【摘要】 翅片表面的凝结和排水影响翅片管换热器的换热过程，进而影响空气源热泵的能效。将裸铜亲水表面(BCS)、疏水铜表面(HCS)和超疏水铜表面(SHCS)相对竖直放置以模拟翅片排列，构成五种不同的润湿性组合。分别为组合1:HCS-BCS、组合2:BCS-SHCS、组合3:HCS-SHCS、组合4:HCS-HCS和组合5:SHCS-SHCS。实验结果表明，抑制大尺寸的液膜和液滴或利用表面间的润湿性差异引起的“吸收”现象是减少表面间液桥形成的重要途径。润湿性差异越大，“吸收”现象越明显。组合2、组合3和组合5在间距为2.0 mm时均未形成液桥。组合2仅需对一半数量的翅片改性，降低了翅片改性的成本。间距为1.0 mm时，与组合1相比，含有SHCS的组合3和组合5首次形成液桥的时间分别推迟了47 min和68 min,依然具有良好的抑制液桥的效果。更多还原

【Abstract】 Condensation and drainage on the fin surfaces affect the heat transfer process of the finned tube heat exchanger, which in turn affects the energy efficiency of the air source heat pumps. A bare copper hydrophilic surface(BCS), a hydrophobic copper surface(HCS) and a superhydrophobic copper surface(SHCS) were placed vertically at intervals to simulate the fin arrangement, constituting five different wettability combinations. Combination 1: HCS-BCS, Combination 2: BCS-SHCS,Combination 3: HCS-SHCS, Combination 4: HCS-HCS and Combination 5: SHCS-SHCS, respectively. The results of experiments illustrated that inhibiting the formation of large liquid films and droplets or utilizing the “absorption” phenomenon caused by wettability differences between surfaces is an important way to reduce the formation of liquid bridges between surfaces. The greater the wettability difference, the more obvious the “absorption” phenomenon. No liquid bridge was formed in Combination 2, Combination 3 and Combination 5 when the fin spacing was 2.0 mm. Combination2 requires modification of only half the number of fins, reducing the cost of fin modification. At a spacing of 1.0 mm, compared with Combination 1, the first liquid bridge formation time of Combination 3 and Combination 5 containing SHCS was delayed by 47 min and 68 min, respectively,which still had a good effect in inhibiting liquid bridges.更多还原