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制备了具有微纳复合结构,表面接触角和滚动角分别为159.7°和4.2°的超疏水翅片。通过可视化观测,揭示了超疏水翅片表面的抑霜机理和融霜特性,并与亲水翅片进行了对比。结霜初期,超疏水翅片表面的凝结液滴分布稀疏,呈Cassie状态;亲水翅片表面的凝结液滴分布密集,呈铺展状态,几乎覆盖整个翅片表面。超疏水翅片表面与霜层间实际接触面积小,换热热阻大,使其被霜层覆盖后仍可有效抑制霜层生长。融霜时,超疏水表面的弱黏附性导致霜层整体从翅片表面剥离和脱落,缩短了融霜时间,减少了滞留水量。
A superhydrophobic fin with micro-nano composite structure, surface contact angle and roll angle of 159.7 ° and 4.2 °, respectively, was prepared. Through visual observation, the mechanism of defrosting and defrosting of superhydrophobic fin surface were revealed and compared with hydrophilic fin. In the early stage of frosting, the condensed droplets on the surface of superhydrophobic fins are sparsely distributed and in the Cassie state. The condensation droplets on the surface of the hydrophilic fins are densely distributed and spread out and cover almost the entire surface of the fin. The actual contact area between superhydrophobic fin surface and frost is small, and the thermal resistance of the super heat-exchange fin is large, which can effectively restrain the frost layer growth even after it is covered by the frost layer. Defrost, the weak adhesion of the superhydrophobic surface causes the entire frost layer to peel and peel off from the fin surface, shortening the defrost time and reducing the amount of retained water.