东南大学 能源与环境学院,南京,211189
朱逸峰(1999—),男,江苏张家港人,硕士研究生,研究方向:微尺度传热传质. E-mail:220210536@seu.edu.cn
邓梓龙*,副教授,研究方向:多相流动与传热传质、相变强化传热. E-mail:zldeng@seu.edu.cn
纸质出版:2024
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朱逸峰, 林晨阳, 高尚文, 等. 超疏水空心方柱阵列表面抑霜特性实验研究[J]. 空气动力学学报, 2024, 42(12): 44−54.
ZHU Yifeng, LIN Chenyang, GAO Shangwen, et al. Experimental study on the defrosting performance of super-hydrophobic hollow square column array surface[J]. 2024, 42(12): 44-54.
朱逸峰, 林晨阳, 高尚文, 等. 超疏水空心方柱阵列表面抑霜特性实验研究[J]. 空气动力学学报, 2024, 42(12): 44−54. DOI: 10.7638/kqdlxxb-2024.0005
ZHU Yifeng, LIN Chenyang, GAO Shangwen, et al. Experimental study on the defrosting performance of super-hydrophobic hollow square column array surface[J]. 2024, 42(12): 44-54. DOI: 10.7638/kqdlxxb-2024.0005.
当前关于抑霜微纳结构制备超疏水表面的研究大多集中在水平角度的结霜过程,为了更深入研究竖直壁面上小尺度特殊异构表面的结霜、融霜特性,采用增材制造法制备小尺度空心方柱阵列,利用碱性辅助氧化法在表面进一步建立纳米草修饰以获得分级微纳结构,并通过氟化处理获得超疏水表面。为了评估分级结构的抑霜性能,搭建了可视化实验平台对结霜、融霜过程进行监测,引入霜层覆盖率、初霜时间、满霜时间等核心评价指标,设置亲水平板表面、超疏水平板表面两个对照组,定量比较分析了三者在结霜和融霜过程中的表现。实验结果表明:超疏水空心方柱阵列表面霜层生长和消融均从四周向中心发展,且融霜时则伴有整体脱落;其满霜时间比超疏水平板表面延长32.5%,霜层的完全融化排干时间比超疏水平板表面提早了25%。这说明具备多层分级结构的超疏水空心方柱阵列表面,通过其独特的冷凝液滴分布调控机制,有效限制了冷凝液滴的分布位置及霜层的生长范围,显著提升了抑霜性能,并加快了融霜阶段的融化速率和排液速度。
Currently
most research on the preparation of superhydrophobic surfaces with anti-frosting micro-nano structures focuses on the frosting process at horizontal angles. To further investigate the frosting and defrosting characteristics of small-scale special heterogeneous surfaces on vertical walls
this study presents a super-hydrophobic surface featuring a hierarchical micro-nano hollow square column array (HSCA)
designed for passive defrosting control through additive manufacturing. In order to gain a comprehensive understanding of the frost formation process and assess the defrosting performance of this HSCA surface
a visualization system was developed to facilitate an experimental investigation into the frost formation and melting processes
focusing on metrics such as frost coverage
initial and full frost time instants
and surface heat flux. The experimental results reveal that
in comparison to hydrophilic and super-hydrophobic flat surfaces
the hierarchical micro-nano structures make the condensation nucleation of humid air occur further away from the surface
particularly around the tops of the square columns. The experimental results show that frost growth and thawing on the superhydrophobic hollow square pillar array progress from the periphery to the center
with complete frost detachment occurring during thawing. The time to reach full frost coverage is 32.5% longer than on the superhydrophobic flat surface
while the time for complete frost melting and draining is 25% shorter. The hierarchical micro-nano structures cause the condensation nucleation of humid air to occur further from the surface
particularly around the tops of the square pillars. This unique behavior effectively hinders the spread of freezing waves and slows the growth of the frost layer
resulting in a discretely distributed frost layer on the hierarchical structure's surface. Consequently
the superhydrophobic surface significantly improves anti-frost performance and accelerates the rates of melting and discharge during the frost melting stage.
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