Condensed droplet growth on surfaces with various wettability

Condensed droplet growth on surfaces with various wettability
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不同润湿性表面上的凝结液滴生长

DOI:
10.1016/j.applthermaleng.2017.01.060
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发表时间:
2017-03
影响因子:
6.4
通讯作者:
Ma Qiang
Ma Qiang
中科院分区:
工程技术2区
文献类型:
--
作者:
Chu Fuqiang;Wu Xiaomin;Ma Qiang

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液滴冷凝比膜冷凝具有更好的传热性能,提高了各种工程应用的效率。由于表面润湿性决定了冷凝液滴的行为,进而决定了冷凝性能,因此需要了解表面润湿性对液滴生长的影响。在本研究中,制备了四个表面,包括一个亲水表面(表面 A)、两个疏水表面(表面 B 和 C)和一个超疏水表面(表面 D),并研究了液滴行为和液滴生长特性。结果表明,液滴在A面上具有非圆形三重线和非光滑聚结; B 表面上的液滴聚结更加平滑,但仍然不动; C表面上的大部分聚结体是不动的,但偶尔会发生自驱动液滴运动; D表面是超疏水表面,自驱动液滴运动频繁发生。这些不同的液滴行为极大地影响了各种表面上的液滴生长。一般来说,表面接触角越大,液滴生长越慢,表面覆盖率越低,液滴尺寸的相对标准偏差越大。然而,在超疏水表面D上,频繁的自驱动液滴运动扰乱了正常的液滴生长,导致不可预测的液滴生长特性。
Droplet condensation, which has better heat transfer performance than film condensation, improves the efficiency of various engineering applications. Since the surface wettability decides the condensed droplet behavior, which then decides the condensation performance, the influence of the surface wettability on the droplet growth needs to be understood. In this study, four surfaces were prepared including a hydrophilic surface (surface A), two hydrophobic surfaces (surface B and C) and a superhydrophobic surface (surface D) with the droplet behavior and the droplet growth properties investigated. The results show that the droplets have non-circular triple lines and non-smooth coalescences on surface A; the droplet coalescence on surface B is smoother but still immobile; most coalescences on surface C are immobile, but the self-propelled droplet motion occurs occasionally; surface D is a superhydrophobic surface, where the self-propelled droplet motion occurs frequently. These different droplet behaviors greatly influence the droplet growth on various surfaces. Generally, with larger surface contact angle, the droplet grows more slowly, the surface coverage fraction is lower, the relative standard deviation of droplet sizes is larger. However, on the superhydrophobic surface D, the frequent self-propelled droplet motion disturbs the normal droplet growth, resulting in unpredictable droplet growth properties.
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