-02
影响因子：
3.2
通讯作者：
Hui He;Ning Lyu;Caihua Liang;F. Wang;Xiaosong Zhang
中科院分区：
文献类型：
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作者：
Hui He;Ning Lyu;Caihua Liang;F. Wang;Xiaosong Zhang
为了研究纳米结构对微纳结构对热泵超疏水翅片表面抑霜和除霜性能的影响，采用简单的喷涂方法制备了静态接触角和滚动角相同但微纳结构不同的表面。研究表明，随着纳米结构密度的增加，超疏水表面的防霜能力可以有效提高。在凝聚过程中，与低密度纳米结构的微纳结构表面相比，高密度纳米结构表面的凝聚液滴具有更新率高、平均尺寸小、覆盖率低的特点。冷凝32 min时，纳米结构表面凝聚、弹跳、滑动的冷凝液滴数量比微纳结构表面增加47.5%，液滴面积覆盖率比微纳结构表面减少25.46%。在结霜实验中，微纳结构超疏水表面由于冷凝水滴的Wenzel态而失去了抗结霜性能，5 min内结霜覆盖率达到100%。然而，纳米结构表面的霜覆盖率在10分钟内仅达到4.6%，并在95分钟内达到完全覆盖。可以看出，超疏水表面的凝结水滴行为和抑霜性能对表面纳米结构更加敏感。然而，除霜过程对超疏水表面的纳米结构不够敏感。该标准为空气源热泵翅片防霜超疏水表面的简单制备提供了思路。
In order to study the effect of nanostructures on micro-nano structures on the frost suppression and defrosting performance of the superhydrophobic fin surface of the heat pump, a simple spray method was used to prepare the surfaces with the same static contact angle and rolling angle but different micro-nano structures. The research shows that the frost inhibition ability of superhydrophobic surface can be effectively improved with the increase of the density of nanostructures. In the condensation process, compared with the surface of micro-nano structure with low density nanostructures, the condensed droplets on the surface of high-density nanostructures have the characteristics of high renewal rate, small average size and low coverage. When condensing for 32 min, the number of condensation droplets merging, bouncing and sliding on the surface of nanostructure is 47.5% higher than that on the surface of micro-nano structure, and the area coverage of droplets is 25.46% lower than that on the surface of micro-nano structure. In the frosting experiment, superhydrophobic surface with the micro-nano structure lost its anti-frosting performance due to the Wenzel-state of condensate droplets, and the frost coverage rate reached 100% within 5 min. However, the frost coverage rate of the nanostructured surface only reached 4.6% in 10 min and reached full coverage in 95 min. It can be seen that the condensate droplet behaviors and frost suppression performance of the superhydrophobic surface are more sensitive to the surface nanostructure. However, the defrosting process is not sensitive enough to the nanostructures of the superhydrophobic surface. This standard provides the idea for the simple preparation of anti-frost superhydrophobic surface on the air-source heat pump fins.