Investigation of Dropwise Condensation Heat Transfer on Laser-Ablated Superhydrophobic/Hydrophilic Hybrid Copper Surfaces.
Investigation of Dropwise Condensation Heat Transfer on Laser-Ablated Superhydrophobic/Hydrophilic Hybrid Copper Surfaces.
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DOI：
10.1021/acsomega.0c01995
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发表时间：
2020-09-22
期刊：
影响因子：
4.1
通讯作者：
Chen X
中科院分区：
文献类型：
--
作者：
Song Z;Lu M;Chen X
具有润湿反差的非均匀表面由于其在强化凝结换热方面的潜在应用，近年来受到了广泛的关注。在这项工作中，我们设计了超疏水/亲水混合（SHH）表面上的铜基板通过激光烧蚀过程。我们证明了所制造的SHH表面呈现滴状冷凝行为;冷凝液滴的生长、偏离和传热性能强烈依赖于亲水点的间距。与均匀超疏水（SHPo）表面相比，亲水点间距为100 μm（SHH 100）的表面在快速液滴生长速率、有效的聚结诱导液滴脱离以及增强的传热系数（HTC）方面表现出最有效的滴状冷凝。分析了强化冷凝传热的机理。与SHPo表面相比，SHH 100表面的冷凝HTC提高了12%。我们的研究结果提供了重要的见解，设计的混合表面与润湿对比，以提高冷凝传热性能，在许多工业应用。
Heterogeneous surfaces with wetting contrast have gained extensive attention in recent years because of their potential application in condensation heat transfer enhancement. In this work, we engineered superhydrophobic/hydrophilic hybrid (SHH) surfaces on copper substrates via a laser-ablation process. We demonstrated that the as-fabricated SHH surfaces present dropwise condensation behavior; the condensate droplet growth, departure, and heat transfer performance depend strongly on the spacing of the hydrophilic spot. The surface with the hydrophilic spot spacing of 100 μm (SHH100) exhibits the most efficient dropwise condensation in terms of fast droplet growth rate, efficient coalescence-induced droplet departure, as well as enhanced heat transfer coefficient (HTC) compared to the homogeneous superhydrophobic (SHPo) surface. The mechanism underlying the enhanced condensation heat transfer performance is analyzed. A 12% enhancement on condensation HTC was found was found on SHH100 surface compared with the SHPo surface. Our results provide important insights for the design of hybrid surfaces with wetting contrast for enhancing condensation heat transfer performance in many industrial applications.
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